Article
Materials Science, Multidisciplinary
Jinmian Yue, Peng Peng, Anqiao Zhang, Shengyuan Li, Wanchao Zheng, Li Lu, Shudong Zhou
Summary: In this study, directional solidification method was used to investigate the growth characteristics of intermetallic compounds in Sn-9at.%Co peritectic alloy. The transition of the leading phase was found to occur at a distance that increased with growth velocity, and the hardness was observed to increase with growth velocity as well.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Patric Berger, Hans Flandorfer
Summary: Lithium containing alloy systems, especially the ternary Li-Sb-Sn system, are studied as potential electrode materials for lithium ion batteries. Experimental results show that SbSn can uptake up to 15 at.% Li, forming Li3Sb and confirming the ternary phase Li8SbxSn3-x.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jiaojiao Yi, Liqiao Yue, Rongjie Xue, Yin Wang, Gongji Yang
Summary: In Al-based metallic glasses, the precipitation of fcc-Al nanocrystals can be classified into one-step direct crystallization and two-step separated crystallization. The inhomogeneous distribution of Al-rich regions in the glass determines the morphology of fcc-Al nanocrystals but not the two-step separated crystallization processes. Other factors such as elemental doping (e.g., Si) are not dominant in the two-step separated fcc-Al crystallization, which is likely attributed to factors such as Al concentration, gradient in original Al-rich regions, diffusion capability of elements, and the crystallized products.
Article
Materials Science, Multidisciplinary
Guoming Zheng, Bin Tang, Songkuan Zhao, William Yi Wang, Ying Ding, Zhiman Zhao, Lei Zhu, Jinshan Li
Summary: This study reveals that the cellular reaction is controlled by grain boundary migration mechanism and element diffusion, resulting in the phase transformation of α2-γ and βo. The metastable lamellar system is transformed to an equilibrium state through microstructure coarsening. Elements such as Ti, Nb, and Mo play a role in triggering the phase transformation. Increasing aging temperature and extending soaking time further transform the lamellar structure into a pearlitic-like microstructure. The thermal stability of the pearlitic-like microstructure makes it a promising design for high-temperature applications of TiAl alloy.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Shun Guo, Wang Ding, Minkyung Kwak, Guanglei Liu, Haixia Liu, Xiaonong Cheng, Yang Zhao, Xinqing Zhao
Summary: A novel multiphase Zr-30Ti-7Nb-4Sn alloy consisting of beta, alpha' and alpha '' phases was designed and fabricated to investigate the mechanical mechanisms responsible for the deformation behavior in multiphase Zr-based alloys involving two different martensites. The results reveal that extensive beta ->alpha '' stress-induced martensitic (SIM) transformation and the reorientation of pre-existing alpha '' martensitic variants occur during loading. Incomplete reverse alpha ''->beta SIM transformation takes place during unloading, leading to residual macroscopic strain in the specimen.
MATERIALS TODAY ADVANCES
(2022)
Article
Chemistry, Physical
Serhii Teslia, Anatoliy Stepanchuk
Summary: In this study, Al-15 wt % Fe powders were prepared using two methods and the effects of milling time and temperature field distribution during atomization on the morphology and microstructure were investigated. It was found that centrifugal atomization resulted in a microstructure with reinforcing effects, consisting of alpha-Al-matrix, stable Al13Fe4, and randomly oriented short fibres of metastable Al6Fe.
Article
Chemistry, Physical
J. Lapin, K. Kamyshnykova, T. Pelachova, S. Nagy
Summary: The study shows that the addition of carbon and the cooling rate have an impact on the lamellar structure of the Ti-46.5Al-5Nb-0.2B-0.2C alloy, affecting phase transformation temperatures and interlamellar spacing. Vickers microhardness also increases with higher carbon content and faster cooling rates.
