Microstructure and Properties of 3.5 vol.%TiBw/Ti6A14V Composite Tubes Fabricated by Hot-hydrostatic Extrusion
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第7期
论文作者:Wencong Zhang Xueyan Jiao Yang Yu Jianlei Yang Yangju Feng
文章页码:710 - 714
摘 要:Tubes of 3.5 vol.%TiB whiskers reinforced Ti6AI4 V matrix composites(TiBw/Ti6AI4V) were successfully fabricated by a two-step hot-hydrostatic extrusion process:β extrusion at 1100 ℃ and subsequent near-βextrusion at 950 ℃.The dimensions of tubes were about 7 mm in diameter and 2 mm in thickness.A refined basket-weave structure in Ti6AI4 V matrix was achieved at ambient temperature after the extrusion process.Besides,the original network structure formed by TiB whiskers synthesized was broken,while the TiB whiskers were preferentially aligned in the extruding direction.Meanwhile,a fibrous texture was evolved finally,resulting from partial dynamic recrystallization during the β extrusion and the involvement of a phase during the near-β extrusion.The tensile and compressive tests results showed that both the strength and ductility of the tubes were significantly improved.In particular,the tubes exhibited good mechanical properties at elevated temperatures.
Wencong Zhang,Xueyan Jiao,Yang Yu,Jianlei Yang,Yangju Feng
School of Materials Science and Engineering,Harbin Institute of Technology at Weihai
摘 要:Tubes of 3.5 vol.%TiB whiskers reinforced Ti6AI4 V matrix composites(TiBw/Ti6AI4V) were successfully fabricated by a two-step hot-hydrostatic extrusion process:β extrusion at 1100 ℃ and subsequent near-βextrusion at 950 ℃.The dimensions of tubes were about 7 mm in diameter and 2 mm in thickness.A refined basket-weave structure in Ti6AI4 V matrix was achieved at ambient temperature after the extrusion process.Besides,the original network structure formed by TiB whiskers synthesized was broken,while the TiB whiskers were preferentially aligned in the extruding direction.Meanwhile,a fibrous texture was evolved finally,resulting from partial dynamic recrystallization during the β extrusion and the involvement of a phase during the near-β extrusion.The tensile and compressive tests results showed that both the strength and ductility of the tubes were significantly improved.In particular,the tubes exhibited good mechanical properties at elevated temperatures.
关键词: