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.

中文翻译：

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通过激光粉末床熔化生产的Ti–50 wt％Ta合金的微观结构

Ti-Ta合金具有高生物相容性和耐腐蚀性，因此已在生物医学应用方面进行了广泛的研究。在这项工作中，通过机械混合粉末的激光粉末床熔合（LPBF），制备了几乎完全致密且原位合金化的Ti–50 wt％Ta样品。随着曝光时间的增加，从而增加了激光能量密度，不溶性Ta颗粒几乎被溶解，形成了Ti–50 wt％的Ta合金。LPBF工艺的高冷却速率是由于结构过冷而形成的细胞和树突状结构。在LPBFed Ti–50 wt％Ta合金中观察到保留的β相和α ”相。该α在细胞结构的边界处发现了“”相，那里的钽含量不足以完全抑制bcc晶格转变，但可以抑制β相→  α ′相转变。