Inherent internal friction of B2 → R and R → B19′ martensitic transformations in equiatomic TiNi shape memory alloy

SCRIPTA MATERIALIA

卷:55

Article

Chang, S. H. ; Wu, S. K.

关键词: shape memory alloys (SMA);    martensitic phase transformation;    internal friction;    dynamic mechanical analysis;   

DOI  :  10.1016/j.scriptamat.2006.04.044

来源: Elsevier

【 摘 要 】

The inherent internal frictions IFPTB2 -> R + IFI and IFPTR -> B19' + IFI of Ti50Ni50 alloy are studied under isothermal conditions. The tan delta values of IFPTB2 -> R + IFI and IFPTR -> B19' + IFI are both proportional to sigma(0)/upsilon(1/2) and thus the damping mechanism of IFPTB2 -> R IFI and IFPTR -> B19' + IFI is related to the stress-assisted martensitic transformation and stress-assisted motions of twin boundary. PTThe tan delta value of IFPTR -> B19' + IFI is larger than that of IFPTB2 -> R + IFI because of the larger transformation strain and the greater twin boundaries associated with the R -> B19' transformation. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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