EFFECT OF ROLLING PROCESS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 7050 ALUMINUM ALLOY

Acta Metall Sin

2008, Vol. 44

Issue (1): 49-54 DOI:

Research Articles

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EFFECT OF ROLLING PROCESS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 7050 ALUMINUM ALLOY

中国科学院金属研究所

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. EFFECT OF ROLLING PROCESS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF 7050 ALUMINUM ALLOY. Acta Metall Sin, 2008, 44(1): 49-54 .

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Abstract The effect of rolling reduction and temperature on the microstructure and mechanical properties of 7050 aluminum alloy was investigated. For the sample with a rolling deformation of 30%, most of dendritic structure remained. When the rolling reduction increased to 70%, the cast structure disappeared with the microstructure being characterized by the subgrains and recrystallized grains. Some coarse phases were identified to be Al7Cu2Fe and Al2CuMg by DSC and EDS. The Al7Cu2Fe with a cluster distribution did not dissolve into the matrix, whereas the globular shape of the Al2CuMg phase suggested partial dissolution during the heat treatment. The fraction of the recrystallized grains in the samples rolled under a reduction of 70 and 90% was 1.25 and 12.4％, respectively. The sample rolled under a rolling reduction of 70% exhibited the highest strength and hardness. The sample rolled at 300oC had a lot of recrystallized grains. At 430oC, improved material flow and the occurrence of dynamic recovery reduced stored deformation energy, thereby decreasing the amount of recrystallized grains. In this case, the sample exhibited the highest strength and hardness.

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Received: 14 June 2007

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