【摘要】 通过力学性能测试、金相显微镜、扫描电镜及透射电镜观察,研究微量Ag对Al-5.3Cu-0.8Mg-0.3Mn-0.15Zr合金薄板力学性能和显微组织的影响。结果表明,加入微量Ag后,提高合金的时效硬化能力,缩短峰时效时间。合金的室温抗拉强度和高温耐热性能得到提高,合金力学性能提高的原因在于析出一种更细小弥散的片状Ω相。未添加Ag的合金析出强化相为θ′相和少量S′相;添加Ag后,主要强化相为Ω相和少量θ′相。经固溶时效处理后,两种合金均发生完全再结晶。更多还原

【Abstract】 The effects of trace element Ag on the microstructure and mechanical properties of an Al-5.3Cu-0.8Mg-0.3Mn-0.15Zr thin plate alloy were investigated by means of tensile testing,optical microscopy(O.M.),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The results show that the trace Ag addition can accelerate the hardening effect of the aged alloy and reduce the time to peak-aged.The mechanical properties can be improved at room and elevated temperatures,which is attributed to a much smaller dispersive Ω precipitation of thin plate shape.Meanwhile the ductility of the studied alloys remains at a higher level.The major strengthening phases of the alloy without Ag are θ′ precipitation and less S′ precipitation,while the strengthening phases of the alloy with Ag are Ω precipitation and less θ′ precipitation.After the solution and ageing treatment,the two alloys are both recrystallized totally.更多还原