Article
Nanoscience & Nanotechnology
Zhen Wei, Jinghuai Zhang, Rirong Bao, Ruizhi Wu, Hao Zhang
Summary: The strength of Mg-8.5Li-7.5Zn-1.5Y alloy is significantly enhanced through simple heat treatment. The yield strength increment of 173 MPa is rarely reported in Mg alloys. The formation of abundant needle-shaped α-Mg precipitates uniformly distributed in the β-Li matrix is mainly responsible for the remarkable improvement in yield strength. This new finding is expected to contribute to the design of high-performance Mg-Li alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xiaogang Fang, Dechao Wu, Jiguang Liu, Youwen Yang, Shulin Lv, Shusen Wu, Yiqing Chen
Summary: The effects of high pressure during the RSC process on the microstructure and corrosion resistance of Mg90.8Zn8.6Y0.6 alloy were studied. Increasing pressure resulted in a decrease in the size of α-Mg grains and the lamellar spacing of in-situ formed quasicrystal phase (I-Mg3Zn6Y). The high pressure also increased the supersaturation of Zn in the matrix, reduced the volume fraction of second phases, and eliminated the Mg7Zn3 phase. Furthermore, the corrosion resistance was improved, and the corrosion process changed from three stages to two stages due to the effects of high pressure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Alok Singh, Takanobu Hiroto, Machiko Ode, Hiroyuki Takakura, Karel Tesar, Hidetoshi Somekawa, Toru Hara
Summary: The precipitation of a stable quasicrystalline i-phase has been observed in a Mg-6Zn-3Al magnesium alloy, which may be the first discovery of a stable i-phase in this alloy. The dissolution of i-phase at grain boundaries leads to precipitation in the Mg-matrix during cooling. Nucleation characteristics, phase transformation, and interface morphology were investigated.
Article
Materials Science, Multidisciplinary
Jianqiang Hao, Jinshan Zhang, Hongxia Wang, Weili Cheng, Boqiong Li, Yang Bai
Summary: The effect of solid-solution treatment on the microstructure and mechanical properties of Mg93.5Zn2.5Y2.5Mn1Ti0.5 alloys was investigated. The results showed that solid-solution treatment transformed the fishbone-like W phase into spherical W phase and the bulk 18R LPSO phase along grain boundaries into intragranular lamellar 14H LPSO phase. The spheroidization of W phase and the formation of intragranular 14H LPSO phase effectively improved the mechanical properties of the alloys. The alloys subjected to 40 hours of solid-solution treatment exhibited the greatest improvement in mechanical properties, including yield strength, tensile strength, and elongation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Metallurgy & Metallurgical Engineering
V. E. Bazhenov, A. Koltygin, M. C. Sung, S. H. Park, Yu Tselovalnik, A. A. Stepashkin, A. A. Rizhsky, M. Belov, V. D. Belov, K. Malyutin
Summary: Magnesium alloys are commonly used in aircraft for their lightweight properties. In this study, high-potential Mg-Zn-Y-Zr alloys were selected and tested for their performance, with the Mg-4 wt% Zn-3 wt% Y-0.3 wt% Zr alloy showing high thermal conductivity and satisfactory mechanical properties. The alloy demonstrated a room temperature thermal conductivity of 105 W/mK and an increase in elongation can be achieved through heat treatment.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Chemistry, Physical
A. P. Babu, M. C. Lam, J. Ma, A. Huang, N. Birbilis
Summary: In this study, a high solute 7xxx series aluminium alloy Al-14Zn-3Mg was prepared using laser powder bed fusion. It was found that the formation of T-phase at 400 degrees C led to a loss of ductility, whereas the improvement in hardness was attributed to the formation of eta' and eta precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Guangli Bi, Hongsheng Man, Jing Jiang, Yuandong Li, Tijun Chen, Xiaoru Zhang, Daqing Fang, Xiangdong Ding
