Inherent internal friction of B2 → R and R → B19′ martensitic transformations in equiatomic TiNi shape memory alloy
Journal
Scripta Materialia
Journal Volume
55
Journal Issue
4
Pages
311-314
Date Issued
2006
Author(s)
Abstract
The inherent internal frictions IFPTB 2 → R + IFI and IFPTR → B 19′ + IFI of Ti50Ni50 alloy are studied under isothermal conditions. The tan δ values of IFPTB 2 → R + IFI and IFPTR → B 19′ + IFI are both proportional to σ0/υ1/2 and thus the damping mechanism of IFPTB 2 → R + IFI and IFPTR → B 19′ + IFI is related to the stress-assisted martensitic transformation and stress-assisted motions of twin boundary. The tan δ value of IFPTR → B 19′ + IFI is larger than that of IFPTB 2 → R + IFI because of the larger transformation strain and the greater twin boundaries associated with the R → B19′ transformation. © 2006 Acta Materialia Inc.
Type
journal article