Title: New approach to achieve high strength powder metallurgy Ti-6Al-4V alloy through accelerated sintering at β-transus temperature and hydrogenation-dehydrogenation treatment 文章编号: 20170001 作者:
关键词: Keywords: Titanium; Powder metallurgy; Tensile strength; Ductility; Grain size 文献标识码: 中图分类号: EMAIL: 摘要: Abstract: 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 ℃) 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. 页码: 22-26