Summary: The effects of Zn addition on the microstructure and mechanical properties of Mg-Y-Co-W alloy were investigated. The replacement of Co with Zn improved the strength and ductility of the alloy, resulting in refined grains and precipitation strengthening from different phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Metallurgy & Metallurgical Engineering
Jie LI, Lei Shi, Yi-nan LI, Tao-shuai Zhou, Zi-jing Yu, Hong-chang Zhang, Zi-long Peng, Shu-wen Miao, Jian-guo Gao, Zhao-fang Su
Summary: The evolution of microstructure in the MB8/2024 dissimilar alloy joints with Al/Zn/Cu/Zn multi-interlayers by ultrasonic-assisted brazing was studied. The addition of aluminum foil on the MB8 side resulted in the transformation of Al3Mg2 binary intermetallic compounds (IMCs) into AlMg4Zn11 ternary IMCs along the copper foil-MB8 magnesium alloy interface. This transformation enhanced the joints, with the shear strength reaching a maximum at 22 s (85.26 MPa). The cavitation effect in ultrasonic-assisted brazing led to the discovery of Mg32(Al,Zn)49 quasicrystal.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Materials Science, Multidisciplinary
Qiyu Liao, Wenxin Hu, Ruming Chen, Qichi Le
Summary: The precipitation behavior and dynamic recrystallization (DRX) behavior of Mg-Zn-Y alloys were systematically investigated in this work. The results showed that the LSPO phases significantly affected the grain size and strength of the alloy, and the Mg97.5Zn1Y1.5 alloy exhibited good heat resistance and mechanical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Zhibing Ding, Xuanle Zhi, Bin Liu, Hua Hou, Shuai Zhang, Wenmin Guo, Dongrui Chen, Yuhong Zhao
Summary: The effect of Sn addition on the microstructure and mechanical properties of Mg-12Gd-3Y-0.5Zn-0.6Zr alloys was investigated. The addition of Sn increased the number and high temperature stability of Sn3RE5 phases, resulting in an increased elastic modulus of the alloys. It also significantly increased the number of fine circular beta' phases in peak-aged alloys. Suitable addition of Sn endowed the Mg-12Gd-3Y-0.5Zn-0.6Zr-1Sn alloy with excellent comprehensive performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Cong Dang, Xiaoxu Dou, Jingfeng Wang, Di Yu, Jinxing Wang, Ruopeng Lu, Hua Hou, Yuhong Zhao
Summary: Different solution treatments at different temperatures were conducted on the Mg-9.55Gd-2.27Y-1.28Zn-0.55Zr-0.11Nd alloy, resulting in different phase constitutions. The Mg3RE-type eutectic phases transformed into long period stacking order (LPSO) phases with various morphologies after solution treatment. Increasing the solution temperature led to larger grain size, more lamellar LPSO phases, and segregation of Zr element. The special spatial structure consisting of prismatic b' precipitates, basal g' precipitates, and lamellar LPSO phases hindered dislocation movement effectively, leading to high strength, but also caused premature cracking and decreased ductility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Xiaojie Zhou, Wenying Xiong, Gang Zeng, Hongchao Xiao, Jian Zhang, Xianzheng Lu, Xiaomin Chen
Summary: The combined effects of LPSO orientation and alpha-Mg texture on tensile anisotropy were investigated, with the extrusion direction showing optimal mechanical properties, the 45 degrees direction exhibiting high elongation, and the transverse direction having inferior strength and elongation simultaneously. LPSO orientation contributes to strength anisotropy through different load-bearing strengthening effects along different tensile axes, while alpha-Mg texture contributes to strength anisotropy through stronger grain boundary strengthening effects. However, LPSO orientation, rather than alpha-Mg texture, accounts for ductility anisotropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Huanjian Xie, Zili Liu, Xiqin Liu, Fang Liu, Pingze Zhang, Jian Li
Summary: A new hexagonal phase AlZnY was discovered in the Mg-4Y-Al-3Zn alloy for the first time in this study, and its deformation behavior and hardness were evaluated, providing new data for the study of the Mg-Y-Al-Zn alloy system.
