EFFFECT OF CURRENT PULSE ON SUPERPLASTICITY AND FRACTURE BEHAVIOUR OF 2091 Al-Li ALLOY

Acta Metall Sin

1993, Vol. 29

Issue (2): 41-44 DOI:

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EFFFECT OF CURRENT PULSE ON SUPERPLASTICITY AND FRACTURE BEHAVIOUR OF 2091 Al-Li ALLOY

LIU Zhiyi;CUI Jianzhong;BAI Guangrun Northeast University of Technology; Shenyang

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LIU Zhiyi;CUI Jianzhong;BAI Guangrun Northeast University of Technology; Shenyang. EFFFECT OF CURRENT PULSE ON SUPERPLASTICITY AND FRACTURE BEHAVIOUR OF 2091 Al-Li ALLOY. Acta Metall Sin, 1993, 29(2): 41-44.

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Abstract Effects of current pulse on mechanical behaviors and fracture mechanism of2091 Al-Li superplastically deformed at high strain rate have been investigated. Applying adirect current pulse makes the 2091 Al-Li alloy still with high stress-strain rate sensiitivityexponent and superplastic properties under superplastically deformed at high strain rate of10~(-2)s~(-1). SEM observation showed that the fracture for 2091 Al-Li alloy, superplastically de-formed at high strain rate by applying current pulse, transforms from intergranular tear totypical superplastic failure, i. e., fracture by formation and coalescene of cavities at particlesand boundaries.

Key words: current pulse superplasticity fracture Al-Li alloy

Received: 18 February 1993

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1993/V29/I2/41

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