Lee Huey-Er, Wu Ju-Hui, Chao Chih-Yeh, Chang Yen-Hao, Du Je-Kang, Chen Ker-Kong, Chen Huey-Ming
Department of Dentistry, Yuan's General Hospital, Kaohsiung 80249, Taiwan.
Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan.
Materials (Basel). 2020 Dec 14;13(24):5694. doi: 10.3390/ma13245694.
The microstructural characteristics and Young's modulus of the as-cast Ti-15Ta-15Nb alloy are reported in this study. On the basis of the examined XRD and TEM results, the microstructure of the current alloy is essentially a mixture (α + β+ α' + α″ + ω + H) phase. The new H phase has not previously been identified as a known phase in the Ti-Ta-Nb alloy system. On the basis of examination of the Kikuchi maps, the new H phase belongs to a tetragonal structural class with lattice parameters of a = b = 0.328 nm and c = 0.343 nm, denoting an optimal presentation of the atomic arrangement. The relationships of orientation between these phases would be {0001}//{110}//{1¯21¯0}//{101¯} and (011¯0)//(11¯2)//(1¯010)//(121) Moreover, the Young's modulus of the as-cast Ti-15Ta-15Nb alloy is approximately E = 80.2 ± 10.66 GPa. It is implied that the Young's modulus can be decreased by the mixing of phases, especially with the presence of the H phase.
本研究报道了铸态Ti-15Ta-15Nb合金的微观结构特征和杨氏模量。基于XRD和TEM检测结果，当前合金的微观结构本质上是一种（α + β+ α' + α″ + ω + H）相的混合物。新的H相此前在Ti-Ta-Nb合金体系中未被鉴定为已知相。基于对菊池线图的检测，新的H相属于四方结构类，晶格参数为a = b = 0.328 nm，c = 0.343 nm，表示原子排列的最佳呈现。这些相之间的取向关系为{0001}//{110}//{1¯21¯0}//{101¯}和(011¯0)//(11¯2)//(1¯010)//(121)。此外，铸态Ti-15Ta-15Nb合金的杨氏模量约为E = 80.2 ± 10.66 GPa。这意味着相的混合，特别是H相的存在，可以降低杨氏模量。
