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Mechanical properties and tensile fracture of Ti–Al–V alloy strip under electropulsing-induced phase change

Published online by Cambridge University Press:  15 December 2014

Xiaoxin Ye ,
Zion T.H. Tse  and
Guoyi Tang
Xiaoxin Ye*
Affiliation:
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China; and Key Laboratory for Advanced Materials of Ministry of Education, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Zion T.H. Tse
Affiliation:
College of Engineering, The University of Georgia, Athens, Georgia 30602, USA
Guoyi Tang*
Affiliation:
Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China; and Key Laboratory for Advanced Materials of Ministry of Education, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
*
a) Address all correspondence to this author. e-mail: guoyitangforwork@163.com
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Abstract

The effect of high-energy electropulsing treatment (EPT) on the microstructure evolution, mechanical properties, and fracture behavior of as-treated Ti–6Al–4V alloy strips was investigated. EPT was found to accelerate phase transition and microstructure evolution of quasi-single-phase titanium alloy strips at a relatively low temperature, and obtain characteristic duplex microstructure and Widmanstatten microstructure. The EPT-induced microstructural changes increased elongation-to-failure remarkably with a slight decrease in tensile strength. Fracture surface observation and three-dimensional analysis showed that transition from small-shallow dimple colony to big-deep colony fracture took place with an increase in frequency of EPT. The rapid phase change of the Ti–6Al–4V alloy strip under EPT was attributed to the enhancement of nucleation rate and atomic diffusion resulting from the coupling of the thermal and athermal effects. It is supposed that EPT can provide a highly efficient method for the intermediate-softening annealing of titanium alloy sheet/strips.

Keywords

titanium alloyelectropulsing treatmentphase changemicrostructure evolutionmechanical propertiesfracture behavior

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Type
Articles
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Journal of Materials Research , Volume 30 , Issue 2 , 28 January 2015 , pp. 206 - 223
Copyright
Copyright © Materials Research Society 2015 

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