根据近临界钼当量和多元强化原则设计了一种新型亚稳β钛合金(Ti-B20),以室温拉伸性能和显微组织为主要考察内容研究了固溶处理对这种新合金时效响应的影响.结果表明:在同样的时效条件下,该合金的抗拉伸强度随着固溶温度的升高而升高,而固溶后水淬比空冷能产生更高的硬化效应.分析结果揭示了该合金独特的时效响应来自于其亚稳β相较低的稳定性和过剩空位对析出的共同作用.
A new high strength metastable beta titanium alloy(Ti-B20) was designed according as the principle of ‘near critical molybdenum equivalent and multicomponent strengthening'. The effect of solution treatment on aging response of the new alloy including room temperature tensile properties and microstructures were investigated. It is found that the tensile strength increases with the increase of solution temperatures on the same aging conditions and water quenching from solution temperatures can produce higher age hardening effect compared with air cooling. The results reveal that the specific aging response of the new alloy is from the low stability of metastable beta phase together with the effect of excess vacancy on precipitation.
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