SUPERPLASTICITY OF Ti-24Al-14Nb-3V-0.5Mo ALLOY

Acta Metall Sin

1994, Vol. 30

Issue (19): 309-313 DOI:

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SUPERPLASTICITY OF Ti-24Al-14Nb-3V-0.5Mo ALLOY

WANG Bin;JIA Tiancong;WANG Yuequn;ZOU Dunxu;ZHONG Zengyong(Central Iron and Steel Research Institute; Ministry of Metallurgical industry; Beijing)BAI Bingzhe; YANG Luyi (Beijing Institute of Mechanical and Electrical Technology;Ministry of Mechanical and Electrical industry)

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Abstract Effect of temperature and strain rate on superplasticity of Ti-24Al-14Nb-3V-0.5Mo alloy has been studied. Under the optimal condition of 980℃ and 3.5 ×10~(-4)s~(-1), the maximum values of the strain rate sensitivity index, m, and tensile elongation are 0.69 and 818% respectively. A fine equiaxed α_2+β_0 duplex structure was observed in the superplastically deformed alloy. Together with the behaviour of alloy under isothermal tension test,it is believed that the alloy is of the fine-grained structural superplasticity. During superplastical deformation. no cavitation was found, but dynamic coarsening of the microstructure occurred .

Key words: Ti_3Al-Nb-V-Mo alloy superplasticity fine-grain structure

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1994/V30/I19/309

1DuttaA,BanerjeeD．ScrMetallMater,1990;24:13192YangHS,JinP,DalderE,MukherjeeAK．ScrMetallMater．1991;25:12233YangHS,JinP,MukherjeeAK．MaterTransJIM,1992;31:384JiaTiancong,WangBin,ZouDunxu,MaHuiping,ZhongZengyongMaterSciEng,1992;A152:3175WangBin,JiaTiancong,ZouDunxu,MaHuiping,ZhongZengyong．MaterSciEng,1992;A153:4226LeeD,BackofenWA．TransMetallSocAIME．1967;239:1034j

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