片层取向对Ti—49at%AlPST晶体断裂机制的影响

Effect of Loading Direaction on the Fracture Mechanism of PST Crystals of Ti-49at% Al Alloys

摘要:

用ＳＥＭ原位拉伸技术研究了Ｔｉ－４９ａｔ％ＡｌＰＳＴ晶体的断裂过程，研究表明：裂纹萌发和扩展路径强烈依赖于ＰＳＴ晶体的片层取向；不同取向ＰＳＴ晶体具有不同的断裂机制及断口形貌。

Abstract:

The fracture mechanisms of various lamellar oriented polysynthetically twinned (PST) crystals of Ti 49 at%Al based alloy have been studied using in situ SEM technique. The results indicate that the crack nucleation and propagation strongly depend on the lamellar orientations of PST crystals. The oriented PST crystals possess different fracture mechanisms and morphologies, depending on the lamellar orientation