FCC-BCC phase transformation induced simultaneous enhancement of tensile strength and ductility at high strain rate in high-entropy alloy

IF 9.4 1区 材料科学 Q1 ENGINEERING, MECHANICAL
Yong-Chao Wu , Jian-Li Shao
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引用次数: 3

Abstract

FCC-BCC phase transformation-induced plasticity (TRIP) has been extensively studied in high-entropy alloys (HEAs) to customize their mechanical properties through compression/tension loading or thermal fabrication processes. In this study, we employed a combination of molecular dynamics (MD) and Monte-Carlo (MC) simulations to investigate the effects of TRIP on the uniaxial strain tensile deformation of Co25Ni25Fe25Al7.5Cu17.5 HEA. Our results demonstrate that a complete FCC-BCC phase transformation occurs, in accordance with the N-W relationship, resulting in a simultaneous enhancement of strength and ductility. This is attributed to the HEA's significantly low stacking fault energy and pronounced lattice distortion (LD). However, short-range order (SRO) acts as an obstacle on atomic sliding, which further reduces the degree of phase transformation, leading to an increase in Young's modulus but a decrease in ductility. Furthermore, an increase in strain rate can promote the occurrence of the phase transformation to a certain extent but also leads to an increase in the degree of disorder defects. We also found that the HEA maintains excellent thermal stability up to 900 K, but the amount of phase transformation decreases with increasing initial temperature. Our systematic study of FCC-BCC transformation, considering the effects of SRO, LD, strain rate, and temperature, provides insights into tailoring the mechanical properties of HEAs for practical design purposes.

Abstract Image

FCC-BCC相变诱导高熵合金在高应变速率下拉伸强度和塑性同时增强
FCC-BCC相变诱导塑性(TRIP)在高熵合金(HEAs)中得到了广泛的研究,以通过压缩/拉伸加载或热制造工艺定制其力学性能。本研究采用分子动力学(MD)和蒙特卡罗(MC)模拟相结合的方法研究了TRIP对Co25Ni25Fe25Al7.5Cu17.5 HEA单轴应变拉伸变形的影响。我们的研究结果表明,根据N-W关系,发生了完全的FCC-BCC相变,从而同时提高了强度和延性。这是由于HEA的层错能明显较低,晶格畸变(LD)明显。然而,短程有序(SRO)作为原子滑动的障碍,进一步降低了相变程度,导致杨氏模量增加,但塑性降低。此外,应变速率的增加在一定程度上促进相变的发生,但也会导致缺陷无序程度的增加。在900 K温度下,HEA仍保持良好的热稳定性,但相变量随着初始温度的升高而减小。我们对FCC-BCC转换的系统研究,考虑了SRO、LD、应变速率和温度的影响,为为实际设计目的量身定制HEAs的力学性能提供了见解。
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来源期刊
International Journal of Plasticity
International Journal of Plasticity 工程技术-材料科学:综合
CiteScore
15.30
自引率
26.50%
发文量
256
审稿时长
46 days
期刊介绍: International Journal of Plasticity aims to present original research encompassing all facets of plastic deformation, damage, and fracture behavior in both isotropic and anisotropic solids. This includes exploring the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena. Topics of interest span the plastic behavior of single crystals and polycrystalline metals, ceramics, rocks, soils, composites, nanocrystalline and microelectronics materials, shape memory alloys, ferroelectric ceramics, thin films, and polymers. Additionally, the journal covers plasticity aspects of failure and fracture mechanics. Contributions involving significant experimental, numerical, or theoretical advancements that enhance the understanding of the plastic behavior of solids are particularly valued. Papers addressing the modeling of finite nonlinear elastic deformation, bearing similarities to the modeling of plastic deformation, are also welcomed.
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