Article
Materials Science, Multidisciplinary
J. Ding, A. Inoue, S. L. Zhu, S. L. Wu, E. Shalaan, A. A. Al-Ghamdi
Summary: This study investigated the effects of increased aluminum content on the glass-forming ability, microstructure, phase stability, mechanical properties, and deformation behaviors of Zr-rich Zr-Cu-Al alloys in bulk metallic glass composites (BMGCs). It was found that higher aluminum content improved the glass-forming ability of the alloys, leading to the fabrication of BMGCs with enhanced performance. The Zr-rich Zr-Cu-Al BMGCs exhibited a large fracture strain and high fracture strength under compression, with superior plastic deformation capabilities attributed to factors such as the formation of shear bands and interactions between crystals and shear bands.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Ceramics
Defeng Song, Linfang Qian, Jili Wu
Summary: This study investigates the room-temperature nanoindentation creep behaviors of as-cast and aged CuZrTiNb bulk metallic glasses, showing that ageing influences the hardness, creep displacement, and resistance to localized plastic deformation of the materials. Ageing decreases the resistance to localized plastic deformation but increases the creep resistance of current bulk metallic glass. The quantity of large holes decreases while that of small voids increases with ageing, as revealed by compliance and retardation spectra analysis.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Nanoscience & Nanotechnology
Jiazi Bi, Xinquan Wei, Xiaobin Liu, Ran Li, Ruijuan Xiao, Tao Zhang
Summary: A family of novel Os-Co-Ta-B high-temperature bulk metallic glasses (HTBMGs) with high glass transition temperature, Vickers microhardness, and compressive strength was fabricated by introducing high-modulus refractory metal Os and strong-covalent metalloid B. The impressive strength is attributed to the strong bond characteristics especially for Ta-Os and B-B bonds. The castable OsCo-based HTBMGs with superior mechanical properties and high thermal stabilities are significant for high-temperature applications as advanced structural materials.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Hongbo Fan, Nan Wang, Chao He, Yongjiang Huang, Zhiliang Ning, Jianfei Sun
Summary: Pre-straining of a CuZrAl bulk metallic glass was conducted to investigate the physical correlation between structural heterogeneity and nano-mechanical performance. The glass maintained its amorphous structure as the pre-strain increased, while the degree of local order exhibited a decreasing and then increasing trend, with a minimum value at 10% pre-strain. The Helmholtz activation energy, shear transformation zone volume, number of atoms in the STZ, and nanohardness value showed a similar trend. The results suggest that the structure and mechanical properties of BMGs can be tailored through pre-straining.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Mehdi Malekan, Reza Rashidi, Mansoor Bozorg, Nick Birbilis
Summary: The effect of yttrium (Y) on the glass-forming ability (GFA), mechanical properties and corrosion of (Cu50Z-r43Al7)100-xYx alloys was studied. The addition of Y improved the GFA of Cu50Zr43Al7 alloy, with a GFA of 15 mm obtained for (Cu50Zr43Al7)98Y2. The bulk metallic glasses (BMGs) exhibited limited plastic strain but achieved high compressive fracture strength and Young's modulus. The corrosion resistance of the BMGs was improved by the addition of Y.
