Molecular Dynamics Investigation on Grain Size-Dependent Superelastic Behavior of CuZr Shape Memory Alloys

被引：0

作者：

Zhu, Mixun ^{[1
]}

Wang, Kai ^{[1
]}

Zhong, Hongtao ^{[1
]}

Shen, Huahuai ^{[1
]}

Zhang, Yong ^{[2
]}

Fu, Xiaoling ^{[1
]}

Yang, Yuanzheng ^{[1
]}

机构：

[1] Guangdong Univ Technol, Sch Mat & Energy, Guangzhou 510006, Peoples R China

[2] Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, 30 Xueyuan Rd, Beijing 100083, Peoples R China

来源：

METALS | 2025年 / 15卷 / 02期

基金：

中国国家自然科学基金;

关键词：

shape memory alloys; superelasticity; grain size effects; irrecoverable strain; phase transformation; molecular dynamics; NANOSCALE PHASE-TRANSITION; MARTENSITIC-TRANSFORMATION; NITI; IMPACT;

D O I：

10.3390/met15020142

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The superelasticity of CuZr shape memory alloys (SMAs) originates from stress-induced transformations between the B2 (austenite) and B19' (martensite) phases. Grain size is a key parameter affecting the superelasticity of shape memory alloys. Previous studies on NiTi, Fe-based, and Cu-based SMAs confirm that altering grain size effectively regulates superelasticity. Current research on the influence of grain size on the superelasticity of CuZr shape memory alloys (SMAs) is relatively sparse. This study employs molecular dynamics simulations to evaluate the effect of grain size on the superelasticity of CuZr SMAs through uniaxial loading-unloading tests. Polycrystalline samples with grain sizes of 6.59 nm, 5 nm, and 4 nm were analyzed. The results indicate that reducing grain size can decrease the irrecoverable strain, thereby enhancing superelasticity. The improvement in superelasticity is attributed to a higher recovery rate of the martensite-to-austenite transformation, allowing more plastic deformation within the grain interior to recover during unloading, and thereby reducing the irrecoverable strain. The recovery rate of the martensite-to-austenite transformation is closely related to the elastic strain energy accumulated within the grain interior during loading.

引用

页数：14

共 53 条

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