The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti50Ni40Cu10 Shape Memory Alloy by Dynamic Mechanical Analyzer

被引：3
|
作者：
Lin, Kai-Nan [2 ]
Wu, Shyi-Kaan [1 ,2 ]
Tsai, Chia-Liang [2 ]
机构：
[1] Natl Taiwan Univ, Dept Mech Engn, Taipei 106, Taiwan
[2] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 106, Taiwan
来源：
MATERIALS TRANSACTIONS | 2008年 / 49卷 / 12期
关键词：
shape memory alloy; thermal cycling; internal friction; martensitic transformation; dynamic mechanical analysis;
D O I：
10.2320/matertrans.MRA2008123
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of thermal cycling on B2 -> B19 -> B19' transformations of cold-rolled and annealed Ti50Ni40Cu10 SMA was examined by DMA. Experimental results point out the transformation peak temperature and its tan delta peak value of B19 -> B19' transformation are more suppressed by thermal cycling than those of B2 -> B19. This is because of the different microstructures between B19 and B19' martensites in which B 19 is a defect-free martensite but B19' has plenty of twinning. Dislocations induced by thermal cycling can hinder the mobility of twin boundaries of B19' martensite and cause different thermal cycling effects on B2 -> B19 and B19 -> B19' transformations. Thermal cycling also shows an obvious effect on storage modulus E-0 values of B19 and B19' martensites and their E-0 values increase with increasing thermal cycles. [doi: 10.2320/matertrans.MRA2008123]
引用
收藏
页码：2776 / 2780
页数：5
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