Article
Chemistry, Physical
Asker Jarlov, Weiming Ji, Zhiguang Zhu, Yuanyuan Tian, Rita Babicheva, Ran An, Hang Li Seet, Mui Ling Sharon Nai, Kun Zhou
Summary: The correlation between the generalized stacking fault energy and the strengthening mechanisms of Cr-Fe-Co-Ni high-entropy alloys during uniaxial tensile deformation is investigated. The results show that the increase in Cr and Fe content decreases the generalized stacking fault energy while the Co and Ni content has the opposite effect. A linear correlation is identified between the unstable stacking fault energy and the yield stress. The composition of the alloy plays a crucial role in enhancing the yield strength and the efficiency of strengthening mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
Zan Li, Yin Zhang, Zhibo Zhang, Yi-Tao Cui, Qiang Guo, Pan Liu, Shenbao Jin, Gang Sha, Kunqing Ding, Zhiqiang Li, Tongxiang Fan, Herbert M. Urbassek, Qian Yu, Ting Zhu, Di Zhang, Y. Morris Wang
Summary: This study reports a strategy of dispersing nanoparticles in nanograins to simultaneously enhance and stabilize the properties of certain metals, such as strength, ductility, thermal stability, and electrical conductivity.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Hyun Chung, Dae Woong Kim, Woo Jin Cho, Heung Nam Han, Yuji Ikeda, Shoji Ishibashi, Fritz Kormann, Seok Su Sohn
Summary: High- and medium-entropy alloys with high solid-solution strength have significant effects on strain-hardening rate. In this study, the role of solid-solution strengthening on strain-hardening rate was revealed by controlling the Cr/V ratio in V1-xCrxCoNi alloys and investigating the evolution of deformation structures. The results showed that under the activated huge solid-solution strengthening effect, dislocation-mediated plasticity can be predominant over twinning, leading to an overall higher strain-hardening rate in the V-rich alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Review
Materials Science, Multidisciplinary
Lei Wang, Yichao Jiao, Ruifan Liu, Deyu Wang, Zhigang Yu, Yuntao Xi, Keren Zhang, Shanna Xu, Haitao Liu, Lei Wen, Xinke Xiao, Wei Zhang, Jiangtao Ji
Summary: This article introduces the mechanical properties of medium-entropy alloys under high temperature and high strain rate conditions, and discusses methods to improve their mechanical properties. It is of great significance for applications in aerospace and other fields.
Article
Materials Science, Multidisciplinary
Fangfang Xia, Yongpeng Chen, Dong Liang, Zeyin He
Summary: To investigate the fatigue behavior of steel or Ni-based superalloy, this study investigates the effects of temperature, vacancies, and void on the mechanical properties of M23C6 carbides using the molecular dynamics method. Additionally, the slip system that is most conducive to dislocation activity for M23C6 type carbides is identified based on the generalized stacking fault energy (GSFE) model. The results indicate that cleavage fracture is more likely to occur along the [110] direction for Fe23C6 and that void size affects the tensile stress curve along the [100] direction but has little effect on the stress curve along [110] and [111] directions.
Article
Physics, Applied
Tengfei Zheng, Jiecheng Lv, Yuan Wu, Hong-Hui Wu, Shaofei Liu, Jianguo Tang, Meisa Zhou, Hui Wang, Xiongjun Liu, Suihe Jiang, Zhaoping Lu
Summary: The study found that the stacking fault energy (SFE) of high entropy alloys decreases with an increase in Co concentration, favoring the formation of continuous stacking fault networks. The activation and complex interaction of multiple plastic deformation carriers are the main contributors to improved plasticity. Additionally, the increased presence of stair-rod dislocations in Co30Ni10Cr20Fe20Mn20 HEA results in enhanced strength.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Binglun Yin, Linhan Li, Sophie Drescher, Sascha Seils, Shankha Nag, Jens Freudenberger, W. A. Curtin
Summary: AuNi is a classic fcc alloy that combines a large atom (Au) and a small atom (Ni), resulting in high strengthening due to size misfits. Experimental tests on AuNi samples confirm its high yield strength and absence of segregation after annealing. Theoretical calculations based on first-principles DFT also predict a similar yield strength, showing that solute misfit plays a dominant role in strengthening the alloy. This study provides support for new strengthening theories and potential applications in complex concentrated alloys.
