Grain size effect on the martensitic transformation temperatures of nanocrystalline NiTi alloy

被引：38
作者：
Shi, X. B. [1 ,2 ]
Ma, Z. Y. [2 ]
Zhang, J. S. [2 ,3 ]
Ding, H. L. [1 ]
Guo, F. M. [2 ]
Liu, Y. [4 ]
Cui, L. S. [2 ]
机构：
[1] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Peoples R China
[2] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Changping, Peoples R China
[3] Jiangsu Univ, Inst Adv Mat, Zhenjiang 212013, Peoples R China
[4] Univ Western Australia, Sch Mech & Chem Engn, Crawley, WA 6009, Australia
来源：
SMART MATERIALS AND STRUCTURES | 2015年 / 24卷 / 07期
关键词：
shape memory alloys; nanocrystalline; martensitic transformation; PHASE-TRANSFORMATION; MEMORY; BEHAVIOR; PSEUDOELASTICITY; STRESS;
D O I：
10.1088/0964-1726/24/7/072001
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The grain size effect on B19' martensitic transformation temperatures of a nanocrystalline Ti-50.2 at%Ni alloy was investigated by differential scanning calorimetry (DSC) analysis and (TEM) observation. It was found that the R -> B19' transformation temperature decreases with decreasing grain size in the range of 50-150 nm, whilst the reverse B19' -> R transformation temperature remains independent of grain size, leading to an increase of the hysteresis with decreasing grain size. The observed effects of grain size on the characteristics of the R <-> B19' transformation are attributed to variations of both the elastic and the irreversible energies of the martensitic transformation in the nanograin regime.
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页数：5
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