Article
Nanoscience & Nanotechnology
Tianhao Liu, Limin Lai, Siming Xiao, Meifang Tang, Hongju Zhang, Shengfeng Guo
Summary: In this study, a new ternary system of Fe-W-B BMGs with ultrahigh thermal stabilities and hardness was successfully developed, showing promising applications in extreme service environment. The thermal properties and simple chemical components of Fe-W-B BMGs make them model materials for understanding the glass formation mechanism of Fe-based BMGs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Qing Cai, Changming Fang, Chamini Mendis, Isaac T. H. Chang, Brian Cantor
Summary: Eutectic alloys were fabricated from the quaternary Al-Cu-Si-Ni system, and a ternary eutectic reaction was found. The as-solidified microstructure exhibited a lamellar theta-Al2(CuNi) phase and fibrous Si morphology. The thermal stability of the eutectic alloy was investigated, and the Ni solution in theta-Al2(CuNi) phase contributed to its thermal stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Patric Berger, Clemens Schmetterer, Herta Effenberger, Hans Flandorfer
Summary: This study presents the first reported isothermal sections of the Sb-Sn-Ti system at different temperatures, identifying two new ternary phases and determining their crystal structures using X-ray diffraction.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Hongfei Cheng, Jun Zhou, Huiqing Xie, Songlin Zhang, Jintao Zhang, Shengnan Sun, Ping Luo, Ming Lin, Shijie Wang, Zhenghui Pan, John Wang, Xian Jun Loh, Zhaolin Liu
Summary: Direct formic acid fuel cells (DFAFCs) are a promising energy source in the future low-carbon economy, but the lack of efficient electrocatalysts for anodic formic acid oxidation (FAO) hinders their scale-up and commercialization. The FAO performance of palladium hydrides (PdHx) has been found to be superior to pristine Pd, and this study explores the controlled synthesis and electrocatalytic behaviors of PdHx-based nanomaterials. The hydrogen intercalation-induced crystallization of PdNiP alloy nanoparticles is reported, and the obtained PdNiP-H nanoparticles exhibit excellent FAO performance, demonstrating their potential for DFAFC applications.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Xiaojun Sun, Jie He, Hongxiang Jiang, Lili Zhang, Jiuzhou Zhao
Summary: By using microalloying elements to tailor the microstructure, a honeycomb-like heterogeneous structure is formed in Cu-Fe-Zr MGs, and the correlation between the heterogeneous structure and the deformation behavior is discussed. Nanoscale glassy particles play an interesting role in the evolution of local structure, indicating a significant decrease in the volume of shear transformation zone in heterogeneous MGs. This work is valuable for understanding the relationship between structure and property of MGs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Yanqing Zhang, Xianjie Zhang, Shuiyuan Yang, Shaobin Pan, Jinming Wang, Yong Lu, Jiajia Han, Xingjun Liu, Cuiping Wang
Summary: The phase equilibria of the Co-V-Ga ternary system at 1000 degrees C and the composition dependence of martensitic transformation characteristics in Co2VGa Heusler alloys were investigated. The study identified different phases and compounds in the system, determined critical compositions, and designed a shape memory alloy with significant shape recovery. The results provide valuable information for composition designation and estimation of martensitic transformation temperatures in Co-V-Ga Heusler shape memory alloys.
Article
Materials Science, Multidisciplinary
Sun-Woo Nam, Sang-Min Park, Do-Hyang Kim, Taek-Soo Kim
Summary: The extraction behavior of dysprosium in a Dy-Fe-B alloy system was investigated through the liquid metal extraction process. The diffusion behavior of dysprosium, temperature, and reaction time were found to influence the extraction rate, with temperature and reaction time positively correlated with extraction efficiency. Additionally, microstructural and compositional properties were analyzed to understand the diffusion behavior in detail.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Asaf Dana, Emil Bronstein, Eilon Faran, Veijo Honkimaki, Klaus-Dieter Liss, Doron Shilo
Summary: The martensitic transformation in shape memory alloys is known to be very fast. However, its rate in bulk materials that serve in common actuator applications is still an open question. In this study, the researchers induced the martensitic transformation in a polycrystalline NiTi shape memory alloy wire using a high-voltage microsecond superheating pulse, and tracked its rate using time-resolved X-ray diffraction. They found that the transformation rate follows the rate of heating, completing most of the process within approximately 1 µs, but a part of the transformation continues at much slower time scales of several tens of microseconds.
