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Significant α-phase growth confinement in Grade 4 titanium and substantial β-phase refinement in Grade 7 titanium

Published online by Cambridge University Press:  28 November 2014

M. Yan ,
M. Qian ,
T.T. Song ,
M.S. Dargusch  and
X.S. Wei
M. Yan
Affiliation:
RMIT University, School of Aerospace, Mechanical and Manufacturing Engineering, Centre for Additive Manufacture, Melbourne, Victoria 3001, Australia Queensland Centre for Advanced Materials Processing and Manufacturing, The University of Queensland, Brisbane, Queensland 4072, Australia
M. Qian*
Affiliation:
RMIT University, School of Aerospace, Mechanical and Manufacturing Engineering, Centre for Additive Manufacture, Melbourne, Victoria 3001, Australia
T.T. Song
Affiliation:
RMIT University, School of Aerospace, Mechanical and Manufacturing Engineering, Centre for Additive Manufacture, Melbourne, Victoria 3001, Australia
M.S. Dargusch*
Affiliation:
Queensland Centre for Advanced Materials Processing and Manufacturing, The University of Queensland, Brisbane, Queensland 4072, Australia
X.S. Wei
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Melbourne, Victoria 3010, Australia
*
Address all correspondence to M. Qian, M.S. Dargusch at ma.qian@rmit.edu.au; m.dargusch@uq.edu.au
Address all correspondence to M. Qian, M.S. Dargusch at ma.qian@rmit.edu.au; m.dargusch@uq.edu.au
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Abstract

Significant α-phase growth confinement in Grade 4 titanium (Ti) and substantial β-phase refinement in Grade 7 Ti were observed during high-temperature annealing. The mechanism for each observation was identified through detailed microstructural investigation assisted with phase diagram analyses. The former observation was due to the pinning effect of Fe-stabilized grain boundary (GB) β-Ti phases in Grade 4 Ti. The latter observation resulted from the redistribution of Fe and, palladium (Pd) in particular, in Fe-stabilized and Pd-containing GB β-Ti phases in Grade 7 Ti. Pd was found to exist mainly in two forms in cold-rolled Grade 7 Ti, i.e. Fe-stabilized GB β-Ti phases and an occasionally observed orthorhombic Ti88Pd9Fe3 phase. The latter is close to the Ti2Pd3 intermetallic phase in terms of the crystal structure.

Type
Research Letters
Information
MRS Communications , Volume 4 , Issue 4 , December 2014 , pp. 183 - 188
Copyright
Copyright © Materials Research Society 2014 

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