| Microstructure evolution in a large—grained TiAl alloy |
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| 引用本文： | 孙锋,林栋樑. Microstructure evolution in a large—grained TiAl alloy[J]. 中国有色金属学会会刊, 2002, 12(4): 615-620 |
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| 作者姓名： | 孙锋 林栋樑 |
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| 作者单位： | School of Materials Science and Engineering，Key Laboratory of Ministry of Education for High Temperature Materials and Tests，Shanghai Jiaotong University，Shanghai 200030，China |
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| 摘 要： | 1 ＩＮＴＲＯＤＵＣＴＩＯＮＡｃｏｎｔｉｎｕｏｕｓｒｅｃｏｖｅｒｙａｎｄｒｅｃｒｙｓｔａｌｌｉｚａｔｉｏｎｍｅｃｈａｎｉｓｍ[1,2 ] ｗａｓｐｒｏｐｏｓｅｄｂｙＬｉｎａｎｄｃｏｗｏｒｋｅｒｓｆｏｒｔｈｅｓｕｐｅｒｐｌａｓｔｉｃｉｔｙｉｎｌａｒｇｅ ｇｒａｉｎｅ
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| 关 键 词： | TiAl合金 显微组织 大颗粒 超塑性 |
Microstructure evolution in a large-grained TiAl alloy |
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| SUN Feng,LIN Dong liang. Microstructure evolution in a large-grained TiAl alloy[J]. Transactions of Nonferrous Metals Society of China, 2002, 12(4): 615-620 |
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| Authors: | SUN Feng LIN Dong liang |
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| Abstract: | Microstructure evolution during superplastic deformation of a large-grained TiA l alloys with near-γ microstructure was characterized by orientation imaging microscopy (OIM) and transmission electron microscopy (TEM). In OIM, significant grain refinement is observed at different strain levels with an increase in the density of low angle grain boundaries and high angle grain boundaries. A direct evidence of dynamic formation of grain boundaries with misorientation of 15 °～30° during deformation is found, which is a result of subboundary evolutio n. The formation of subboundaries by intersecting dislocations, and the evidence of dislocation glide in the interior of grains are revealed by TEM observations. A continuous recovery and recrystallization process similar to that in FeAl and Fe3Al is proposed as superplastic deformation mechanism in the large-grained TiAl alloy. |
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| Keywords: | TiAl alloy superplasticity microstructure evolution large grained EBSP |
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