Article
Materials Science, Multidisciplinary
Guangli Bi, Maocao Le, Jing Jiang, Baiyu Li, Yuandong Li, Tijun Chen, Ying Ma
Summary: This study investigates the microstructure evolution, mechanical properties, and degradation behavior of a rapidly degradable extruded Mg-2Y-0.5Zn-0.5Ni (at%) alloy for fracturing tool applications. The extruded alloy exhibits a microstructure mainly composed of a recrystallization region and a nonrecrystallization region with the presence of 18R-LPSO phase with two morphologies along the extrusion direction. The alloy shows improved mechanical properties compared to the as-cast alloy, attributed to grain refinement, LPSO phase strengthening, and texture strengthening. Importantly, the extruded alloy has a high degradation rate due to microgalvanic corrosion between the LPSO phase and the alpha-Mg matrix, as confirmed by immersion and electrochemical tests.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Feng Han, Hua Han, Yu Zhang, Tao Yuan, Caimei Wang
Summary: This study reveals the formation mechanism of the quaternary quasicrystal phase in the Al-Cu-Mg-Zn alloy resistance spot welding nugget. The quasicrystal phase is located at the inner-dendrite zone and exhibits the typical pattern of an icosahedral quasicrystal. It is found that the undercooled remnant liquid forms the icosahedral quasicrystal phase due to the rapid cooling rate of resistance spot welding. This study demonstrates the feasibility of acquiring a massive quasicrystal phase in commercially-used aluminum alloy under common processing conditions.
Article
Materials Science, Multidisciplinary
Yun Feng, Yuanyuan Yang, Zongqi Xiao, Xianglong Meng, Guorong Zhou, Jinfeng Leng, Xinying Teng
Summary: The influence of aluminum on the mechanical properties and microstructure of Mg-Sn-Ca-Mn alloys was systematically investigated, and the addition of 1.5 wt% Al significantly increased the yield strength of the alloy. The extruded alloy exhibited a bimodal grain structure with dynamic recrystallized fine grains and coarse unrecrystallized grains. Additionally, the alloy with 1.5 wt% Al showed a significant enhancement in fiber texture.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Shuai Dai, Huawei Zhang, Zeyu Bian, Jiwei Geng, Zhe Chen, Lei Wang, Mingliang Wang, Haowei Wang
Summary: The study provides insights into the recrystallized behavior and precipitation reaction of the in-situ nano TiB2/Al-Cu-Mg composite during heat treatment. Coefficient thermal expansion difference between TiB2 particles and Al matrix promotes the recrystallized behavior, while the strong pinning effect at recrystallized grain boundary induced by TiB2 is observed. The study also highlights the enhancement of precipitation kinetics by trace Mg and the continuous transformation of theta '' into theta' via atomic Cu rearrangement.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Hongyu Xiao, Jiwei Geng, Yugang Li, Zhiping Wang, Qing Yang, Hongping Li, Mingliang Wang, Dong Chen, Zhuguo Li, Haowei Wang
Summary: The precipitation behaviors and mechanical properties of the slowly-quenched 7085Al alloy after various aging treatments were investigated. The double-step aging treatment resulted in finer precipitates and higher number density compared to the single-step treatment, while the precipitate free zones narrowed. A novel heterogeneous nucleation of eta' phase on lath-shaped S phase was identified in this study.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
Zhanbai Feng, Wang Gui, Hideo Kimura, Yuping Zhang, Tianhao Zhou, Dehan Li, Chaoqun Yang, Xinying Teng, Haitao Wu
Summary: The sintering behavior and microwave dielectric properties of Cu-3(PO4)(2) ceramic were investigated. Dense Cu-3(PO4)(2) ceramic with low permittivity and low loss was obtained at 900 degrees C for 2 hours.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Jiwei Geng, Yugang Li, Feifei Wang, Chengcheng Zhang, Dong Chen, Mingliang Wang, Haowei Wang
