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Improvement on mechanical properties and corrosion resistance of titanium-tantalum alloys in-situ fabricated via selective laser melting
Journal of Alloys and Compounds ( IF 4.650 ) Pub Date : 2019-06-26 , DOI: 10.1016/j.jallcom.2019.06.307
Danlei Zhao,Changjun Han,Yan Li,Jingjing Li,Kun Zhou,Qingsong Wei,Jie Liu,Yusheng Shi

In this study, the role of tantalum (Ta) on the phase transformation, microstructure evolution, mechanical properties and corrosion resistance of titanium-tantalum (Ti–Ta) alloys in-situ fabricated via selective laser melting (SLM) was investigated. Ti–Ta mixed powders with different Ta ratios ranging from 0 to 25 wt % were prepared by ball milling for the SLM process. With the increase of Ta content, the SLM-processed Ti–Ta alloys exhibits the microstructure evolution from the lath α grain to acicular α' + primary cellular β grains, accompanying with the gradual suppression of martensite transformation. The β-stabilized effect of Ta promotes the formation of β (Ti, Ta) solid solution phase in the alloys. The rise of Ta addition in SLM-processed Ti–Ta alloys contributes to the improvement on the tensile strength from 641 to 1186 MPa and the microhardness from 257 to 353 HV, which results from a combined effect of grain refinement strengthening and the solid solution strengthening. The Young's modulus decreases from 115 to 89 GPa due to the increasing amount of β phase. Additionally, the corrosion resistance of the Ti–Ta alloys is enhanced with few pits on the surfaces due to the increasing amount of Ta2O5 identified through X-ray photoelectron spectroscopy. These findings provide the knowledge and boost the further understanding on the SLM-processed Ti–Ta alloys as promising candidates for biomedical application.



中文翻译:

通过选择性激光熔化原位制备的钛-钽合金的机械性能和耐蚀性得到改善

在这项研究中,钽(Ta)在原位钛钛(Ti–Ta)合金的相变,组织演变,力学性能和耐蚀性中的作用研究了通过选择性激光熔化(SLM)制造的材料。通过球磨法为SLM工艺制备了不同Ta比值范围为0至25 wt%的Ti-Ta混合粉末。随着Ta含量的增加,经SLM处理的Ti-Ta合金表现出从板条α晶粒到针状α'+初生蜂窝状β晶粒的微观组织演变,并逐渐抑制了马氏体转变。Ta的β稳定作用促进了合金中β(Ti,Ta)固溶相的形成。SLM处理的Ti-Ta合金中Ta添加量的增加有助于将抗拉强度从641提高到1186 MPa,并将显微硬度从257提高到353 HV,这是由于晶粒细化强化和固溶强化的共同作用所致。年轻人' 由于β相的增加,模量从115 GPa降低到89 GPa。此外,由于增加了Ta的量,Ti-Ta合金的耐蚀性得到了增强,表面上几乎没有凹坑通过X射线光电子能谱鉴定2 O 5。这些发现提供了知识,并促进了对SLM处理的Ti-Ta合金作为有前途的生物医学应用候选者的了解。

更新日期:2019-06-26
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