Article
Materials Science, Multidisciplinary
Jianning Wang, Wensheng Liu, Yunzhu Ma, Wentan Zhu, Baishan Chen, Lei Zhang, Kuokuo Bao, Chaoping Liang, Qingshan Cai
Summary: This study systematically examines the material evolution during liquid phase sintering (LPS) process in the hot isostatic pressing process (HIP) and proposes a new strategy for designing and fabricating powder metallurgy materials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Ricardo Chavez-Vasconez, Cristina Arevalo, Yadir Torres, Mauricio Reyes-Valenzuela, Sergio Sauceda, Christopher Salvo, Ramalinga Viswanathan Mangalaraja, Isabel Montealegre, Eva M. Perez-Soriano, Sheila Lascano
Summary: This study investigates the interplay between processing parameters, microstructural attributes, and the tribo-mechanical performance of titanium grade 4 biomedical implants. The study finds that a sample composed of 75 wt% milled powder, 10-hour milling duration, and 60 vol% NaCl exhibits superior biomechanical equilibrium and promising application prospects.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
X. F. Xie, K. Jing, Z. M. Xie, R. Liu, J. F. Yang, Q. F. Fang, C. S. Liu, Xuebang Wu
Summary: Pure tungsten, W-0.5 wt%TiC and W-1 wt%Y2O3 materials were prepared by a two-step hot-pressing sintering method. The addition of TiC or Y2O3 effectively improved the sinterability and reduced grain size of the materials, resulting in improved performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Lanqing Liang, Boxin Wei, Mengmeng Zhang, Wenbin Fang, Lei Chen, Yujin Wang
Summary: Novel TiC-based ceramics were prepared by reactive hot-pressing using TiC, Si, and ZrC powders. The microstructure and mechanical properties of the ceramics were found to be influenced by the addition of ZrC and temperature. The main toughening mechanisms observed were crack bridging by the layered Ti3SiC2 and crack deflection by the ZrSi particle. TiC-36 mol% Si-10 mol% ZrC exhibited excellent mechanical properties, surpassing most TiC-based ceramics in previous reports.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Huajun Yan, Wei Wang, Shuangjie Zhang, Shibo Ma, Jianhui Li, Bo Wang
Summary: The Zr-6Al-0.1B alloy, rich in Zr3Al phase, prepared by hot-pressing sintering, shows sensitivity to both temperature and strain rate during thermal deformation. Higher strain rates can refine the grains, but excessive strain rates may exceed the material's deformation capacity and lead to an increase in defects. Increasing the deformation temperature contributes to grain refinement, but excessively high temperatures can decrease the material's deformation coordination and increase the probability of defects.
Article
Engineering, Manufacturing
N. Kumar, P. Sanguino, P. Faia, B. Trindade
Summary: Porous Si100-xSnx samples were produced from Si and Sn elemental powders by mechanical alloying, followed by cold uniaxial pressure and subsequent sintering or hot pressing processes. The samples showed a major porosity close to 0.1 μm, with the Si70Sn30 sample synthesized through the former process having mesoporous characteristics. The final samples were composed of Si, Sn, and SnO phases.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Ceramics
Dianguang Liu, Xinchao Zhang, Jianye Fan, Yi Yuan, Ke Zhao, Jinling Liu, Linan An
Summary: Oscillatory pressure improves the sintering behavior and mechanical properties of alumina ceramics, with higher temperatures yielding better results.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Kundan Kumar, Mi-Ju Kim, Hyeon-Myeong Oh, Young-Jo Park, Ha-Neul Kim, Ho Jin Ma, Jae-Wook Lee, Jae-Woong Ko
Summary: This study fabricated dense Si3N4 ceramics using a low-temperature pressureless sintering technique and examined the effects of three different ternary oxide additives on the material's properties. The results showed that adding 5 wt.% of Y2O3-MgO-Al2O3 additive resulted in high density, strength, and hardness of Si3N4.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Daimeng Chen, Kuibao Zhang, Jianjun Zeng, Haiyan Guo, Bo Li, Baozhu Luo, Xuegang Huang
Summary: In this study, TiB2-B4C composite ceramics were prepared with Y2O3 and Al2O3 as sintering aids, and the addition of 20 wt% B4C resulted in excellent comprehensive mechanical properties in the composite ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Jong Min Byun, Eui Seon Lee, Youn Ji Heo, Young-Keun Jeong, Sung-Tag Oh
Summary: The study attempted to fabricate dense tungsten using a combination process of spark plasma sintering and hot isostatic pressing, achieving an improvement in relative density and higher strength. X-ray diffractometry and X-ray photoelectron spectroscopy analysis revealed that the specimens were mainly composed of tungsten with trace amounts of metallic tungsten bound with oxygen. The strength testing showed promising results with biaxial bending test.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Microscopy
Bo Ren, Rui-feng Zhao, Ai-yun Jiang, Yuan Yu
Summary: The effect of Cr content on the microstructure and oxidation behavior of high-entropy alloys was investigated. Increasing Cr content resulted in increased elemental segregation and improved oxidation resistance for phases rich in Cr.
