Effect of stretching-bending deformation and aging treatment on phase transformation behavior and superelasticity of Ti-50.8 at.% Ni alloy

被引：20
作者：
Liu, Shan [1 ]
Zhu, Jie [1 ]
Lin, Yao [1 ]
Wang, Guangchun [1 ]
Wang, Xiebin [1 ,2 ]
机构：
[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Shandong, Peoples R China
[2] Shandong Univ, Suzhou Inst, Ruoshui Rd 388, Suzhou 215123, Peoples R China
来源：
INTERMETALLICS | 2021年 / 129卷
基金：
中国国家自然科学基金;
关键词：
Shape-memory alloys; NiTi; Martensitic transformation; Superelasticity; Heat treatment; Microstructure; SHAPE-MEMORY ALLOY; SEVERE PLASTIC-DEFORMATION; MARTENSITIC-TRANSFORMATION; FUNCTIONAL-PROPERTIES; MICROSTRUCTURE; TEMPERATURE; WIRES;
D O I：
10.1016/j.internet.2020.107051
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In order to improve the functional stability of Ti-50.8 at.% Ni alloys, a new plastic deformation method and device suitable for sheets or wires was developed in this work, called "stretching-bending deformation (SBD)". After SBD process, aging treatments were carried out at various temperatures (523-823 K) and various durations (0.5-12 h) to explore the effects of SBD process and aging treatment on the phase transformation behavior and superelasticity of NiTi alloys. The results indicate that the repeated stretching-bending process is an effective method to improve the functional stability of NiTi alloys, which introduces a certain amount of dislocations and refines the grain size from 9.1 mu m in as-annealed state to 3.2 mu m in the state after 15 SBD passes. After repeated SBD treatment, the martensitic transformation occurs in a wide temperature range, and the phase transformation peak becomes wider. Aging at 623 K for 0.5-1 h after 7 SBD passes helps to improve the functional stability. This is due to refined grains with an average grain size of 5.4 mu m and favorable dislocations introduced by SBD and nanoscaled Ni4Ti3 precipitates (<15 nm) induced by aging.
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页数：10
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