Study on Grain Refinement of 7050 Aluminum Alloy at Different Cooling Rates
The refining mechanism of 7050 alloy was studied at different cooling rates by using V-shaped molds,optical microscopes,scanning electron microscopes,and other methods.The results indicated that as the cooling rate increased from 1.8 ℃/s to 54.3 ℃/s,the grain size of 7050 aluminum alloy decreased from 75.5 μm to 45.6 μm.As the cooling rate increased,the average size of T phases(AlZnMgCu)and S phases(Al2CuMg)in the second phase gardually decreased,the distribution was finer and more dispersed,and these two phases could serve as nucleation points for aluminum grains and promote grain refinement of 7050 alloy.
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