Adjustment of Aging Temperature for Reaching Superelasticity in Highly Ni-Rich Ti-51.5Ni NiTi Shape Memory Alloy

被引：21
|
作者：
Karimzadeh, M. [1 ]
Aboutalebi, M. R. [1 ]
Salehi, M. T. [1 ]
Abbasi, S. M. [2 ]
Morakabati, M. [2 ]
机构：
[1] Iran Univ Sci & Technol, Ctr Excellence High Strength Alloys Technol, Tehran, Iran
[2] Maleke Ashtar Univ Technol, Metall Mat Res Ctr, Tehran, Iran
来源：
MATERIALS AND MANUFACTURING PROCESSES | 2016年 / 31卷 / 08期
关键词：
Transformation; Mechanical; Superelasticity; Deformation; Pseudoelasticity; Properties; Martensitic; Aging; MULTISTAGE MARTENSITIC-TRANSFORMATION; TENSION-COMPRESSION ASYMMETRY; STRESS-STRAIN RESPONSE; TI-50.9 AT.PERCENT NI; AGED SINGLE-CRYSTAL; PHASE-TRANSFORMATION; MECHANICAL-PROPERTIES; R-PHASE; THERMOMECHANICAL TREATMENT; POLYCRYSTALLINE NITI;
D O I：
10.1080/10426914.2015.1048468
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this research, the effects of aging temperature on the phase transformation, mechanical properties, and superelasticity of Ti-51.5 at.% Ni alloy were investigated. For this purpose, samples were solution annealed and then aged at different temperatures ranging from 300 to 700 degrees C. The results showed that the change of aging temperature has a great influence on the behavior of the alloy. Aging at 300 and 400 degrees C led to the occurrence of the austenite to R phase (A <-> R) transformation. By aging at these temperatures, the ultimate tensile strength and elongation did not change significantly compared to the solution annealed sample. Aging at 500 and 600 degrees C led to the appearance of B19 ' phase during cooling cycle of differential scanning calorimetry tests. Samples aged at 500 and 600 degrees C showed the best mechanical properties, in comparison with the other aging temperatures. Maximum tensile strength of 1250MPa and the elongation of 25% were obtained by aging at 500 and 600 degrees C, respectively. Solution-annealed sample showed no superelastic property. Complete superelasticity was observed by aging at 400 and 500 degrees C. The sample aged at 700 degrees C showed the transformation behavior and mechanical properties similar to the solution annealed sample.
引用
收藏
页码：1014 / 1021
页数：8
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