Article
Nanoscience & Nanotechnology
Mingcan Li, Huimin Guan, Sen Yang, Xu Ma, Qiang Li
Summary: A new strategy of minor substitution has been proposed to enhance the plasticity and yielding strength of ductile Fe-based bulk metallic glasses. The locally modified structure leads to improved resistance to shear band formation and propagation, resulting in significant improvement in both properties. One example is the development of (Fe1/3Co1/3Ni1/3)(77.5)Cr-2.5(P1/2B1/2) 20 high entropy bulk metallic glass, which shows substantial enhancement in plasticity and yielding strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Yunfei Ma, Xuefeng Tang, Xin Wang, Mao Zhang, Huie Hu, Pan Gong, Xinyun Wang
Summary: The study prepared tungsten-particle-reinforced bulk-metallic-glass composites with varying Wp volume fractions using spark plasma sintering, and found that the mechanical properties of the composites were significantly influenced by the volume fraction of Wp. The increase in Wp volume fraction not only affected the mechanical properties of the composites, but also improved their self-sharpening ability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
Y. Tan, Y. W. Wang, X. W. Cheng, Q. Fu, Z. H. Xin, Z. Q. Xu, H. W. Cheng
Summary: The study found that appropriate Al substitution can improve the glass-forming ability, strength, and plasticity of amorphous alloys, but fracture strength decreases and no dynamic compression plasticity is observed during dynamic loading.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Physics, Multidisciplinary
LangTing Zhang, YaJuan Duan, Daniel Crespo, Eloi Pineda, YunJiang Wang, Jean-Marc Pelletier, JiChao Qiao
Summary: Dynamic mechanical relaxation is a fundamental tool for understanding the mechanical and physical properties of viscoelastic materials like glasses. The high-entropy bulk metallic glass exhibits a distinct beta-relaxation feature. Anelastic strain is contributed by the stochastic activation of shear transformation zones (STZs), and interactions between STZs induce viscous-plastic strain under certain conditions.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Metallurgy & Metallurgical Engineering
Da-wei Ding, Jing Tan, An-hui Cai, Yong Liu, Hong Wu, Qi An, Peng-wei Li, Yan Zhang, Qing Yang
Summary: The study found that Fe-C micro-alloying can improve the glass forming ability and physical and chemical properties of bulk metallic glasses (BMGs), but an increase in Fe and C content within a certain range may lead to a decrease in properties such as hardness.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Review
Materials Science, Multidisciplinary
Cheng Zhang, Di Ouyang, Simon Pauly, Lin Liu
Summary: Bulk metallic glasses (BMGs) as metallic materials without long-range order have attracted significant attention from academia and industry in the past three decades. The emerging 3D printing technology provides a viable route to overcome the challenges inherent in conventional processing routes and expand the applications of BMGs.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Review
Materials Science, Multidisciplinary
Navid Sohrabi, Jamasp Jhabvala, Roland E. Loge
Summary: Bulk Metallic Glasses (BMG) are metallic alloys with the ability to solidify in an amorphous state, showing enhanced properties. However, conventional methods for producing BMGs are limited. Additive manufacturing techniques may provide a potential solution to overcome these limitations.
Article
Nanoscience & Nanotechnology
L. T. Zhang, Y. J. Wang, E. Pineda, H. Kato, Y. Yang, J. C. Qiao
Summary: The study found that high-entropy metallic glasses have a relatively homogeneous structure, smaller activation volumes, and sluggish free volume evolution during high-temperature deformation. Spectrum analysis can help delineate the deformation details of high-entropy metallic glasses. This core finding sheds light on the structural heterogeneity and sluggish dynamics, providing an essential piece for understanding the deformation mechanism of high-entropy metallic glasses.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Multidisciplinary
LangTing Zhang, YaJuan Duan, YunJiang Wang, Yong Yang, JiChao Qiao
Summary: In this paper, it is demonstrated that cooling a BMG from the supercooled liquid region at laboratory rates can reverse the relaxation enthalpy lost during the preceding structural relaxation. Increasing the cooling rate enhances atomic mobility and dynamic mechanical relaxation intensity. This rejuvenation methodology facilitates tailoring the mechanical properties of BMGs and provides a comprehensive understanding of the rejuvenation mechanism.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Silvia Pomes, Nozomu Adachi, Masato Wakeda, Takahito Ohmura
Summary: This study found a precursor phenomenon to incipient plasticity before the first serration in Zr50Cu40Al10 at% bulk metallic glass via nanoindentation testing.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Yakai Zhao, Jeong-Min Park, Jae-il Jang, Upadrasta Ramamurty
Summary: Spherical tip nanoindentation experiments on two typical face-centered cubic high-entropy alloys (HEAs) revealed a bimodal probability density distribution in the onset of incipient plasticity, with heterogeneous dislocation nucleation at lower stresses and homogeneous dislocation nucleation at higher stresses. High-temperature aging was found to enhance the alloy's strength by increasing the stress required for homogeneous dislocation nucleation.