SCRIPTA MATERIALIA
(2023)
Article
Metallurgy & Metallurgical Engineering
Jiang You, Cheng Wang, Shun-Li Shang, Yipeng Gao, Hong Ju, Hong Ning, Yi Wang, Hui-Yuan Wang, Zi-Kui Liu
Summary: Tailoring phase formation in alloys to achieve desired mechanical properties, especially for complicated multi-phase alloys, is a long-sought goal. The nucleation of competitive crystalline phases during solidification depends on the nature of the liquid. In this study, ab initio molecular dynamics simulations were used to reveal the liquid configuration of Mg-Al-Ca alloys and its effect on the transformation of Ca-containing Laves phase from Al 2 Ca to Mg 2 Ca with increasing Ca/Al ratio ( r Ca / Al ).
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
Marlena Ostrowska, Paola Riani, Brandon Bocklund, Zi-Kui Liu, Gabriele Cacciamani
Summary: In this study, the computational thermodynamics of Al-Co-Cr-Fe-Ni alloys were modeled using the CALPHAD approach based on literature data and key experimental results. A thermodynamic database for Al-Co-Cr-Fe-Ni was developed, incorporating assessments of binary and ternary subsystems and the addition of quaternary interaction parameters. The computed phase equilibria in the quinary system showed good agreement with experimental data.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Zi-Kui Liu
Summary: Through the flux equations based on the combined law of thermodynamics, a theory of cross phenomena has been developed and applied to various fields. It is found that the coefficient matrix of cross phenomena exhibits a diagonal structure when the driving forces are chosen appropriately.
MATERIALS RESEARCH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Shun -Li Shang, Yi Wang, Zi-Kui Liu
Summary: In this study, a method to quantify the degree of disorder using configurational entropy is proposed, which can be used to predict the macroscopic functionalities of materials. The capability of this approach is demonstrated by calculating Invar Fe3Pt and comparing the results with experimental data.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Danial Khatamsaz, Brent Vela, Prashant Singh, Duane D. D. Johnson, Douglas Allaire, Raymundo Arroyave
Summary: In this study, a method for solving complex multi-objective alloy design problems was proposed. The Mo-Nb-Ti-V-W system was investigated as a representative Multi-Principal Element Alloy (MPEA) for potential use in next-generation gas turbine blades. The proposed approach successfully identified 21 Pareto-optimal alloys that satisfy all constraints, and it was found to be significantly more efficient and faster than a brute force approach.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Songge Yang, Yi Wang, Zi-kui Liu, Brajendra Mishra, Yu Zhong
Summary: This study systematically investigates the stability, phonon spectra, thermodynamics, and temperature-dependent elasticity of subsystems of FCC FeNiCoCr MEAs using the ab initio approach. By utilizing the quasi-harmonic approximation and the innovative Zentropy theory, the thermodynamic and elastic properties of FeNi, NiCo, FeNiCo, and FeNiCoCr MEAs considering magnetic transition were successfully predicted. The predicted results are in good agreement with available experimental data and CALPHAD prediction.
Article
Materials Science, Multidisciplinary
Songge Yang, Yi Wang, Zi-Kui Liu, Yu Zhong
Summary: This study investigates the total energy, phonon spectra, and thermodynamic properties of different polymorphs of pure Fe using the ab initio approach. The energy vs. volume curves and phonon spectra obtained show good agreement with previous calculations and experimental data. The thermodynamic properties are estimated using the quasiharmonic approximation, and a superposition approach based on Zentropy theory is used to predict magnetic transition temperatures and thermodynamic properties of pure Fe. The results demonstrate good agreement with experimental data and CALPHAD modeling.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
A. Leineweber, M. Hoppe, S. Martin, C. Schimpf, S. L. Shang, Z. K. Liu
Summary: The reactive interaction between Sn-rich solders and transition metals at high temperatures leads to the formation of intermetallic phases. This study focuses on the formation of intermetallics between Co and Sn under solid-state conditions. The crystal structures and microstructures were characterized using X-ray diffraction and electron microscopy techniques. The results revealed different crystal structures for CoSn3 and CoSn4 compared to previous studies. The criteria for accurate phase identification using XRD and EBSD methods were elaborated, including distinguishing different polytypes of CoSn3 or CoSn4.
