梯度热处理快速优化Ti-6.8Mo-3.9Al-2.8Cr-2Nb-1.2V-1Zr-1Sn合金获得高强高韧性能的微观组织

1 Introduction

Metastable β titanium alloy has great potential application in aerospace and biomedical industries due to their high specific strength, good combination of strength and ductility [1-2]. The development of aerospace industry requires higher performance of titanium alloy, facilitating the design and development of new β-Ti alloys [3-6], Ti-6.8Mo-3.9Al-2.8Cr-2Nb-1.2V-1Zr-1Sn alloy is one of them. As a high strength metastable β-Ti alloy, the strength and ductility is very sensitive to microstructure mainly depending on solution and ageing treatment. It is a key way to tailoring mechanical properties through establishing the relationship between heat treatment and microstructures.