Article
Chemistry, Physical
Ricardo Chavez-Vasconez, Sheila Lascano, Sergio Sauceda, Mauricio Reyes-Valenzuela, Christopher Salvo, Ramalinga Viswanathan Mangalaraja, Francisco Jose Gotor, Cristina Arevalo, Yadir Torres
Summary: Commercially pure titanium grade IV with a bimodal microstructure is a promising material for biomedical implants. The influence of processing parameters on its physical, microstructural, and mechanical properties was investigated. It was found that a bimodal microstructure and a porous structure could be achieved by blending powder particles with different sizes and using the space-holder technique.
Article
Materials Science, Multidisciplinary
Ke Xiong, Lin Huang, Xiaofeng Wang, Lin Yu, Wei Feng
Summary: The study found that the crystal structure and properties of high-entropy alloys (HEAs) AlxCoCrFeNi are related to the Al content, with changes in hardness, tensile properties, fracture mechanism, and damping capacity observed as the Al content increases.
Article
Chemistry, Physical
Yu Yang, Xiangyu Luo, Tongxiang Ma, Liangying Wen, Liwen Hu, Meilong Hu
Summary: AlxCoCrFeNi high-entropy alloys with varying Al content were prepared using an electrochemical process, and the effects of Al addition on crystal structure, mechanical properties, and corrosion behavior were investigated. Increasing Al content led to a transformation in crystal structure and significantly improved hardness and ultimate tensile strength. AlxCoCrFeNi HEAs prepared by the united process showed comparable corrosion resistance to 304 stainless steel and HEAs prepared by other methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xi Zhang, Zhu Xiao, Ziqi Xia, Shuo Han, Xiangpeng Meng, Yuyuan Zhao, Zhou Li, Qian Lei
Summary: Cu-TiNi composites with different TiNi volume percentages were prepared, and their microstructure, thermal and mechanical properties were analyzed. The results showed that diffusion of elements occurred at the interface and formed a diffusion layer. TiNi particles were uniformly distributed in the Cu matrix and had a well-bonded interface. The hardness and yield strength increased with the increase of TiNi volume percentage, while the thermal expansion coefficient showed an opposite trend.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Mechanical
Yang Chen, Shuo Wang, Hui Feng, Weipeng Li, Bin Liu, Jia Li, Yong Liu, Peter K. Liaw, Qihong Fang
Summary: By conducting high-resolution transmission electron microscopy and random field theory informed discrete dislocation dynamics simulations, this study reveals the influence mechanism of heterogeneous lattice strain on the complex interaction between dislocations and dislocation loops in high entropy alloys (HEAs) under irradiation. The results show that lattice-strain-induced irradiation hardening decreases, in line with the excellent irradiation hardening resistance of HEAs observed in recent experiments. A new cross-slip mechanism is also discovered, involving the co-linear reaction between dislocations and rhombus perfect loops. This study provides insights into the mesoscopic-level irradiation damage behavior, guiding the development of advanced HEA materials for nuclear energy applications through the regulation of heterogeneous lattice strain.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Mechanical
Mingyu Fan, Zhongwu Zhang, Ye Cui, Liyuan Liu, Yingwei Liu, PeterK. Liaw
Summary: A novel nanoscale superlattice precipitate (NSP) with superior strengthening effect is developed by rare-earth Er alloying to magnesium alloys. The newly-developed cast Mg-Y-Zn-Er alloy shows high yield strength, tensile strength, and good ductility. The structure and optimization mechanism of the NSP are systematically investigated using transmission electron microscopy and first-principles calculations.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Lin Deng, Jin-ru Luo, Jian Tu, Rong Hu, Ning Guo, Wen-yu Zeng, Chang-hao Wang, Pei He, Yong Zhang
Summary: As a candidate material for fuel cladding in fission reactors, the mechanical properties of ODS-F/M steel were improved by incorporating ultra-high number density of Y2O3 oxide nanoparticles through the addition of Y2O3 during HIP and optimizing microstructure and properties through hot rolling deformation. The addition of Y2O3 resulted in a bimodal ferrite structure and reticular M23C6 carbides distribution. Following hot rolling, grain size and M23C6 carbides were refined significantly while Y2O3 particle size remained unchanged. This resulted in an excellent combination of strength (1474 MPa) and ductility (13%) in ODS steel prepared by HIP with Y2O3 addition and hot rolling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Shichao Zhou, Chunduo Dai, Huaxing Hou, Yiping Lu, Peter K. Liaw, Yong Zhang
Summary: A bionic bamboo fiber heterogeneous microstructure was created in an ultrafine-grained eutectic high-entropy alloy, AlCoCrFeNi2.1, through multi-pass cold-drawing and subsequent annealing. The bionic microstructure consists of a hard-B2 fiber embedded in a soft-face-centered-cubic (FCC) matrix, resulting in excellent strength and ductility synergy.