Article
Engineering, Mechanical
Adnan Eghtesad, Qixiang Luo, Shun -Li Shang, Ricardo A. Lebensohn, Marko Knezevic, Zi-Kui Liu, Allison M. Beese
Summary: This study combines a full-field crystal plasticity model with a first principles-informed dislocation density hardening law and a machine learning approach to investigate the microstructural features correlated with micromechanical field localization in polycrystalline Ni. The results show that regions near grain boundaries, higher Schmid factors, low slip transmissions, and high intergranular misorientations are more prone to being micromechanical hotspots. The integration of physics-based crystal plasticity with machine learning provides insights into the initiation zones of micromechanical damage in polycrystalline metals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Analytical
Stephanie Castro Baldivieso, Nathan D. Smith, Zi-Kui Liu, Hojong Kim
Summary: The electrochemical behavior of Gd(III) ions in molten LiCl-KCl-GdCl3 was studied. A single reduction-oxidation wave was observed, confirming a single-step, 3-electron transfer Gd(III)/Gd transition. The cathodic peak potential showed minimal change over a wide range of scan rates, indicating reversible electrode process. The diffusivity values of Gd(III) ions were determined, and the Gd-Bi alloy reference electrode exhibited high stability.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Zi-Kui Liu, Shun-Li Shang, Jinglian Du, Yi Wang
Summary: The thermodynamics of ferroelectric materials and their ferroelectric to paraelectric (FE-PE) transitions are often described by phenomenological Landau theory and more recently by effective Hamiltonian and various potentials. In this study, the zentropy theory is proposed to predict the FE-PE transition without parameter fitting. By considering the total entropy of a system as a weighted sum of entropies of configurations and the statistical entropy among the configurations, the zentropy theory accurately predicts the FE-PE transition in PbTiO3 using first-principles domain wall energies as the only input parameter.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
Zhening Yang, Hui Sun, Zi-Kui Liu, Allison M. Beese
Summary: This study integrates five hot cracking criteria into feasibility diagrams for three-alloy functionally graded materials (FGMs) fabricated using directed energy deposition (DED) additive manufacturing (AM) to predict crack susceptibility and phase formation. Equilibrium simulations based on Scheil results are carried out to consider solidification microsegregation. The proposed approach successfully predicts crack susceptibility, detrimental phase formation, or interdendritic BCC phase formation in the experimentally observed cracking region, demonstrating its utility in designing future FGMs gradient pathways.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Yi Wang, Yihuang Xiong, Tiannan Yang, Yakun Yuan, Shun -Li Shang, Zi-Kui Liu, Venkatraman Gopalan, Ismaila Dabo, Long-Qing Chen
Summary: This study presents a first-principles-based approach to calculate finite temperature thermal and electronic transport properties. It can be used to model and understand structural evolution during electronic, magnetic, and structural phase transitions at the mesoscale. A computationally tractable model is introduced to estimate electron relaxation time and its temperature dependence. The model is applied to Ca3Ru2O7 to investigate the electrical resistivity across the electronic phase transition at 48 K. The quasiharmonic phonon approach and Boltzmann transport theory are employed to account for thermal expansion and calculate the temperature dependence of electrical conductivity.
Article
Nanoscience & Nanotechnology
Bo Pan, Hui Sun, Dongyue Xie, Shun-Li Shang, Nan Li, Blair E. Carlson, Yumeng Li, Zi-Kui Liu, Jingjing Li
Summary: This study investigates the correlations between galvanic corrosion, intermetallic compound formation, and welding energy input with regards to the initiation and propagation of micro-cracks in micropillars of resistant spot welding joints between aluminum and steel. The results show that higher welding energy leads to more severe corrosion and easier cracks initiation and propagation. Micropillars from the high welding energy region have a higher average yielding stress due to the thicker intermetallic compound layer.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Chemistry, Physical
Kaixin Liang, Hui Zhang, Yongfeng Liang, Shun-Li Shang, Zi-Kui Liu, Junpin Lin
Summary: By coordinating nitrogen doping and pore structure, N-doped porous carbon materials were fabricated with highly comparable properties to commercial Pt/C catalysts. These carbon catalysts exhibited high catalytic activity and peak power density, making them highly feasible for practical applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
M. H. Abbasi, R. Tavakoli, S. G. Shabestari
Summary: The correlation between atomic-scale structure and glass-forming ability of ternary bulk metallic glasses was investigated using molecular dynamics simulation. It was found that the potential energy of the icosahedra reflects the geometric ordering, while the virial stress energy density reveals the chemical ordering. Based on this discovery, a new prediction criterion for glass-forming ability was proposed and validated using experimental data.
