研究了热处理对7A04铝合金力学性能的影响.结果表明,直径60mm的7A04铝合金棒材在200℃电流直接加热回归后再时效,从心部到表层的拉伸强度为620-640 MPa,延伸率均匀一致;在3%NaCl+0.5%H2O2水溶液介质中和375 MPa应力下的应力腐蚀断裂时间大于30 d,而辐射式加热回归的为575 MPa,延伸率从心部至表层表现极不均匀,应力腐蚀断裂时间只有19 d.电流直接加热实现了直径60 mm 7A04铝合金大截面棒材的快速均匀回归,再时效获得了最弥散的晶内析出粒子和尺寸及间距较大的晶界析出相,使合金在保持T6状态拉伸强度的同时,具有优良的抗应力腐蚀性能.
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