EFFECT OF FRICTION STIR PROCESSING ON THE MICROSTRUCTURE OF CAST 7075 ALUMINUM ALLOY

Acta Metall Sin

2008, Vol. 44

Issue (3): 319-324 DOI:

Research Articles

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EFFECT OF FRICTION STIR PROCESSING ON THE MICROSTRUCTURE OF CAST 7075 ALUMINUM ALLOY

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. EFFECT OF FRICTION STIR PROCESSING ON THE MICROSTRUCTURE OF CAST 7075 ALUMINUM ALLOY. Acta Metall Sin, 2008, 44(3): 319-324 .

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Abstract A new processing technique - friction stir processing (FSP) - was applied to process cast 7075 aluminum alloy. The effect of processing parameters on the microstructure of the stir zone was investigated. Because the coarse grains and coarse second-phase particles at grain boundaries in cast 7075Al reduced its plastic deformation ability substantially, it was difficult to obtain a uniform microstructure by usual tool designs and processing parameters. By overlapping the FSP passes, the homogeneous and fine equiaxed grains were produced in the stir zone. Furthermore, reducing the tool size and increasing the rotation rate resulted in a significant improvement in the microstructural homogeneity of the stir zone.

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Received: 13 September 2007

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