Molecular dynamics study on the microstructure evolution of Ti2AlNb-based alloy subjected to tensile pre-strain and electric current treatment
点击次数：
影响因子：3.5
DOI码：10.1007/s10853-024-10524-8
所属单位：Hefei University of Technology
发表刊物：Journal of Materials Science
项目来源：National Natural Science Foundation of China
关键字：Ti2AlNb-based alloy; Twin boundary; Molecular dynamics; Electron-wind force; Phase transformation
摘要：In this study, molecular dynamic simulation was used to investigate the evolution of microstructure and dislocation configuration of pre-strain Ti2AlNb-based alloy under electric current treatment (ECT). Three bicrystal models embedded with equiaxed α2 particle with different initial orientations and three tensile pre-strain (ε=0.021, 0.08 and 0.106) were built, and the equivalent electron-wind force was applied on each model to indirectly simulate the athermal electroplastic effect. The results show that the ECT increases the proportion of BCC phase by up to 30% except for the ε=0.021 condition and eliminates the sub-grain boundaries formed during pre-straining. The increasing dislocation density in BCC structure and opposite situation in HCP structure narrows the gap in electric conductivity between the BCC phase and the HCP one and the decreased external electric energy input, and therefore decelerates the HCP→BCC phase transformation until reaching an equilibrium state with the proceeding of ECT process. Moreover, the electron-wind force induces annihilation in defect-rich areas and activates the merging of partial dislocations. It also brings about local stress concentration on phase boundary and promotes [[EQUATION]] and [[EQUATION]] twin variants. This work helps to deepen the understanding of pure electroplastic effect in titanium alloys during ECT process.
合写作者：Zi-long Liu,Yong-qiang Zhang,Xiao-li Zhang,Ke-min Xue
第一作者：严思梁
论文类型：期刊论文
通讯作者：孟淼
学科门类：工学
文献类型：J
卷号：60
页面范围：300-315
是否译文：否
发表时间：2025-01-07
收录刊物：SCI、EI
发布期刊链接：https://link.springer.com/article/10.1007/s10853-024-10524-8
附件：
上一条： Atomic-scale insights into the strength and plasticity enhancement of Ni-based superalloys with refinement dispersion of precipitates
下一条： Unconventional mechanical responses and mechanisms of Ti-6Al-4V sheet subjected to electrically-assisted cyclic loading-unloading: thermal and athermal effects