Article
Chemistry, Physical
Haimin Zhai, Shuai Cui, Sheng Li, Dongqing He, Bo Cheng, Xinjian Zhang, Wensheng Li, Zhornik Viktor, Uladzimir Seniuts
Summary: Laser shock peening (LSP) treatment significantly affects the phase structure and properties of titanium-based BMG materials, promoting rejuvenation and introducing heterogeneity. This leads to improved plasticity and resistance to crack propagation. LSP-1 specimen exhibits higher hardness and plasticity, reducing fatigue peeling wear caused by brittleness. However, excessive LSP results in increased susceptibility to pitting and significantly reduces tribocorrosion resistance.
Article
Chemistry, Physical
Olga A. Blatova, Maria A. Solodovnikova, Ekaterina M. Egorova, Vladislav A. Blatov
Summary: This study applied a universal geometrical-topological approach to analyze the crystal structures of intermetallic compounds deposited in the Inorganic Crystal Structure Database. By exploring the local atomic configurations, they identified different types of coordination polyhedra and proposed criteria for determining geometric instability. This research provides useful indicators for checking crystallographic information and validating structural models.
Article
Chemistry, Physical
Jose M. Torralba, Diego Iriarte, Damien Tourret, Alberto Meza
Summary: The amount of globally recycled e-waste is less than 20% of the total produced. One of the causes for this low recycling rate is the complex and expensive selective sorting of metals. However, recent research has shown that high entropy alloys (HEAs) can be made from complex alloy mixtures, reducing the dependence on pure critical metals. It has been demonstrated that e-waste can be used to produce competitive HEAs.
Article
Chemistry, Physical
M. Y. He, Y. F. Shen, N. Jia, W. Y. Xue, J. P. Li
Summary: This study successfully improved the mechanical properties of high-entropy alloys (HEAs) through phase decomposition modulation, achieving strengthening of low-cost CuFeMnNi HEAs. The annealed HEAs exhibited excellent mechanical properties, with significantly increased yield strength and maintained satisfactory elongation.
Article
Chemistry, Physical
D. V. Louzguine-Luzgin, F. R. Pratama
Summary: In this study, the growth rate of a crystalline phase in the Al-Fe-Mn-Si metallic glass was measured in real time using transmission electron microscopy. The effective diffusion coefficient related to the slowest diffusing element (Mn) was estimated. The results showed that the growth rate of the crystalline phase was significantly faster compared to pure Al and AlFe compound.
Article
Chemistry, Physical
Zhenhua Han, Yubo Tian, Jun Yang, Jianzhao Li, Jinyang Zhang, Gang Liu, Ran Wei, Guojun Zhang
Summary: In this study, a novel medium-entropy alloy (MEA) (Fe65Ni15Cr10Co10)92Ti5Al3 with a dual heterogeneous structure was developed by adding Ti and Al to a previously reported Fe65Ni15Co10Cr10 MEA. The MEA exhibited ultra-high ultimate tensile strength and work hardening extent at room temperature. The addition of Ti and Al induced precipitation and resulted in a continuous FCC -> BCC martensitic transformation and a transformation-induced plasticity effect. The excellent mechanical properties of the alloy were attributed to the synergistic effects of hetero-deformation induced strengthening, precipitation strengthening, and TRIP.
Article
Chemistry, Physical
S. Y. Liang, L. T. Zhang, B. Wang, Y. J. Wang, E. Pineda, J. C. Qiao
Summary: This study focuses on the influence of the thermomechanical protocol on the aging or rejuvenation of glass by decoupling the thermal and mechanical processes. The results show that Labased metallic glass exhibits material hypomnesia, with a clearer rejuvenation trend observed after imposing increasing amplitude strain oscillations. There is a threshold value of the oscillation amplitude that separates the effects of the protocol into acceleration of aging or rejuvenation. This study reveals the correlation between the thermomechanical properties of metallic glass and the previous application of strain oscillations of various amplitudes, providing an effective tool for regulating the structural state of metallic glasses through a simple-operated method.
