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

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.

微量Ti·Gd对银的组织和再结晶特性的影响

采用硬度法、金相、Ｘ－ｒａｙ衍射、透射电镜和能谱分析等手段研究了Ａｇ－Ｔｉ（００５～０６１ｗｔ％Ｔｉ，下同）和Ａｇ－Ｔｉ－Ｇｄ（０５１～１３ｗｔ％Ｔｉ，００９～０４６ｗｔ％Ｇｄ，下同）合金的组织、再结晶特性和相结构。结果表明：微量Ｔｉ及Ｔｉ＋Ｇｄ加入Ａｇ中，有效细化晶粒，提高晶粒组织稳定性，再结晶温度相应提高１００～１５０℃和２５０℃；作者还确认了某些二相合金和三相合金；最后探讨了微量元素的作用机理。