Summary: This study quantitatively investigated the complex effects of reinforcements on the fatigue crack growth behavior in a wrought Al matrix composite by hierarchical characterizations considering particle bands. The results indicate that the crack growth mechanisms of the composite are influenced not only by the matrix microstructures but also by the TiB2 particles. The blocking effect of TiB2 particles on fatigue crack growth was found to be experimentally dependent on the particle band width. In-situ observations and microstructural evolutions near the fracture surface were discussed in relation to the fatigue crack growth mechanisms in the composite.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Hongyu Xiao, Zhiping Wang, Jiwei Geng, Chengcheng Zhang, Yugang Li, Qing Yang, Mingliang Wang, Dong Chen, Zhuguo Li, Haowei Wang
Summary: This study investigated the precipitation and crystallographic relationships between the quench-induced S phase and Al matrix in an Al-Zn-Mg-Cu alloy using scanning transmission electron microscopy and scanning precession electron diffraction. It was found that higher lattice strain energy led to Zn segregation at the S-Al interfaces and the heterogeneous nucleation of nanosized eta' precipitates. The crystallographic orientation relationships between the S phases and precipitates were reported and discussed for the first time in an Al-Zn-Mg-Cu alloy.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Ceramics
Zhanbai Feng, Yingzi Wang, Hideo Kimura, Xianglong Li, Yanbin Zhang, Yuping Zhang, Jialun Du, Xuan Yu, Xinying Teng, Haitao Wu
Summary: Ni3(PO4)2 ceramic was synthesized using the solid-state sintering method, and its sintering behavior and microwave dielectric properties were investigated. The results showed that Ni3(PO4)2 ceramic exhibited low loss and low permittivity, making it a promising candidate for microwave dielectric applications.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Zhanbai Feng, Lintao Liu, Kimura Hideo, Yuping Zhang, Lianwei Shan, Wu Haitao, Xinying Teng, Yue Zhenxing
Summary: A series of Ce-2[Zr1-x(Cr-1/Nb-2(1/2))x](3)(MoO4)(9) ceramics were synthesized and investigated for their sintering behaviors, phase compositions, and microwave dielectric properties. The results showed that the substitution of (Cr1/2Nb1/2)(4+) caused shrinkage and distortion of [ZrO6] octahedron. The analysis of chemical bond feature and infrared spectra revealed the inherent mechanism of the dielectric response. Ce-2[Zr-0.94(Cr1/2Nb1/2)(0.06)](3)(MoO4)(9) ceramic synthesized at 825°C for 6 h exhibited significant properties, indicating the effectiveness of (Cr1/2Nb1/2)(4+) substitution in optimizing microwave dielectric materials.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zhiping Wang, Hongyu Xiao, Wei Chen, Yugang Li, Jiwei Geng, Xianfeng Li, Peikang Xia, Mingliang Wang, Dong Chen, Haowei Wang
Summary: The influence of temperature of first-step pretreatment on the precipitation and crystal structure of Al3Zr in a spray-formed Al-Zn-Mg-Cu alloy was systematically studied. The results show that the temperature of first-step pretreatment is crucial for stabilizing microstructures, and an optimized pretreatment can significantly enhance the recrystallization resistance during solution treatment.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Zhiping Wang, Jiwei Geng, Peikang Xia, Yugang Li, Wei Chen, Xianfeng Li, Mingliang Wang, Dong Chen, Haowei Wang
Summary: Phase transformation during annealing in rapidly-solidified Al-Zn-Mg-Cu alloy was investigated. The primary eta-Mg(Zn,Al,Cu)2 phase was formed during spray forming, but decomposed as newly-oriented nano eta phase particles at eta/Al interface and directly transformed to S-(Al2CuMg) phase during annealing. The impact toughness of Al-Zn-Mg-Cu alloy was significantly deteriorated due to the phase transformation, which provides new insights for toughness enhancement in Al-Zn-Mg-Cu alloys.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Zhiping Wang, Qingqing Pu, Yugang Li, Peikang Xia, Jiwei Geng, Xianfeng Li, Mingliang Wang, Dong Chen, Haowei Wang
Summary: The effects of combined Ti and Zr addition on the microstructures and mechanical properties of Al-Zn-Mg-Cu alloy were investigated. The results show that the addition of Ti and Zr promotes the precipitation of nano L12 Al3(Ti,Zr) dispersoids. However, the presence of primary D022 Al3Ti and Al3(Ti,Zr) phases reduces both the strength and ductility. The addition of minor Ti and Zr elements provides a simple approach to improve toughness and reduce cost in developing high-strength Al alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Jiwei Geng, Yugang Li, Feifei Wang, Zhiping Wang, Peikang Xia, Xianfeng Li, Dong Chen, Mingliang Wang, Haowei Wang
