Effect of different stages of deformation on the microstructure evolution of Ti-rich NiTi shape memory alloy

被引：53

作者：

Tadayyon, Ghazal ^{[1
,2
]}

Guo, Yina ^{[3
]}

Mazinani, Mohammad ^{[1
]}

Zebarjad, Seyed Mojtaba ^{[4
]}

Tiernan, Peter ^{[3
]}

Tofail, Syed A. M. ^{[3
]}

Biggs, Manus J. P. ^{[2
]}

机构：

[1] Ferdowsi Univ Mashhad, Fac Engn, Dept Met & Mat Engn, Mashhad, Iran

[2] Natl Univ Ireland, Ctr Res Med Devices CURAM, Galway, Ireland

[3] Univ Limerick, Mat & Surface Sci Inst, Limerick, Ireland

[4] Shiraz Univ, Sch Engn, Dept Mat Sci & Engn, Shiraz, Iran

来源：

MATERIALS CHARACTERIZATION | 2017年 / 125卷

基金：

爱尔兰科学基金会;

关键词：

NiTi shape memory alloys; Detwinning; Plastic deformation mechanisms; Strain burst; Transmission electron microscopy; SEVERE PLASTIC-DEFORMATION; STACKING-FAULT ENERGY; MARTENSITIC-TRANSFORMATION; TEMPERATURE; BEHAVIOR;

D O I：

10.1016/j.matchar.2017.01.024

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The main objective of this work was to investigate the thermomechanical behavior and microstructural changes of a Ti-rich NiTi shape memory alloy (SMA). The microstructural and texture evolution of aged NiTi alloy at different degrees of deformation were elicited by transmission electron microscopy (TEM). An effort was made to correlate results obtained from the tensile test with results from microstructure studies. The undeformed sample reveals a self-accommodated morphology with straight and well defined twin boundaries. At different stages of deformation, diverse mechanisms were involved. These mechanisms include marstraining, detwinning accompanied by dislocation movement, and finally, severe plastic deformation, subdivision and amorphization of the matrix. Under increasing strains, high density lattice defects were generated and the morphology of B19' became disordered. (C) 2017 Elsevier Inc. All rights reserved.

引用

页码：51 / 66

页数：16

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