Dependence of mechanical properties on the microstructure characteristics of a near β titanium alloy Ti-7333

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 48-54
• 页数: 7页
• 语种: 英文

摘要

In this work,the microstructure and the corresponding tensile properties of the rolled Ti-7Mo-3Nb-3Cr-3Al (Ti-7333) alloy before and after the thermal treatments were investigated.The results show that a strong α-fiber texture is developed in the rolled Ti-7333 alloy.The deformed matrix and the texture significantly induce the variant selection of α phase.The high strength of the rolled Ti-7333 alloy is attributed to the <110> texture parallel to the tensile direction and the dispersed α phase within the matrix.After the solution treatment followed by the aging treatment,the texture decreases and the microstructure consists of the equiaxed β grains,the spheroidal αp phase and various needle-like α variants.Eventually,the alloy could achieve an optimal combination with the strength of about 1450 MPa,the ductility of about 10.5％ and a considerable shear strength of about 775 MPa.This balance can be ascribed to the performance of the spheroidal αp phase and various needle-like αs variants.The results indicate that the Ti-7333 alloy could be a promising candidate material for the high-strength fastener.