Acta Metall Sin  1997, Vol. 33 Issue (9): 897-902    DOI:

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MICROSTRUCTURE EVOLUTION AND ACTIVIATION ENERGY IN SUPERPLASTICITY OF FeAl INTERMETALLIC ALLOYS

LI Dingqiang;LIN Dongliang;LIU Junliang;LIU Yi(The Public Laboratory of the State Education Commission for High Temperature Materials and High temperature Tests;Shanghai Jiaotong University; Shanghai 200030)

LI Dingqiang;LIN Dongliang;LIU Junliang;LIU Yi(The Public Laboratory of the State Education Commission for High Temperature Materials and High temperature Tests;Shanghai Jiaotong University; Shanghai 200030). MICROSTRUCTURE EVOLUTION AND ACTIVIATION ENERGY IN SUPERPLASTICITY OF FeAl INTERMETALLIC ALLOYS. Acta Metall Sin, 1997, 33(9): 897-902.

Abstract References Related Articles Recommended Metrics Download:  PDF(1865KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The microstructure evolution of large-grained FeAl intermetallic alloys during superplastic deformation has been investigated. The superplastic deformation exhibits characteristics of conventional grain-fining. During superplastic deformation, the shape of original grains changes significantly at first, then many subgrain boundaries form in the grains, and after that the misorientation of every two adjacent subgrains increases. In a whole,it results in the dramatical decrease of the grain size of FeAl alloys after the supefplastic deformation to fracture. The deformation activation energy was measured to be about 370,290 and 260 kJ. mo-1 for Fe-36.5Al, Fe-36.5Al-1Ti and Fe-36.5Al-2Ti alloys,respectively, which are much lower than the creep activation energy previously measured in FeAl alloys. Low deformation activation energy indicates that the superplastic deformation process may be controlled by subgrain boundary and grain boundary diffusion. Key words:  FeAl intermetallic alloy      superplasticity      microstructure      grain boundary      deformation activation energy      Received:  18 September 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I9/897 1Liu C T,Lee E H,McKamey C G.Son Metall Mater,1989;23:875 2Liu C T,McKamey C G,Lee E H.Scri Metall Mater 1990; 24: 385 3Li D Q.Shan A D,Liu Y,Lin D L Scri Metall Mater,1995;33:681 4郦定强,刘毅,单爱党,林栋梁.金属学报,1996;32:417 5Lin D L,Shan A D,Chen M W.Intermetallic, 1996; 4:489 6Lin D L,Shan A D,Chen M W.Acta Metall Sin(Engl Lett),1996;9:89 7刘震云,林栋梁,各月峰,单爱党,金属学报,1996;32:1139 8谷月峰,林栋梁,单爱党,刘毅,叶伟金属学报, 1996; 32:1135 9Liu Y,Li D Q、Lin D L.Scri Mater,1996;34:1105 10刘毅,郦定强,林栋梁金属学报,1996;32:225 11Whittenberger J D Mater Sci Eng,1986;77:103 12黄孝瑛透射电子显微学上海:上海科技出版社,1987: 246 13Whittenberger J D.Mater Sci Eng,1983:57:77T [1] ZHANG Leilei, CHEN Jingyang, TANG Xin, XIAO Chengbo, ZHANG Mingjun, YANG Qing. 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