Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:552

Article

Dehghan-Manshadi, Ali¹  Dippenaar, Rian J.¹ 

[1] Univ Wollongong, Fac Engn, Wollongong, NSW 2500, Australia

关键词: Thermo-mechanical processing;    Strain-induced phase transformation;    Titanium alloys;    Grain refinement;   

DOI  :  10.1016/j.msea.2012.05.069

来源: Elsevier

【 摘 要 】

Strain-induced phase transformation studies have been conducted in a Ti-6Al-2Sn-4Zr-6Mo alloy. This alloy was subjected to beta sub-transus deformation upon slow cooling from the beta-phase field and the effect of strain on the extent and morphology of the phase transformation during hot-deformation was determined. In addition, the transformation kinetics and the morphology of the newly formed alpha-phase were studied following deformation under different cooling conditions. By applying strain, the rate of the beta-to-alpha phase transformation increased significantly during deformation as well as during slow cooling following deformation. This increase in the kinetics of the beta-to-alpha transformation can be ascribed to strain-induced phase transformation. Also, the extent of deformation of the beta-phase had a marked effect on the resulting morphology and size of the newly formed alpha-phase. Transformation of un-deformed beta-phase rendered alpha-phase of acicular morphology only. However, following deformation of the beta-phase, acicular as well as globular alpha-phase morphologies have been observed upon cooling. (c) 2012 Elsevier B.V. All rights reserved.

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