Direct-Current-Assisted Healing for Functional Degradation of Nanocrystalline Superelastic NiTi Shape Memory Alloys

被引：2

作者：

Ju, Shuangyan ^{[1
]}

Xiao, Yao ^{[2
]}

Lin, Jianping ^{[1
]}

Gao, Liming ^{[3
]}

Chen, Dailu ^{[1
]}

Lu, Zeyang ^{[1
]}

Fang, Cheng ^{[4
,5
]}

Min, Junying ^{[1
]}

机构：

[1] Tongji Univ, Sch Mech Engn, Shanghai 201804, Peoples R China

[2] Tongji Univ, Inst Adv Study, Shanghai 200092, Peoples R China

[3] Tongji Univ, Shanghai East Hosp, Dept Cardiovasc Med, Sch Med, Shanghai 200120, Peoples R China

[4] Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China

[5] Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2023年 / 54卷 / 12期

基金：

中国国家自然科学基金;

关键词：

PULSED ELECTRIC-CURRENT; PHASE-TRANSFORMATIONS; DEFORMATION; BEHAVIOR;

D O I：

10.1007/s11661-023-07226-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A direct-current-assisted (DC-assisted) healing method is proposed to deal with the functional degradation of nanocrystalline superelastic NiTi shape memory alloys. Based on microstructural observation, we clarify that DC-assisted healing is mainly attributable to the elimination of residual martensite and transformation-induced dislocations via Joule effect. The proposed healing strategy is suitable for nanocrystalline samples with small grain size (less than similar to 30 nm) and high initial dislocation density (similar to 1 x 10(16) m(-2)), and the appropriate healing parameters are determined.

引用

页码：4625 / 4633

页数：9

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