快速连续加热过程中剧烈冷变形亚稳β钛合金显微组织、相组成和拉伸性能的演变(英文)

Evolution of microstructure, phase composition, and tensile properties of severely cold deformed titanium metastable β alloy in rapid continuous heating

研究连续快速加热条件下亚稳βTi-1.5%Al-6.8%Mo-4.5%Fe钛合金剧烈冷变形对其显微组织、相组成和拉伸性能演变的影响。轧制态合金具有准非晶单相β结构,其电阻率与温度的关系呈现异常;将轧制态合金在室温下冷却暴露48 h,由于等温ω相的析出,电阻率与温度的关系恢复正常。随后,将合金以加热速率为5°C/s进行快速热处理,导致回复和再结晶发生。测定和讨论了不同处理后合金的拉伸性能。

Influence of severe cold deformation of titanium alloy Ti-1.5%A1-6.8%Mo-4.5%Fe in metastable β condition on the evolution of phase composition, microstructure, and tensile properties during continuous rapid heating was studied. As-deformed alloy was characterized by quasi-amorphous single-phase β condition with an abnormal temperature dependence of electric resistance that was normalized after 48 h exposure at room temperature as a result of isothermal ω phase precipitation. Subsequent rapid heating with a rate of 5 ℃/s caused recovery and recrystallization. Tensile properties of the alloy after different treatments were determined and discussed.