Summary: Cyclic deformation of an Al-Cu-Mg composite strengthened by small non-shareable particles was investigated using strain controlled low-cycle fatigue tests. The in-situ TiB2/Al-Cu-Mg composite showed higher fatigue life compared to reported composites. The cyclic hardening response was attributed to non-shareable particles, dislocations, and dynamically deformation-induced short-range orderings. The cyclic hardening model, considering plastic strain evolution, was well fitted with experimental results. The onset of stress serration was found to be dependent on strain amplitude rather than cumulative plastic strain.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Physical
Xinbo Ni, Fangcheng Zheng, Xinying Teng, Kesong Miao, Rengeng Li, Chenglu Liu, Xuewen Li, Chang Zhou, Hao Wu, Guohua Fan
Summary: Layer thickness is a crucial parameter for determining the mechanical properties of multi-layered composites. Recent observations have shown that increasing the thickness of Ti layers in Ti/Al layered materials leads to synchronous improvement in strength and ductility. A combination of synchrotron X-ray microdiffraction and electron backscatter diffraction techniques was used to study the behavior of dislocations at different deformation stages. A mechanistic model was developed to explain the influence of layer thickness and determine the threshold thickness that governs the transition of deformation and fracture behaviors. The findings from our experimental and modeling efforts highlight the role of layer thickness in dislocation dynamics and strain distribution, providing insights for designing next-generation high-performance layered composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zhiping Wang, Hongyu Xiao, Wei Chen, Yugang Li, Jiwei Geng, Keneng Li, Peikang Xia, Mingliang Wang, Xianfeng Li, Dong Chen, Haowei Wang
Summary: The dependence of grain boundary structure on precipitation at grain boundaries (GBs) in a TiB2/Al-Zn-Mg-Cu composite has been systematically investigated. It was found that the average size and coverage of grain boundary precipitates (GBPs) increase while the number density decreases with the increasing misorientation of low angle GBs (LAGBs). For high angle GBs (HAGBs), the coincidence site lattice (CSL) GBs and TiB2 particles have an effect on GBPs. The results indicate that TiB2 particles promote the nucleation of GBPs while limiting their growth.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Coatings & Films
Yugang Li, Jiwei Geng, Zhiping Wang, Zhaoyu Shao, Chengcheng Zhang, Dong Chen, Haowei Wang
Summary: Residual stresses and strain hardening in GH4169 Ni-based superalloy were studied using four different laser shock peening (LSP) configurations and two vacuum annealing conditions. X-ray diffraction (XRD) and uniaxial progressive loading tests were used for investigation. The results showed limited thermal relaxation of residual stress and an abnormal elevation of strain hardening under certain vacuum annealing conditions. The relationship between strain hardening and XRD peak width can be used for quantitative analysis of strain hardening in GH4169 Ni-based superalloy treated by other cold working processes below 650 degrees C.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Physics, Condensed Matter
A. Jbeli, N. Zeiri, N. Yahyaoui, P. Baser, M. Said
Summary: The electronic and optical properties of CdSe/ZnSe semiconductor core/shell quantum dots with hydrogenic donor impurity were investigated theoretically. The perturbation and variational methods were used to calculate the binding energy, photoionization cross-section, polarizability, and diamagnetic susceptibility of the excited impurity under various conditions. A significant stark shift in the binding energy was observed under the influence of an external electric field.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Rahat Batool, Tariq Mahmood, Sajid Mahmood, Abdul Aziz Bhatti