Article
Materials Science, Multidisciplinary
Il-Hyun Kim, Myung-Ho Lee, Yang-Il Jung, Hyun-Gil Kim, Jae-Il Jang
Summary: The study investigated the behavior of dynamic strain aging (DSA) in a Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr alloy strip through tension tests at different temperature ranges, revealing a linear relationship between shear stress and test temperature, with the effect of strain rate on this linear relationship. The findings also showed variations in DSA effects between samples oriented in the rolling direction and transverse direction.
KOREAN JOURNAL OF METALS AND MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Wenrui Zhao, Jae-Kyung Han, Yulia O. Kuzminova, Stanislav A. Evlashin, Alexander P. Zhilyaev, Alexander M. Pesin, Jae-il Jang, Klaus-Dieter Liss, Megumi Kawasaki
Summary: The study highlights the significance of grain refinement achieved through high-pressure torsion on the mechanical properties and structure of AM CoCrFeNi HEA, demonstrating high strain hardening capability and increased plasticity in the nanostructured HEA, with structural evolution showing decreasing crystallite size, increasing microstrain, and expanding lattice parameter. This provides advantages of nanostructuring for current developments in the AM technology of HEAs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yeonju Oh, Won-Seok Ko, Nojun Kwak, Jae-il Jang, Takahito Ohmura, Heung Nam Han
Summary: This study utilizes small-scale techniques to comprehensively investigate the ductile-to-brittle transition (BDT) behavior of pure tungsten. By proposing a practical fracture analysis diagram and conducting high temperature nano-indentation tests and atomistic simulations, the inherent mechanical properties and fracture behaviors of tungsten are studied. The results demonstrate the significant relevance between small-scale mechanical properties and macroscopic BDT behavior in pure tungsten.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jae-Hwan Kim, Young-Hwan Lee, Jun-Hyoung Park, Byeong-Joo Lee, Young-Woon Byeon, Jae-Chul Lee
Summary: Research shows that in the Na-Sn battery system, the generation of high-density dislocations in crystalline Sn relieves the residual stresses near the interface, facilitating the ultrafast diffusion of sodium into the Sn crystal and improving battery performance. Combining multi-scale simulations and molecular dynamics can help explain the structural origins of these ultrafast diffusion rates.
Article
Engineering, Electrical & Electronic
Dong-hun Lee, Jae-il Jang, Young-Ho Kim
Summary: In this study, Au-20wt%Sn solder joints were fabricated using thermo-compression bonding, and the microstructure and shear strength of the solder joints were investigated. The results showed that the joining temperature and time significantly affected the shear strength of the solder joints.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Zhe Gao, Yakai Zhao, Jeong-Min Park, A-Hyun Jeon, Kotaro Murakami, Shin-ichi Komazaki, Koichi Tsuchiya, Upadrasta Ramamurty, Jae-il Jang
Summary: This study compared the effects of hydrogen on the thermal desorption and nanoindentation responses of nanocrystalline dual-phase alloys and coarse-grained alloys, showing that the FCC phase is more susceptible to hydrogen-induced hardening than the BCC phase. However, this difference is negated in the nanocrystalline samples.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Dong-Hyun Lee, Zhe Gao, Jeong-Min Park, Yakai Zhao, Jin-Yoo Suh, Eric A. Jagle, Koichi Tsuchiya, Upadrasta Ramamurty, Jae-il Jang
Summary: The significant strengthening of SLM 304L stainless steel after high-pressure torsion treatment is mainly attributed to the synergistic combination of grain refinement and martensitic transformation. In the nanocrystalline regime, the dominance of grain boundary-mediated plasticity retards martensite-induced hardening.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Youngin Lee, Young-Hoon Kim, Jae-Hyun An, Jae-Chul Lee
Summary: This study explores the collective effects of crystal structure, temperature, and electric field on the ionic conductivity of various electrolytes. The results show that abundant stable Li interstitial sites in the crystals shorten the jumping distance for Li self-diffusion, while charge polarization of the P2S7 cluster widens the Li diffusion passage. These findings fill the knowledge gaps regarding the ionic conduction mechanisms and provide design criteria for developing highly conductive solid electrolytes.
