摘要
The high temperature(HT)thermal stability and mechanical properties of Al-5%Cu(AC)and Al-5%Cu-0.2%Mn-0.2 Zr%(ACMZ)alloys from 573 to 673 K were systematically studied.The results displayed that micro-alloying additions of Zr and Mn elements have presented a significant role in stabilizing the main strengthening metastableθ′precipitates at a temperature as high as 573 K.Simultaneously,the HT tensile test demonstrated that ACMZ alloy retained their strength of(88.6±8.8)MPa,which was much higher than that of AC alloy((32.5±0.8)MPa)after the thermal exposure at 573 K for 200 h.Finally,the underlying mechanisms of strength and ductility enhancement mechanism of the ACMZ alloy at HT were discussed in detail.
系统研究Al-5%Cu(AC)和Al-5%Cu-0.2%Mn-0.2Zr%(ACMZ)合金在温度为573~673K的高温热稳定性和力学性能。结果表明,微合金化添加Zr和Mn元素对573 K主要强化相θ′相的稳定起到至关重要的作用。同时,高温拉伸结果表明,573 K热暴露200 h后,ACMZ合金强度为(88.6±8.8)MPa,远高于相同状态下AC合金的强度((32.5±0.8)MPa)。最后,讨论高温状态下ACMZ合金的强度和塑性强化机制。
基金
financial supports from the National Natural Science Foundation of China(No.52071207)
the China Postdoctoral Science Foundation(Nos.2019TQ0193,2019M661497)
the National Key Research and Development Program of China(No.2018YFB1106302)
Anhui Provincial Engineering Research Center of Aluminum Matrix Composites,China(No.2017WAMC002)。