SCRIPTA MATERIALIA
(2023)
Correction
Multidisciplinary Sciences
Zongrui Pei, Junqi Yin, Peter. K. K. Liaw, Dierk Raabe
NATURE COMMUNICATIONS
(2023)
Review
Materials Science, Multidisciplinary
Kaixuan Cui, Yong Zhang
Summary: This paper discusses the preparation process, microstructure, hardness, wear resistance, and corrosion resistance of high-entropy alloy films, and analyzes the influence of factors such as nitridation, sputtering power, substrate temperature, and substrate bias on the phase structure of alloy films. High-entropy alloy films can be prepared using various processes. They tend to form a solid solution and amorphous state, and their hardness is much higher than that of traditional films. Some high-entropy alloy films have better corrosion resistance than stainless steel due to the corrosion-resistant elements and amorphous structure. High-entropy alloy films have promising development prospects in wear-resistant coatings, corrosion protection, diffusion barriers, and photothermal conversion coatings.
Article
Chemistry, Physical
Christopher Tandoc, Yong-Jie Hu, Liang Qi, Peter K. Liaw
Summary: Severe lattice distortion is a key feature of high-entropy alloys, but accurate characterizations of lattice distortion are scarce due to high costs. We present a physics-based statistical model for efficient prediction of lattice distortion in refractory non-dilute/high-entropy alloys. The model improves accuracy by considering interatomic bonding properties instead of atomic size mismatch.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
B. Steingrimsson, X. Fan, R. Feng, P. K. Liaw
Summary: Machine learning has become a powerful tool for accurately predicting temperature-dependent yield strengths (YS) of structural materials, especially for multi-principal-element systems. The researchers have developed a bilinear log model that incorporates a break temperature, Tbreak, for predicting temperature-dependent YS of medium-entropy or high-entropy alloys (MEAs or HEAs). This model can guide the design of MEAs or HEAs with attractive high-temperature properties.
APPLIED MATERIALS TODAY
(2023)
Article
Physics, Applied
Rong Hao, Guanhao Liu, Zhong Wang, Huijun Yang, Peter K. Liaw, Junwei Qiao
Summary: This study successfully establishes a model for alloys with low stacking fault energies and predicts their failure threshold. It provides a new approach to further understand the serration mechanism and predict the failure threshold of multicomponent alloys.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Kuan Gao, Yuexin Chu, Weihua Zhou, Yong Tian, Yong Zhang, Yi Li
Summary: This study systematically investigates the phase inversion phenomenon in a high-Al-content B2 refractory high-entropy alloy (RHEA) through thermo-mechanical treatment. The grains of the single B2 phase transform inversely to the BCC+B2 microstructure with a dispersion of spherical B2 precipitates in the BCC grains. The phase inversion process enhances the tensile ductility of the RHEA while maintaining its high specific strength.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Qingwei Guo, Hua Hou, Kaile Wang, Muxi Li, Peter K. Liaw, Yuhong Zhao
Summary: This study proposes a multiparticle model based on molecular dynamics to investigate the coalescence kinetics during the hot-pressed sintering of a polycrystalline high-entropy alloy. The model accurately captures the accelerated occurrences of various phenomena and validates its feasibility by calculating the Young's modulus, which closely matches the experimental value.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ruixuan Li, Guihong Geng, Yong Zhang
Summary: High-entropy alloys (HEAs) have gained significant attention for their unique composition design and excellent properties, and the concept of entropy regulation has been widely used to develop performance-oriented alloys. Lightweight high-entropy alloys (LHEAs) are important lightweight materials that exhibit special properties due to high alloying elements and high mixing entropy, including high specific strength, high specific hardness, and excellent corrosion resistance. However, there are still unresolved questions regarding phase formation rules and comprehensive performance in specific service environments. This paper reviews the composition design, phase formation rules, mechanical properties, physical properties, and chemical properties of typical LHEAs, highlighting the challenges and future development directions.
MRS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Fusheng Tan, Li Li, Jia Li, Bin Liu, Peter K. Liaw, Qihong Fang
Summary: The harsh environment of nuclear reactors and flaws in existing materials have created a demand for new alloys. High-entropy alloys (HEAs) have gained attention for their potential in nuclear fields. Multiscale modelling has been used to study the irradiated properties of HEAs, deepening understanding and accelerating the development of irradiation-resistant HEAs. This review introduces the state-of-the-art multiscale modelling used for studying the irradiated properties of HEAs and summarizes representative irradiation-induced microstructures, properties, and damage. By strengthening the application of multiscale modelling, the rational design of high irradiation-resistant HEAs is expected.
ADVANCED POWDER MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dan Liu, Xi Jin, Huijun Yang, Junwei Qiao, Yong Zhang
Summary: The temperature sensitivity of cobalt-free high-entropy alloys Fe45Mn15Cr15Ni25 and Fe35Mn15Cr15Ni25Al10 was investigated. The addition of aluminum improves the mechanical properties and thermal stability of the alloys, but exacerbates the serration behavior.
Article
Materials Science, Multidisciplinary
Ruixuan Li, Baixue Bian, Gerhard Wilde, Yong Zhang, Sergiy V. Divinski
Summary: The tracer self-diffusion of Co in a compositionally complex AlCoCrFeNiTi0.2 alloy was measured using the radiotracer technique. The analysis of the complex multi-phase microstructure allowed for the determination of volume diffusion coefficients and grain boundary diffusion coefficients.