Article
Materials Science, Multidisciplinary
Min-Su Jo, Young-Hee Cho, Jung-Moo Lee, Soo-Bae Kim, Su-Hyeon Kim, Jae-il Jang
Summary: The present investigation examined the influence of volume fraction and interconnectivity of hard phases on the elevated temperature strength of multicomponent Al-Si-Cu-Ni alloys. The microstructural features, such as the size and aspect ratio of each phase, changed with ultrasonic melt treatment and cooling rate, affecting the elevated temperature strength at 350 degrees C. Based on a hexagonal shear-lag model, the influence of microstructural factors on the elevated temperature strength was discussed.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Siyuan Wei, Yakai Zhao, Jae-il Jang, Upadrasta Ramamurty
Summary: This study focuses on the role of microstructural interfaces, especially twin boundaries, on the strain-rate sensitivity of high-entropy alloys. The experimental results show that the strain-rate sensitivity, yield strength, and plastic flow behavior in single crystals are orientation dependent due to the differences in crystallographic orientations. The presence of twin boundaries leads to distinct mechanical responses.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Young-Hoon Kim, Jae-Hyun An, Xiangmei Li, Joo-Yeon Moon, Hooam Yu, Hyo-Jun Ahn, Jae-Chul Lee
Summary: The coalescence of metal nanoparticles in colloidal solutions is a widespread phenomenon. A method is developed based on this behavior to transform microsized metals into nanoporous structures. The selection criteria for solvents and counterpart metals for generating nanoporous structures are derived from acid-base reactions theory and density functional theory. The anodes prepared using this method for Na-ion batteries exhibit high capacity and long cycling lifetimes. This study provides a fundamental framework for selecting solvents to produce low-cost anodes with large capacities for various functional materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Hyeon-Woo Son, Ji-Young Lee, Young -Hee Cho, Jae-il Jang, Soo-Bae Kim, Jung-Moo Lee
Summary: This study investigated the effects of melt-holding temperatures on the mechanical properties and T5 age-hardening behavior of Al-Si-Cu-Mg alloys. Increasing the melt-holding temperature from 720°C to 820°C simultaneously enhanced the yield strength, tensile strength, and elongation. The improved mechanical properties of the alloy with high melt-holding temperature were attributed to microstructural changes, including microstructure refinement and accelerated precipitation kinetics. The high melt-holding temperature also changed the solute distribution and accelerated the segregation behavior of Cu on the Si precipitates, resulting in refined precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Taejun Ha, June-Hyung Kim, Changhyo Sun, Dong-Ik Kim, Jin-Yoo Suh, Jae-il Jang, Joonho Lee, Yunseok Kim, Jae-Hyeok Shim
Summary: The effect of Ce addition on the initial hydrogen absorption behavior and microstructural features of AB-type Ti50Fe48V2 hydrogen storage alloys was investigated. Ce addition significantly improved the initial hydrogen absorption kinetics at room temperature, with no significant influence on the pressure-composition isotherms. Fine spherical particles containing Ce were dispersed in the TiFe matrix, and these particles were determined to be gamma-Ce mixed with cerium oxide. Ce particles played a crucial role by providing starting points for initial hydrogenation, explaining the significant increase in primary hydrogen absorption kinetics after Ce addition.
Article
Materials Science, Multidisciplinary
Priyanka Saini, Shankha Nag, Jae-il Jang, In-Chul Choi, Upadrasta Ramamurty, R. L. Narayan
Summary: Statistical analysis is often conducted to understand the micromechanisms of plasticity by analyzing the shear stresses at which the first 'pop-ins' occur during nano-indentation. This study focuses on the second 'pop-in' stress and finds that the 3-parameter Weibull distribution is the best descriptor for its stochasticity. The study also provides insight into the development of plasticity in bulk metallic glasses during nano-indentation.
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.
