Process design for producing biomedical β-type titanium alloys with high biocompatibility

在生物医用β类型钛合金Ti-29Nb-13Ta-4.6Zr中，由于对腐蚀液的较高耐腐蚀性，在腐蚀过程中形成了特定的相，该相在高压扭转下被形成。研究表明，特定相的耐腐蚀性高于母材。结果表明，合金元素在特定相中的分布与在基体中的分布不同，合金元素在特定相中的分布比在基体中的分布更均匀。这种均匀的元素分布被认为是通过高压扭转的强烈机械搅拌而获得的，并导致特定相的耐蚀性高于基体。

A specific phase that is not etched during etching because of higher corrosion resistance to an etching solution is formed in a biomedical β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr, subjected to high pressure torsion. Higher corrosion resistance of the specific phase than that of matrix was elucidated in this study. It is found that the alloying element distribution in the specific phase is different from that in the matrix; the alloying element is distributed more homogeneously in the specific phase than the matrix. This homogeneous element distribution is considered to be obtained by strong mechanical stir of high pressure torsion, and to cause higher corrosion resistance of the specific phase than that of the matrix.