Summary: This study investigates the effects of alkali metal doping (Na, K, Cs) on MAPbI3 through compositional engineering. The results show that doping Na, K, and Cs can improve the phase stability, thermodynamic stability, and optical absorption of MAPbI3.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
N. A. N. M. Nor, M. A. H. Razali, W. H. A. W. K. Annuar, N. N. Alam, F. N. Sazman, N. H. M. Zaki, A. S. Kamisan, A. I. Kamisan, M. H. Samat, A. M. M. Ali, O. H. Hassan, B. U. Haq, M. Z. A. Yahya, M. F. M. Taib
Summary: This study investigates the potential of quaternary chalcogenides semiconductors as thin film solar cell absorbers using density functional theory (DFT) and density functional theory plus Hubbard U (DFT + U) approach. The results show that by applying Hubbard U terms, the electronic band gaps can be accurately predicted, providing valuable insights for finding cost-effective new thin film solar cell materials.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Ashwani Kumar, Anuj Kumar, Mohaseen S. Tamboli, Mohd Ubaidullah, J. Jayarubi, S. K. Tripathi
Summary: In this study, lead-based perovskite solar cells are replaced by bismuth-based perovskite cells to overcome their instability and toxicity. CsBi3I10 perovskite films are fabricated using a modified drop-casting process, and the effects of post-annealing temperature on the morphological, structural, and optical properties are investigated. The photovoltaic performance of the cells without a hole transport layer is also quantitatively evaluated.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yang Gao, Shu-Ming Chen, Shuo Cao, Shang-Zhou Zhang, Philippe Djemia, Qing-Miao Hu
Summary: This study investigates the phase stability, elastic modulus, and hardness of ternary nitride Ti1-xAlxN. It is found that the hardness increases with the Al content x. The cubic B1 structure is more stable for x < about 0.75, while the hexagonal structure (B4) is more stable for x > about 0.75. The composition dependent hardness and phase decomposition contribute to the convex shaped hardness curve of Ti1-xAlxN.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Fengqi Wang, Qinyan Ye, Xulin He, Kun Luo, Xiaolong Ran, Xingping Zheng, Cheng Liao, Ru Li
Summary: This report uses rigorous calculations based on density functional theory to study the piezoelectric and elastic properties of wurtzite aluminum nitride (w-AlN) with single- and co-alloying by Hf (or Zr) and Sc. The research finds that the (HfSc)0.375Al0.625N and (ZrSc)0.375Al0.625N with stable wurtzite phase have a large piezoelectric coefficient d33 of 49.18 pC/N and 47.00 pC/N, respectively. However, the piezoelectric voltage constant g33 and electromechanical coupling constant k233 of HfAlN, ZrAlN, HfScAlN, and ZrScAlN are smaller than that of ScAlN, which is attributed to the large dielectric constant epsilon 33 of Hf (or Zr) alloying samples. Furthermore, the calculations of internal parameter u and bond angle alpha elucidate the brittle-to-ductile transformation in alloying w-AlN crystal structure. Electronic structure calculations show that the bandgap decreases almost linearly with the increase of alloying concentration, and the Hf (or Zr) alloying compounds become n-type semiconductors due to the existing high-charge states.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
S. R. Athul, K. Arun, S. Swathi, U. D. Remya, Andrea Dzubinska, Marian Reiffers, Nagalakshmi Ramamoorthi
Summary: The magnetic and magnetocaloric characteristics of Ho6FeSb2 have been studied. The compound exhibits two second-order ferromagnetic transitions, enabling hysteresis-free magnetocaloric effect across a wide temperature range. The alloy has high relative cooling power and magnetoresistance, making it suitable for hysteresis-free magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Reena Sharma, Neelam Hooda, Ashima Hooda, Satish Khasa
Summary: A polycrystalline double perovskite La2CoMnO6 sample was prepared and its structural, dielectric and magnetic properties were investigated. The sample exhibited complex structures and magnetic behavior, and showed good conductivity and dielectric performance. Its multi-domain magnetic structure suggests its suitability for memory device applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Shubha Dubey, Jisha A. Abraham, Kumud Dubey, Vineet Sahu, Anchit Modi, G. Pagare, N. K. Gaur
