Effect of 2–6 at.% Mo addition on microstructural evolution of Ti-44Al alloy
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第7期
论文作者：S.Z.Zhang Z.W.Song J.C.Han C.J.Zhang P.Lin D.D.Zhu F.T.Kong Y.Y.Chen
文章页码：1196 - 1204
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-44 A1 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 αphase, the angles between the lamellar orientation and the block β/β0 phase are roughly at 0°, 45° and90°. Comparing with heat treatment microstructure, the hot compression microstructure contains lessβ/β0 phase, however, the β/β0 phase containing 2 Mo alloy and 3 Mo alloy hot compressed at 1275 ℃ has the inverse tendency. In addition,（α2 +γ） colony is decomposed by the discontinuous transformation.
S.Z.Zhang1,2，Z.W.Song1,2，J.C.Han3，C.J.Zhang1,2，P.Lin1,2，D.D.Zhu4，F.T.Kong5，Y.Y.Chen5
1. School of Materials Science and Engineering, Taiyuan University of Technology2. Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology3. School of Mechanical Engineering, Taiyuan University of Technology4. School of Mechanical Engineering, Quzhou University5. State Key Laboratory for Advanced Welding and Jointing, Harbin Institute of Technology
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-44 A1 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 αphase, the angles between the lamellar orientation and the block β/β0 phase are roughly at 0°, 45° and90°. Comparing with heat treatment microstructure, the hot compression microstructure contains lessβ/β0 phase, however, the β/β0 phase containing 2 Mo alloy and 3 Mo alloy hot compressed at 1275 ℃ has the inverse tendency. In addition,（α2 +γ） colony is decomposed by the discontinuous transformation.
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