Article
Materials Science, Multidisciplinary
Prafull Pandey, Milan Heczko, Nikhil Khatavkar, Namrata Mazumder, Abhishek Sharma, Abhishek Singh, Michael J. Mills, Kamanio Chattopadhyay
Summary: This study reports an unprecedented precipitate shearing mechanism in CoNi-based superalloys at room temperature, which leads to significant work hardening rate. The observed twinning induced plasticity (TWIP) effect correlates with an excellent combination of yield strength, ultimate tensile strength (UTS) and plasticity. The deformation mechanism is directly correlated with the negative stacking fault energy of the matrix and low CSF energy of the gamma ' precipitates.
Article
Chemistry, Physical
Zhangrui Zhou, Lirong Liu, Peisen Lv, Jian Zhang
Summary: Two novel low-cost second-generation single crystal superalloys were designed by optimizing W and Re element compositions. The tensile properties and deformation mechanisms were systematically investigated at various temperatures. The results showed that the alloys exhibited outstanding tensile properties and showed great potential for application in advanced aero-engines.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
Yunqing Tang, D. Y. Li
Summary: This study investigates the ballistic resistances of two high-entropy alloys, CrMnFeCoNi and CrFeCoNi, and reveals that the presence of active dislocations generated at higher strain rates significantly contributes to their ability to resist high-speed deformation. The alloy with stronger atomic bonding and higher dislocation densities, CrFeCoNi, exhibits enhanced toughness and ballistic resistance compared to CrMnFeCoNi, which has weaker atomic bonding and is more prone to dislocation tangling.
Article
Chemistry, Physical
Peisen Lv, Lirong Liu, Guoqi Zhao, Shengdong Guo, Zhangrui Zhou, Yunsong Zhao, Jian Zhang
Summary: This work investigates the tensile properties and deformation mechanisms of a novel low-cost nickel-based single crystal superalloy containing 1.5 wt% Re. The alloy exhibits anomalous yielding behavior and undergoes double yield and strain softening at high temperatures. The main fracture mode transitions from pure shear to microvoid accumulation fracture with increasing temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Junheng Gao, Suihe Jiang, Haitao Zhao, Yuhe Huang, Huairuo Zhang, Shuize Wang, Guilin Wu, Yuan Wu, Honghui Wu, Albert Davydov, William Mark Rainforth, Zhaoping Lu, Xinping Mao
Summary: By massive nano-precipitation, the grain sizes of a near medium Mn austenitic steel were successfully refined, leading to a transition of deformation mechanism and achieving a unique combination of high strength and large elongation.
Article
Nanoscience & Nanotechnology
Suning Li, Philip J. Withers, Saurabh Kabra, Kun Yan
Summary: The microstructural evolution and deformation mechanisms of 316L stainless steel were studied at different temperatures using in situ neutron diffraction and transmission electron microscopy (TEM). It was found that the yield strength and ultimate tensile strength of the steel increase significantly at cryogenic temperatures. Deformation-induced martensitic transformation occurs at all cryogenic temperatures, accompanied by the appearance of e-martensite as an intermediate phase. The evolution of lattice strain, phase volume fraction, stacking fault probability, and stacking fault energy were quantified to investigate the correlation between deformation mechanisms and mechanical behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Peter J. Blau
Summary: Sliding wear damage on non-lubricated metallic bearing surfaces is caused by the dissipation of frictional work, presenting different damage features depending on alloy-specific deformation modes and microstructural properties. Metal pairs with similar friction coefficients may not wear equally due to differences in energy partition. The transition in wear mechanisms is influenced by composition and surface processing methods.
Article
Materials Science, Multidisciplinary
Christopher H. Zenk, Longsheng Feng, Donald McAllister, Yunzhi Wang, Michael J. Mills
Summary: The study investigates the shear process of Ni-base superalloy 718 at different temperatures and the deformation mechanisms of the co-precipitates. It reveals the presence of different intrinsic stacking faults in the gamma '' and gamma' phases, as well as offsetting of interfaces in the co-precipitates after shearing.
