New approach to achieve high strength powder metallurgy Ti-6Al-4V alloy through accelerated sintering at β-transus temperature and hydrogenation-dehydrogenation treatment

SCRIPTA MATERIALIA

卷:130

Article

Cao, Fei¹  Chandran, K. S. Ravi¹  Kumar, Pankaj¹ 

[1] Univ Utah, Dept Met Engn, Salt Lake City, UT 84112 USA

关键词: Titanium;    Powder metallurgy;    Tensile strength;    Ductility;    Grain size;   

DOI  :  10.1016/j.scriptamat.2016.11.005

来源: Elsevier

【 摘 要 】

It is demonstrated that high density powder metallurgy (PM) Ti-6Al-4V alloy, with a finer prior-beta grain size, can be achieved by vacuum sintering of TiH2 compacts at the beta-transus (1010 degrees C) temperature, taking advantage of the accelerated self-diffusion. The subsequent refinement of the coarse lamellar microstructure by hydrogenation-dehydrogenation treatment produces a high tensile strength (similar to 1130 MPa) and ductile (similar to 10%) alloy. The superior tensile strength and ductility result from the nanoscale Widmanstatten structure and the finer prior-beta grain size, respectively, created by the two treatments. The results show a promising pathway to make high strength and ductile PM titanium alloys. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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