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

被引：55

作者：

Cao, Fei ^{[1
]}

Chandran, K. S. Ravi ^{[1
]}

Kumar, Pankaj ^{[1
]}

机构：

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

来源：

SCRIPTA MATERIALIA | 2017年 / 130卷

关键词：

Titanium; Powder metallurgy; Tensile strength; Ductility; Grain size; TENSILE FRACTURE; VOID FORMATION; TITANIUM; GROWTH; DIFFUSION; MECHANISM;

D O I：

10.1016/j.scriptamat.2016.11.005

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

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.

引用

页码：22 / 26

页数：5

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