Article
Chemistry, Physical
Chihui Liu, Hua Zhang, Qing Wang, Panzhi Wang, Jiadian Yang, Fanchao Meng, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: Thermal deformation behavior and microstructure evolution of GH141 alloy were efficiently studied using high-throughput double-cone gradient compression. Different compression temperatures resulted in a wide gradient equivalent strain distribution and gradient microstructure. The dynamic recrystallization mechanism shifted towards discontinuous dynamic recrystallization with increasing compression temperature.
Article
Chemistry, Physical
D. Dubaux, J. Zollinger, M. -C. de Weerd, J. Ghanbaja, S. Mathieu, S. Migot, P. Boulet, S. Sturm, V. Fournee, M. Sicot, J. Ledieu
Summary: We report the formation of large and highly twinned dendrites of the Al13Fe4 approximant phase embedded in an fcc Al-rich matrix. Using a rapid cooling technique, the approximant appears as a 10-fold dendrite. The grain distributions within the arm are complex and a single dendrite arm can contain up to four different orientations. Three types of twins, namely {100}, {001} and {201} twins, have been identified. A growth mechanism involving heteroepitaxial growth from a decagonal Al-Fe quasicrystalline seed is proposed to explain the formation of these specific 10-fold motifs.
Article
Chemistry, Physical
Ming Yang, Yibo Zhang, Jie Dong, Yan Huang, Zhichao Lu, Liang Wang, Xuerui Wei, Zhengdong Fu, Jinkui Zhao, Wenli Song, Wei Li, Yuntao Liu, Dong Ma
Summary: A multi-element microalloying strategy has been used to improve the microstructure and mechanical properties of CuZr-based bulk metallic glass composites. Microalloying effectively refines the CuZr phase and results in finely dispersed B2 crystallites embedded in the BMG matrix, leading to the formation of centimeter-sized BMGCs with good mechanical properties.
Article
Chemistry, Physical
Xuejie Zhu, Xuexi Zhang, Mingfang Qian, Ziyi Wang, Aibin Li, Zongning Chen, Muhammad Imran, Lin Geng
Summary: The homogeneous superelastic behavior in shape memory alloys (SMAs) is crucial for their functional and structural fatigue properties, as well as their stable elastocaloric effect (eCE). In this study, a Ti-22Nb-4Zr-2Ta plate was prepared with a strong recrystallized texture, resulting in a completely recoverable superelastic strain and narrow hysteresis. The observation of strain and temperature evolution revealed the importance of diffuse transformation and favorable texture in achieving mesoscopically homogeneous transformation and related elastocaloric effect.
Article
Chemistry, Physical
Mohammad Navazani, Sitarama Raju Kada, Daniel Fabijanic, Matthew Barnett
Summary: This study investigates the effect of Cu and Al addition on an alloy containing multiple principal elements. The results show that adding small amounts of Cu can improve the alloy's ductility and the hardness of the FCC phase can be predicted using a hybrid model. Unlike previous studies, the corrosion resistance of the alloy is not affected by Cu addition, indicating its potential for further development into a fine-grained stainless steel alloy.
Article
Chemistry, Physical
Fatemeh Azizian, Homam Naffakh-Moosavy, Fatemeh Bagheri
Summary: Novel biodegradable Zn-xCu-0.8Mn-0.4Ag alloys were prepared in this study, and the effects of Cu addition and hot extrusion process on microstructure, mechanical properties, and cytotoxicity of the alloys were investigated. The results showed that adding copper and performing a hot extrusion process can significantly improve the mechanical properties of the alloys, making them potential candidates for cardiovascular stents.
Article
Chemistry, Physical
Ivan A. Ditenberg, Denis A. Osipov, Ivan Smirnov, Konstantin V. Grinyaev
Summary: This study investigates the effect of high-temperature annealing on the structural-phase state and microhardness of Ni3Al samples obtained by spark plasma sintering after high-energy ball milling. The results show that certain annealing temperatures promote grain growth and high-density nucleation, leading to the formation of a fine-grained structural state. The study also analyzes the influence of annealing temperature on the strengthening mechanisms.
