本文選題：Al-Mg-Si-Cu-Zn合金 + 熱加工�。� 參考：《金屬學(xué)報》2017年08期

【摘要】：通過OM、SEM、TEM觀察以及EBSD和力學(xué)性能測試等手段研究了不同熱加工工藝對Al-Mg-Si-Cu-Zn合金板材組織、織構(gòu)和成形性能,以及固溶淬火后等溫時效對其析出行為的影響規(guī)律。結(jié)果表明,2種熱加工工藝對T4P預(yù)時效態(tài)合金的強度和應(yīng)變硬化指數(shù)n基本無影響,但是對平均塑性應(yīng)變比rˉ、Δr以及不同方向延伸率影響顯著;不同熱加工過程對合金組織和織構(gòu)演化均有影響,成形性能較好的固溶淬火態(tài)合金板材平均晶粒尺寸略大且呈雙模型晶粒尺寸分布特征,其織構(gòu)組分較多,但是強度較低。對該淬火態(tài)合金進(jìn)行185℃人工時效20 min,其硬度即可升高65 HV,進(jìn)一步時效到5 h達(dá)到峰值硬度132 HV,對應(yīng)的拉伸性能可達(dá)Rp=318 MPa,Rm=364 MPa,A=13%,拉伸斷口為典型的塑性斷裂。該合金在185℃時效時仍以Mg-Si相析出為主,如b"、b'和Q'相等,峰時效后b"相主要沿b軸方向生長,最后轉(zhuǎn)化為b'和Q'相,合金表現(xiàn)出較好的時效穩(wěn)定性。
[Abstract]:The effects of different hot working processes on the microstructure, texture and formability of Al-Mg-Si-Cu-Zn alloy sheet were studied by means of TEM observation, EBSD and mechanical properties test, as well as the effect of isothermal aging after solution quenching on the precipitation behavior of Al-Mg-Si-Cu-Zn alloy sheet. The results show that the two hot working processes have no effect on the strength and strain hardening index (n) of T4P preaging alloy, but have significant effects on the average plastic strain ratio (r), 螖 r and elongation in different directions. The microstructure and texture evolution of the alloy were affected by different hot working processes. The average grain size of the solid solution quenched alloy sheet with better formability was slightly larger, and the grain size distribution was similar to that of the double model. The texture composition was more, but the strength was lower. After artificial aging at 185 鈩，

本文編號：1901389