Summary: This study investigates the optoelectronic, thermodynamic, thermoelectric, and mechanical stability properties of RhTiP Half Heusler semiconductors. The results show that RhTiP is a non-magnetic material with confirmed mechanical stability. It is found to be an indirect-bandgap semiconductor with a good Seebeck coefficient. This study suggests that RhTiP has promising applications in the thermoelectric and optoelectronic fields.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Xun Xie, Jiong-Ju Hao, Hong-Wei Yang
Summary: This work presents a multilayer film structure that uses optical resonance to prepare highly efficient and saturated red, green, and blue transmittance colors. Numerical simulations and analysis show that the structure can produce R, G, and B colors with a purity comparable to standard RGB colors, while maintaining efficient transmission efficiency and obtaining a rich variety of structural colors. Additionally, a metallic interlayer is introduced to selectively suppress resonances in the short-wavelength region, improving the purity of the red color. The study also investigates the effect of the incidence angle on color purity and transmission efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yueqiang Zhao
Summary: Solubility property is of great interest in chemical, physical, pharmaceutical, material, and environmental sciences. Understanding the intrinsic reason behind solubility behavior is a fascinating task. The theoretical relation between binary mutual solubility and liquid-liquid interfacial tension has been derived, where the partitioning of solute molecules between two coexisting liquid phases is determined by the transfer free energy per unit segment for a chain-like solute molecule expressed in terms of solute-solvent interfacial tension. This general theory of solubility is in good agreement with experimental results for binary mutual solubility and molar transfer free energy of solute molecules.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Osama K. M. Bashiar, R. E. Kroon, H. C. Swart, R. A. Harris
Summary: ZnO thin films with near-infrared emission were successfully fabricated using pulsed laser deposition under vacuum conditions, without the need for additional gases or implantation methods. The NIR emission was hypothesized to be caused by defects in the ZnO film due to high energy particle impacts on the sample surface.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
O. Stognei, A. Berezutskii, I. Anisimov, A. Deryabin
Summary: The influence of ZrOn matrix stoichiometry on the electrical and magnetoresistive properties of Fe-Zr-O nanocomposites has been studied. It was found that the magnetoresistive effect is not observed in composites with oxygen lack, while composites with oxygen excess show magnetoresistive effect and increased resistivity. Magnetoresistivity in composites with oxygen lack only appears after heat treatment. These results can be explained by the difference in the density of localized states in the oxide matrix of the composites and the ratio between two types of conductivity.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Mehmet Bayirli, Aykut Ilgaz, Orhan Zeybek
Summary: The present study aims to understand the relationship between impedance characteristics and fractal behaviors. By producing neat and carbon nanotube doped composite specimens, the researchers investigated the electrical properties and surface heteromorphology using Nyquist plots and fractal analysis.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
M. I. Khan, Saddam Hussain, Muhamad Saleem, Fatimah Mohammed Alzahrani, Muhammad Siddique, M. S. Hassan, Allah Ditta Khalid, Munawar Iqbal
Summary: The sol-gel method was used to deposit Ti-doped MAPbBr3 films on FTO-glass substrates with different doping ratios (0%, 4%, and 6%). XRD analysis confirmed the cubic structure of all films, and the 4% Ti-doped film exhibited a large grain size, low band gap energy, and high refractive index. Solar cells fabricated using the 4% Ti-doped MAPbBr3 film showed improved performance in terms of current density, open circuit voltage, fill factor, and efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
