Effect of aging treatments on microstructure and properties of cast-rolled 7050 aluminum alloy
Microstructure and properties of cast-rolled 7050 aluminum alloy by different aging treatments were analyzed by means of transmission electron microscopy（TEM）,X-ray diffraction（XRD）,Vickers hardness test.Results show that for single aging treatment,when aging temperature increases,the time reaching to peak hardness decreases and the lower peak hardness is obtained,and the precipitates in grains and at grain boundary also grows up with increase of the temperature.For double aging treatment,many coarser precipitates in grains are observed and the precipitates are discontinously distributed at grain boundary,moreover,the precipitation free zones（PFZ）at grain boundary is more obvious.After retrogression and reaging（RRA）treatment,the precipitates in grains are coarser compared to those of single aging treatment,the discontinous strip precipitates from at grain boundary and PFZ becomes wider.
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万方数据
维普
