【摘要】：設(shè)計(jì)了針對(duì)7075鋁合金攪拌摩擦焊接頭的焊后雙溫固溶處理/時(shí)效的熱處理制度,并采用掃描電鏡,透射電鏡,顯微硬度和拉伸試驗(yàn)研究了雙溫固溶處理對(duì)攪拌摩擦焊7075鋁合金接頭組織及性能的影響。結(jié)果表明,雙溫固溶處理可以實(shí)現(xiàn)接頭組織的充分均勻化,同時(shí)導(dǎo)致粗大MgZn_2析出相的部分溶解和細(xì)小的MgAlCu相析出。經(jīng)雙溫固溶處理和130℃時(shí)效處理24 h后,接頭力學(xué)性能明顯恢復(fù),焊接區(qū)硬度高于母材,接頭強(qiáng)度和塑性與母材相當(dāng)。
[Abstract]:The heat treatment system of 7075 aluminum alloy friction stir welding joint after double temperature solid solution treatment / aging was designed, and the scanning electron microscope and transmission electron microscope were used. The effect of double temperature solid solution treatment on the microstructure and properties of friction stir welding (FSW) 7075 aluminum alloy joint was studied by microhardness and tensile test. The results show that the microstructure of the joints can be fully homogenized by double temperature solution treatment, which leads to the partial dissolution of coarse MgZn_2 precipitates and the precipitation of fine MgAlCu phases. The mechanical properties of the joints were obviously recovered after the treatment of double temperature solid solution and aging at 130 鈩，

本文編號(hào)：2279406