Formation of hybrid structure and enhancement of ductility in beta titanium alloys using elemental segregation

本研究旨在利用Mo的旋转偏析（VGS结构）改善β型Ti-Mo合金的力学性能，并探讨其性能改善机理。通过适当的热处理，施加与VGS组织相对应的局部硬度分布，限制了室温拉伸试验中的局部变形（颈缩），并提高了总延伸率值。VGS组织的加入也提高了Ti-10 Mo-Fe合金的室温延伸率。在锻造和轧制前改变铸锭的初始尺寸会影响VGS组织的形貌和室温拉伸性能。

This study aimed at improving the mechanical properties of beta type Ti-Mo alloys using swirly segregation of Mo (VGS structure) and investing the property improvement mechanism. Applying local hardness distribution corresponding to the VGS structure through appropriate heat treatment restricted the local deformation (necking) during room temperature tensile testing and enhanced the total elongation values. Giving the VGS structure also improved the room temperature total elongation values in Fe added Ti-10Mo-Fe alloys. Changing the initial ingot size before forging and rolling affected the morphology of VGS structure and room temperature tensile properties.