Article
Nanoscience & Nanotechnology
Anna Eftifeeva, Elena Panchenko, Eleonora Yanushonite, Irina Kurlevskaya, Ekaterina Timofeeva, Aida Tokhmetova, Nikita Surikov, Anton Tagiltsev, Yuriy Chumlyakov
Summary: The research paper discusses the impact of stress-induced martensite aging on the elastocaloric cooling capacity and superelasticity of Ni54Fe19Ga27 single crystals. The study shows that martensite aging enhances the superelasticity parameters and improves the performance of elastocaloric cooling systems. Additionally, martensite aging reduces stress hysteresis and energy dissipation, and exhibits high cyclic stability in a wide temperature range.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
F. Masdeu, J. Pons, J. Torrens-Serra, Y. Chumlyakov, E. Cesari
Summary: Ni51.5Fe21.5Ga27.0 single crystals were heat treated to obtain different degrees of L21 ordering. The mechanical behavior of the material in compression mode showed a strong dependence on axis orientation. Superelasticity was perfect in the [001] direction over a wide range of temperatures, while brittle fracture occurred in the [110] orientation above the austenite transformation finish temperature. The microstructure after mechanical tests revealed local microplastic deformation of the martensitic phase. The adiabatic cooling effect was characterized and found to be higher in the [110] orientation compared to the [001] orientation at 240 K.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Yurong Niu, Haiyang Chen, Xiangyu Zhang, Shengwei Li, Daoyong Cong, Tianyu Ma, Shilei Li, Junpin Lin, Yan-Dong Wang
Summary: In this study, excellent superelasticity and giant elastocaloric effect were demonstrated in a directionally solidified Co50.7V333Ga16 alloy, showing reversible compressive strain, narrow stress hysteresis, and a wide operating temperature window. The alloy also exhibited a large adiabatic temperature change and good functional stability over multiple cycles.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Nian-Hu Lu, Chih-Hsuan Chen
Summary: This study investigates the strain distribution and elastocaloric effect of a superelastic Cu-Al-Mn shape memory alloy during compression. The alloy exhibits low critical stress, narrow stress hysteresis, and excellent superelasticity. The strain field analysis reveals the presence of multiple variants and uneven strain distribution. The inhomogeneous transformation and differences between measured and theoretical elastocaloric effects are attributed to non-uniform and incomplete martensitic transformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Pengfei Dang, Lei Zhang, Yumei Zhou, Qingkai Liang, Xiangdong Ding, Jun Sun, Dezhen Xue
Summary: We report a nanostructured Ti49.2Ni44.8Co6 (at.%) alloy with fully recoverable tensile superelasticity (& SIM; 6%) and high critical stress (> 500 MPa) at low temperatures from -150 to -50 degrees C. The alloy exhibits a significant adiabatic temperature change of 10.7 K during fast unloading at -50 degrees C. This alloy outperforms most shape memory alloys in terms of low-temperature tensile superelastic stress and adiabatic temperature change, with negligible degradation during stress cycles. These favorable properties are attributed to the enhanced thermodynamic stability of the parent phase and the remarkable strengthening effect of the partially recrystallized nanocrystalline structure with dispersed Ti3Ni4 nanoprecipitates.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Yu Cheng, Yu -Yung Ting, Chih-Hsuan Chen
Summary: The Ti-rich Ti50.9Ni48.9Si0.2 ribbon produced by melt-spinning process exhibited excellent recoverable superelasticity and elastocaloric cooling performance, showing high functional stability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Dong Li, Zongbin Li, Xiaoliang Zhang, Cong Liu, Guoyao Zhang, Jiajing Yang, Bo Yang, Haile Yan, Daoyong Cong, Xiang Zhao, Liang Zuo
Summary: In this study, a strategy to achieve a giant elastocaloric response by enlarging the lattice volume change was presented, resulting in Ni-Cu-Mn-Ga alloys with tailored transformation entropy change. These alloys showed significantly large temperature changes of up to -23.5 and -19.3 K upon removing compressive stress, indicating potential for high-performance elastocaloric materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Hao-Chen Lee, Jia-Jyun Shen, Yen-Ting Chang, Cheng-Tien Wu, Chih-Hsuan Chen
