Microstructure of a Ti–50wt% Ta alloy produced via laser powder bed fusion
来源期刊：Acta Metallurgica Sinica2020年第7期
论文作者：Lei-Lei Xing Hao Chen Zhi-Jian Shen Wei Liu
文章页码：981 - 990
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 βphases 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.
Lei-Lei Xing1，Hao Chen1，Zhi-Jian Shen1,3，Wei Liu1
1. School of Materials Science and Engineering,Tsinghua University3. Arrhenius Laboratory, Department of Materials and Environmental Chemistry,Stockholm University
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 βphases 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.
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