Matrials Science and Engineering A, ( ISI ), Volume (662), No (1), Year (2016-3) , Pages (564-577)

Title : ( The effect of annealing on themechanical properties and microstructural evolution of Ti-rich NiTi shape memory alloy )

Authors: Ghazal Tadayyon , Mohammad Mazinani , Yina Guo , Seyed Mojtaba Zebarjad , Syed A.M. Tofail , Manus J. Biggs ,

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Abstract

An investigation was carried out into the influence of the annealing temperatures on the thermo- mechanical behavior of Ti-rich NiTi alloy with regard to transformation temperatures, mechanical properties at room temperature and microstructure evolution under deformation. It was found that annealing above the recrystallization temperature (600 °C) modulated the mechanical behavior of the alloy significantly. Based on tensile and DSC analysis, it was observed that by increasing the annealing temperature, the shape memory behavior of the alloys improved. Scanning and transmission electron microscopy were used to investigate the fracture surfaces and microstructural evolution of the NiTi samples after failure. Fractography revealed the brittle fracture area produced through the propagation of cleavage cracks; however, ductile fracture via nucleation growth and coalescence of micro-dimples in the martensitic phase at room temperature were also observed. During plastic deformation, the NiTi alloy was also observed to undergo a detwinning process, dislocation slip and the formation of submicrocrystalline grains, nanocrystallization and amorphous bands.

Keywords

, NiTi shape memory alloy, Heat treatment, Plastic deformation, Fracture, Transmission electron microscopy
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@article{paperid:1055715,
author = {Tadayyon, Ghazal and Mazinani, Mohammad and Yina Guo and Seyed Mojtaba Zebarjad and Syed A.M. Tofail and Manus J. Biggs},
title = {The effect of annealing on themechanical properties and microstructural evolution of Ti-rich NiTi shape memory alloy},
journal = {Matrials Science and Engineering A},
year = {2016},
volume = {662},
number = {1},
month = {March},
issn = {0921-5093},
pages = {564--577},
numpages = {13},
keywords = {NiTi shape memory alloy; Heat treatment; Plastic deformation; Fracture; Transmission electron microscopy},
}

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%0 Journal Article
%T The effect of annealing on themechanical properties and microstructural evolution of Ti-rich NiTi shape memory alloy
%A Tadayyon, Ghazal
%A Mazinani, Mohammad
%A Yina Guo
%A Seyed Mojtaba Zebarjad
%A Syed A.M. Tofail
%A Manus J. Biggs
%J Matrials Science and Engineering A
%@ 0921-5093
%D 2016

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