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Deformation-induced ambient temperature α-to-β phase transition and nanocrystallization in (α + β) titanium alloy

Published online by Cambridge University Press:  31 January 2011

Yong Han ,
Huaye Zhuang  and
Jian Lu
Yong Han*
Affiliation:
State-Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
Huaye Zhuang
Affiliation:
State-Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China
Jian Lu
Affiliation:
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Kom, Kowloon, Hong Kong, China
*
a) Address all correspondence to this author. e-mail: yonghan@mail.xjtu.edu.cn
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Abstract

Ambient temperature α-to-β phase transition and nanocrystallization in the aged Ti–25Nb–3Mo–3Zr–2Sn titanium alloy was achieved by surface mechanical attrition treatment (SMAT). The phase transition occurs at α/β interfaces and extends to α phase interiors with increasing strain. It is irreversible and diffusion controlled. The stress-induced increase of Gibbs energy and enrichment of Nb may cause a high order of lattice instability of the α phase adjacent to the α/β interfaces and compel the α phase to β phase. The presence of fine α needles in the aged alloy and the phase transition from α to β with increasing strain are viewed to play a crucial role in the subsequent nanostructuring.

Keywords

NanostructurePhase transformationTi
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3439 - 3445
Copyright
Copyright © Materials Research Society 2009

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