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.
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页数：9
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