Microstructure of a Ti-50 wt％ Ta alloy produced via laser powder bed fusion

• 作者: Cong-Cong Zhao Hao Chen Lei-Lei Xing Wei Liu Zhi-Jian Shen
• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2020,（7）
• 页码范围: 981-990
• 页数: 10页
• 语种: 英文

摘要

Ti-Ta alloys have been widely studied for biomedical applications due to their high biocompatibility and corrosion resistance.In this work,nearly fully dense and in situ alloyed Ti-50 wt％ Ta samples were fabricated by the laser powder bed fusion (LPBF) of mechanically mixed powders.With increased exposure time,and thereby increased laser energy density,insoluble Ta particles were almost dissolved,and a Ti-50 wt％ Ta alloy was formed.Cellular and dendritic structures were formed due to constitutional undercooling,which was caused by the high cooling rate of LPBF process.Both retained β phases and α" phases were observed in the LPBFed Ti-50 wt％ Ta alloy.The α" phase was found at the boundary of the cellular structures,where the tantalum content was not high enough to suppress the bcc lattice transition completely but could suppress the β phase → α'phase transition.