Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金挤压材的性能

发布时间：2019-06-06 17:54

【摘要】：研究了Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金挤压材在固溶-T652和预回复-固溶-T652时的组织和性能。结果表明:该合金在121℃×24h时效制度下,预回复退火处理可有效细化晶粒(从9.76μm减小到5.56μm),降低晶界平均角度(从23.59°降低至17.41°),显著提高低角度晶界百分比(从53%提高到67%),提高位错强化,并显著抑制再结晶的发生;与固溶-T652相比,预回复-固溶-T652工艺在不降低强度的情况下可提高其晶间和剥落腐蚀性能(最大晶间腐蚀深度从125.0μm减少到91.4μm,剥落腐蚀从EB级提高到EA级);在预回复-固溶-T652状态下合金的抗拉强度达到728MPa,预回复退火处理能提高合金的强度。位错强化和低角度晶界强化是合金的主要强化机制。
[Abstract]:The microstructure and properties of Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr aluminum alloy extruded materials under solid solution-T652 and pre-recovery-solid solution-T652 were studied. The results show that the grain size (from 9.76 渭 m to 5.56 渭 m) and the average grain boundary angle (from 23.59 掳to 17.41 掳) can be effectively refined by pre-recovery annealing at 121 鈩，

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