Summary: The investigation showed that Ti49.2Ni49.3Fe1.5 alloy aged at 400 degrees C for 150 h exhibited the largest recoverable strain in superelasticity and retained the largest cooling effect after 1000 deformation cycles. The linear superelasticity exhibited a low slope of the Clausius-Clapeyron relation of about 0.5 MPa/degrees C, allowing the alloys to exhibit super-elasticity and the elastocaloric effect over a wider temperature range.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Zhongzheng Deng, Kai Huang, Hao Yin, Qingping Sun
Summary: We studied the temperature-dependent mechanical properties and elastocaloric effects of multiphase nanocrystalline NiTi alloys with different grain sizes. The alloys undergo thermally induced phase transitions and show complex deformation mechanisms and microstructure evolution. The mechanical properties and elastocaloric effects exhibit strong temperature dependencies. Among the alloys studied, the one with a grain size of 20 nm exhibits the best comprehensive cooling performances, with a wide refrigeration temperature window, considerable adiabatic temperature drops, and good functional stability. This work provides an experimental basis for the use of multiphase nanocrystalline NiTi alloys as solid-state refrigerants.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Ruihang Hou, Fei Xiao, Zhu Li, Xuejun Jin
Summary: The study investigates the effects of crystallographic texture on the superelasticity and elastocaloric effect of nanograin Ti-44Ni-5Cu-1Al rolled sheet. As the angle between tensile direction and rolling direction increases, the intergranular constraint effect reaches its maximum in the transverse direction, resulting in similar monotonic decreasing trends for transformation strain and adiabatic temperature change. In the rolling direction, the material coefficient of performance reaches 11.2.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Xiangyu Zhang, Haiyang Chen, Shengwei Li, Yurong Niu, Tao Yin, Chao Song, Runqiu Lang, Daoyong Cong, Shilei Li, Yan-Dong Wang
Summary: This study synthesized a Co-Ni-Ga alloy with remarkable mechanical properties and elastocaloric effect, and observed a significant improvement in its fatigue resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yu. I. Chumlyakov, I. V. Kireeva, Z. V. Pobedennaya, I. V. Kuksgauzen, A. V. Vyrodova, D. A. Kuksgauzen, L. P. Yakovleva
Summary: The effect of ageing conditions on stress-induced BCC-FCC martensitic transformation and superelasticity in FeMnAlNi single crystals was studied. It was found that the precipitation of nanosized particles increases the stress level for the onset of the transformation and leads to the creation of high-temperature superelastic crystals. Wide ranges of superelasticity temperatures were observed after ageing, and a two-stage superelasticity curve was observed after ageing in martensite under stress.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Materials Science, Multidisciplinary
Xuefei Tao, Yang Yang, Hongxiang Zong, Xiangdong Ding, Kaiyuan Yu, Turab Lookman, Jun Sun
Summary: Metastable engineering is used to dope conventional shape memory alloys (SMAs) in order to achieve ultralow hysteretic superelasticity. Large-scale molecular dynamic simulations demonstrate the influence of dopants on the phase transformation process of SMAs.
Article
Materials Science, Multidisciplinary
Ekaterina Timofeeva, Elena Panchenko, Maria Zherdeva, Aida Tokhmetova, Yuriy I. Chumlyakov
Summary: The effect of aging on the cyclic stability of superelasticity in quenched and aged NiFeGaCo single crystals was studied. It was found that both quenched and aged crystals exhibited highly stable superelasticity during more than 10^5 loading/unloading cycles. The degradation of superelasticity was divided into stages, and the aging crystals showed different degradation mechanisms compared to the quenched crystals, including a non-uniform distribution of dislocations and the appearance of residual martensite.
Article
Materials Science, Multidisciplinary
Elena Y. Panchenko, Eleonora Yanushonite, Anna S. Eftifeeva, Aida B. Tokhmetova, Irina D. Kurlevskaya, Anton Tagiltsev, Nikita S. Surikov, Ekaterina E. Timofeeva, Yuri Chumlyakov
Summary: This study investigated the effect of gamma '-phase dispersed particles on martensitic transformations and the elastocaloric effect in aged Ni54Fe19Ga27 single crystals. It was found that aging strongly influences the elastocaloric properties of the crystals. The addition of semi-coherent gamma '-phase particles of specific sizes can significantly increase the operating temperature range and adiabatic cooling values of the elastocaloric effect.
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)