Effect of 2-6 at.％ Mo addition on microstructural evolution of Ti-44Al alloy

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（7）
• 页码范围: 1196-1204
• 页数: 9页
• 语种: 英文

摘要

In order to understand the effect of Mo alloying on the microstructural evolution of TiAl alloy,the as-cast microstructure,heat treated microstructure characteristic,and hot compression microstructure evolution of Ti-44Al alloy have been studied in this work.The as-cast microstructure morphology changes from (γ+α2) lamellar colony and β/β0 + γ mixture structure to β/β0 phase matrix widmannstatten structure,when Mo content increases from 2 at.％ to 6 at.％.Affected by the relationship between β phase and α phase,the angles between the lamellar orientation and the block β/β0 phase are roughly at 0°,45° and 90°.Comparing with heat treatment microstructure,the hot compression microstructure contains less β/β0 phase,however,theβ/β0 phase containing 2Mo alloy and 3Mo alloy hot compressed at 1275 ℃ has the inverse tendency.In addition,(α2 + γ) colony is decomposed by the discontinuous transformation.