New approach to achieve high strength powder metallurgy Ti-6Al-4V alloy through accelerated sintering at β-transus temperature and hydrogenation-dehydrogenation treatment
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- 作者：Fei Cao ; K.S. Ravi Chandran ; ravi.chandran@utah.edu ; Pankaj Kumar
- 关键词：Titanium ; Powder metallurgy ; Tensile strength ; Ductility ; Grain size
- 刊名：Scripta Materialia
- 出版年：2017
- 出版时间：15 March 2017
- 年：2017
- 卷：130
- 期：Complete
- 页码：22-26
- 全文大小：1248 K
- 卷排序：130
文摘
It is demonstrated that high density powder metallurgy (PM) Ti-6Al-4V alloy, with a finer prior-β grain size, can be achieved by vacuum sintering of TiH2 compacts at the β-transus (1010 °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 (~ 1130 MPa) and ductile (~ 10%) alloy. The superior tensile strength and ductility result from the nanoscale Widmanstatten structure and the finer prior-β grain size, respectively, created by the two treatments. The results show a promising pathway to make high strength and ductile PM titanium alloys.