DIFFUSION BONDING OF SUPERPLASTIC AI ALLOY LC4

Abstract

Abstract: Diffusion bonding of supcrplastic Al alloy LC4,with prior surface treatment of organic solution protecting coating after electroplishing and stainless steel wool brushing,was performed by Gleeble test machine under conditions ranged 490—530 ℃,1.0—3.0 MPa. 30—180 min and vacuum of 1.0×10~(-3) Pa.The joints were examined to have similar strength and microstructure to the base metal Discussion was made on the effect of superplastic treatment on bonding.The micromechanism for diffusion bonding of super- plastic metal was suggested as the migration of original bond interfaces caused by atomic diffusion and grain growth. Experimental results for the alloy as quench-aged state were presented to compare with the superplastic one.

Key words: superplasticity, Al alloy, diffusion bonding, alloy LC4

HUANG Yan;MA Longxiang Northeast Universtity of Technology,Shenyang,China lecturer,Department of Metalforming,Northeast University of Technology,Shenyang 110006,China. DIFFUSION BONDING OF SUPERPLASTIC AI ALLOY LC4[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(8): 116-121.

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DIFFUSION BONDING OF SUPERPLASTIC AI ALLOY LC4

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