Exceptional fatigue resistant NiTi wire mediated by R-phase

被引：7

作者：

Zhao, Yang ^{[1
]}

Yu, Zunyue ^{[1
]}

Ren, Xuepeng ^{[1
]}

Wang, Qianyu ^{[1
]}

Zhang, Beibei ^{[2
]}

Chen, Jianhao ^{[3
]}

Xu, Wei ^{[3
]}

Ren, Shubin ^{[1
]}

Qu, Xuanhui ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing Adv Innovat Ctr Mat Genome Engn, Beijing 100083, Peoples R China

[2] HEYE Special Steel Co Ltd, Shijiazhuang 052165, Peoples R China

[3] Deakin Univ, Sch Engn, Waurn Ponds, Vic 3216, Australia

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 169卷

基金：

中国国家自然科学基金;

关键词：

NiTi alloy; Microstructure; R; -phase; Fatigue performance; Fracture mechanism; SHAPE-MEMORY ALLOYS; SUPERELASTIC NITI; CYCLIC DEFORMATION; TRANSFORMATION; BEHAVIOR; TEMPERATURE; MECHANISMS;

D O I：

10.1016/j.ijfatigue.2022.107494

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Ni50.2Ti49.8 and Ni50.9Ti49.1 wires in cold-drawn state were compared regarding tensile fatigue life and fatigue fracture mechanism. Through process control, Ni50.2Ti49.8 with R-phase matrix at room temperature was ach-ieved in as-drawn state without post heat treatment. The R-phase imparts exceptional fatigue performance to Ni50.2Ti49.8 wire with fatigue life approximately twelve times of that for Ni50.9Ti49.1 which comprises B2 phase and a small amount of B19 ' under the same test conditions. The cyclic phase transformation under loading initiates microcracks in phase boundaries, leading to premature fracture of Ni50.9Ti49.1. In contrast, the R-phase presents exceptional stability against fatigue failure upon cyclic loading.

引用

页数：9

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