EFFECT OF HYDROGEN CONTENT ON STRUCTURE AND PROPERTIES IN 2091-T6 Al-Li ALLOY SHEET

Acta Metall Sin

1997, Vol. 33

Issue (10): 1047-1052 DOI:

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EFFECT OF HYDROGEN CONTENT ON STRUCTURE AND PROPERTIES IN 2091-T6 Al-Li ALLOY SHEET

LIN Zhaoqi;ZHAO Gang; LI Hongxiao; RU Hongqiang; LIU Chunming (Northeastern University; Shenyang 110006)

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LIN Zhaoqi;ZHAO Gang; LI Hongxiao; RU Hongqiang; LIU Chunming (Northeastern University; Shenyang 110006). EFFECT OF HYDROGEN CONTENT ON STRUCTURE AND PROPERTIES IN 2091-T6 Al-Li ALLOY SHEET. Acta Metall Sin, 1997, 33(10): 1047-1052.

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Abstract Effect of hydrogen content on the mechanical properties, stress-corrosion cracking life (SCCL), deformation mechanism and fracture mode in the 2091-T6 al-Li alloy sheet has been studied systematically. The experimental results show that as the H content in the alloy is lowered from 0.92μg / g to 0.08μg / g, the mechanical properties of σb,σ0.2 and δ,and SCCL are increased significantly. The deformation mechanism is also changed from the mode of dislocation shearing δ' phase to the Orowan looping mode, and the fracture appearance of tensile and stress-corrosion specimens is changed from typical intergranular brittle fracture to transgranular ductile fracture, the characteristic of low toughness fracture induced by hydrogen embrittlement disappeared completely The mechanism of the effect of dehydrogenation on the deformation and fracture mode in al-Li alloy is also discussed, and the concept of "Extra Low Hydrogen al-Li alloy" is proDosed in the present paper.

Key words: 2091-T6 Al-Li alloy hydrogen embrittlement mechanical property stress-corrosion cracking life deformation mechanism

Received: 18 October 1997

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