High yield stress and narrow phase transformation hysteresis of thermomechanical-processing NiTiCu shape memory alloy

被引：6

作者：

Sun, Dong ^{[1
]}

Jiang, Shuyong ^{[1
,2
]}

Lin, Peng ^{[2
]}

Yan, Bingyao ^{[1
]}

Feng, Hao ^{[1
]}

Tang, Ming ^{[3
]}

Zhang, Yanqiu ^{[3
]}

机构：

[1] Taiyuan Univ Technol, Engn Res Ctr Adv Met Composites Forming Technol &, Minist Educ, Taiyuan 030024, Peoples R China

[2] Taiyuan Univ Technol, Coll Mat Sci & Engn, Taiyuan 030024, Peoples R China

[3] Harbin Engn Univ, Coll Mech & Elect Engn, Harbin 150001, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 897卷

基金：

中国国家自然科学基金;

关键词：

Shape memory alloys; NiTiCu; Yield stress; Phase transformation; Twin; SEVERE PLASTIC-DEFORMATION; SPUTTERED THIN-FILMS; NI-TI; MARTENSITIC-TRANSFORMATION; MICROSTRUCTURE; EVOLUTION; BEHAVIOR; TI-X(NI; CU)(1-X); SUPERELASTICITY; RECOVERABILITY;

D O I：

10.1016/j.msea.2024.146340

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

NiTiCu shape memory alloy is subjected to thermomechanical processing which deals with local canning compression followed by annealing at 300, 450 and 600 degrees C, respectively. Transformation temperatures of annealed NiTiCu specimens increase with elevating annealing temperature. Following annealing at 300 degrees C, NiTiCu specimen exhibits high yield stress of about 2000 MPa due to the existence of nanocrystalline grains. NiTiCu sample annealed at 600 degrees C possesses an extremely narrow phase transformation hysteresis width of about 1 degrees C. Nanotwins are found in NiTiCu sample annealed at 300 degrees C, while a large number of twin variants appear in NiTiCu samples annealed at 450 and 600 degrees C. Nanocrystalline grains contribute to suppressing the occurrence of twin variants. Furthermore, nanocrystalline grains are not beneficial to the formation of martensite variants. In the case of compressive loading, martensite reorientation and detwinning take place more readily in NiTiCu samples annealed at 450 and 600 degrees C.

引用

页数：14

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