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預(yù)時(shí)效工藝對(duì)7020鋁合金顯微組織和應(yīng)力腐蝕性能的影響

發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn 更新時(shí)間：2016-06-03

預(yù)時(shí)效工藝對(duì)7020鋁合金顯微組織和應(yīng)力腐蝕性能的影響Effect of pre-aging on microstructure and stress corrosion resistance of 7020 aluminum alloy

7020鋁合金經(jīng)470 ℃固溶1 h后分別進(jìn)行自然時(shí)效0 h、168 h以及65 ℃預(yù)時(shí)效72 h、168 h，再進(jìn)行(90 ℃，8 h)+(160 ℃，14 h)雙級(jí)時(shí)效。采用室溫拉伸、慢應(yīng)變速率拉伸(SSRT)、掃描電鏡(SEM)、透射電鏡(TEM)研究預(yù)時(shí)效工藝對(duì)7020鋁合金的常溫拉伸性能、抗應(yīng)力腐蝕性能與顯微組織的影響。結(jié)果表明:經(jīng)65 ℃、168 h預(yù)時(shí)效處理后，合金具有最高的抗拉強(qiáng)度R_m=397.4 MPa和最好的抗應(yīng)力腐蝕性能I_SSRT=-0.003; 65 ℃、72 h預(yù)時(shí)處理效和自然時(shí)效168 h后合金的抗拉強(qiáng)度和抗應(yīng)力腐蝕性能相當(dāng)，R_m、I_SSRT分別為387.6 MPa、0.034和392.0 MPa、0.036;而直接雙級(jí)時(shí)效合金的抗拉強(qiáng)度和抗應(yīng)力腐蝕性能最差，R_m、I_SSRT為368.9 MPa、0.038。晶內(nèi)析出相η′(MgZn₂)的尺寸隨預(yù)時(shí)效時(shí)間的延長(zhǎng)而減小，晶界析出相η(MgZn₂)的斷續(xù)分布程度隨預(yù)時(shí)效時(shí)間延長(zhǎng)而增大。

After solution heat treatment at 470℃ for 1h, the alloys were natural aged for 0 h or 168 h and pre-aged at 65 ℃ for 72 h or 168 h, respectively. And then, the two-step aging ((90 ℃, 8 h)+(160 ℃, 14 h)) was conducted on these alloys. The effect of pre-ageing treatment on the tensile properties, resistances to stress corrosion and microstructures of 7020 aluminum alloy was investigated by tensile test, slow strain rate tensile (SSRT) test, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). 7020 aluminum alloy aged at 65 ℃ for 168 h pre-ageing treatment has the highest tensile property R_m?of 397.4 MPa as well as the best stress corrosion resistance I_SSRT?of -0.003. The tensile property and stress corrosion resistance of alloy pre-ageing treatment at 65 ℃ for 72 h are 387.6 MPa and 0.034. And it is comparable of that of natural aging 168h, with R_m?of 392.0 MPa and I_SSRT?of 0.036. While the tensile property and stress corrosion resistance of alloy by direct two-step aging are the worst, with R_m?of 368.9 MPa and I_SSRT?of 0.038. With the increase of the pre-aging time, the size of intragranular precipitates η′(MgZn₂) inside grains decreases, the intermittent distribution degree of precipitates intragranular precipitates η′(MgZn₂) inside grains decreases and the intermittent distribution degree of precipitates η(MgZn₂) at the grain boundaries increases.

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