V、Mo对β-γ TiAl合金α、β两相相变的影响

The effects of V、Mo on the transformations of α phase and β phase based on β/γ TiAl

摘要:

以Ti-Al-M三元合金(M为V,Mo强β相稳定元素)为对象,研究了合金元素V、Mo对铸态组织以及不同热处理条件下显微组织的影响。V、Mo元素可以改变传统TiAl合金的凝固路径,避开包晶反应,还能将β相保留至室温。在合金淬火组织中,增加V、Mo元素含量可以发生马氏体转变。在两步热处理过程中,增加Mo元素含量,合金更倾向于发生α→β＋γ及β→β＋γ相变。

Abstract:

Based on Ti-Al-M alloys , the effect of V、Mo elements on as-cast microstructure as well as the microstructure of different heat treatment processings is studied. V、Mo elements can change the solidification path of conventional γ- TiAl, avoid peritectic reaction, and preserve β phase to room temperature. The martensite mode will be observed in the microstructure subjected to water quenching condition, with increasing the content of V、Mo elements. During two-step heat treatment procedure, with Mo addition, alloys are prone to the transformation reaction of α→β＋γ as well as β→β＋γ.