MICROSCOPIC OBSERVATION OF SUPERPLASTIC DEFORMATION IN A Ti_3AI ALLOY

Acta Metall Sin

1994, Vol. 30

Issue (22): 465-470 DOI:

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MICROSCOPIC OBSERVATION OF SUPERPLASTIC DEFORMATION IN A Ti_3AI ALLOY

SUN Fusheng;MA Jimin;CAO Chunxiao(Institute of Aeronautical Materials; Beijing)

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SUN Fusheng;MA Jimin;CAO Chunxiao(Institute of Aeronautical Materials; Beijing). MICROSCOPIC OBSERVATION OF SUPERPLASTIC DEFORMATION IN A Ti_3AI ALLOY. Acta Metall Sin, 1994, 30(22): 465-470.

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Abstract Superior superplasticity up to 382 % is noticeable when alloy Ti-25AI-10Nb-3V-1 Mo(at.-%)is deformed at temperature 900-980℃ and a strain rate of 1×10~(-3) s~(-1). The superplastic model for grain boundary sliding combined with diffusion,dislocation slip, dislocation loop and stacking fault accommodation processes is recognized.Diffusion accommodation process is characteristic of helical dislocation and superjog climb by atomic diffusion mechanism. It is well established that type dislocation with dominate the dislocation accommodation process. The majority of dislocation loops are identified as shearing ones with,and a few of them are determined to be shearing plus diffusion dislocation loops with .

Key words: Ti_3AI alloy superplastic deformation microscopic observation

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1994/V30/I22/465

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