Internal friction of B2→B19′ martensitic transformation of Ti50Ni50 shape memory alloy under isothermal conditions

被引：37

作者：

Chang, S. H. ^{[1
]}

Wu, S. K. ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei 106, Taiwan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 454卷

关键词：

TiNi shape memory alloy; martensitic transformation; internal friction; dynamic mechanical analysis;

D O I：

10.1016/j.msea.2006.11.157

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The inherent internal friction (IFPT + IFI)(B2)->(B19') of cold-rolled and annealed Ti50Ni50 alloy that exhibits B2 -> B19' martensitic transformation is studied under isothermal conditions. The tan delta value of (IFPT + IFI)(B2 -> B19') is proportional to sigma(0)/nu(1/2) and its damping mechanism is thus related to stress-assisted martensitic transformation and stress-assisted motion of twin boundaries. The tan delta value of (IFPT + IFI)(B2 -> B19') is smaller than those of (IFPT + IFI)(B2 -> R) and (IFPT + IFI)(R -> B19)' because the former shows no R-phase. The obliterated dislocations and defects after sufficient annealing can lower the tan 3 value of the relaxation peak at about -60 degrees C. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：379 / 383

页数：5

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