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雙級(jí)時(shí)效對(duì)7085鋁合金組織和性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.bt990.com.cn
更新時(shí)間：2015-10-31
采用硬度、電導(dǎo)率、力學(xué)拉伸、慢應(yīng)變速率拉伸試驗(yàn)及透射電鏡等測(cè)試分析方法，研究雙級(jí)時(shí)效對(duì)7085鋁合金組織和性能的影響。
雙級(jí)時(shí)效對(duì)7085鋁合金組織和性能的影響Effect of two-step aging on microstructure and properties of 7085 aluminum alloy
采用硬度、電導(dǎo)率、力學(xué)拉伸、慢應(yīng)變速率拉伸試驗(yàn)及透射電鏡等測(cè)試分析方法，研究雙級(jí)時(shí)效對(duì)7085鋁合金組織和性能的影響。結(jié)果表明：預(yù)時(shí)效熱處理主要析出相為GP 區(qū)和η′相，預(yù)時(shí)效時(shí)間對(duì)合金硬度和電導(dǎo)率的影響較小。隨著第二級(jí)時(shí)效時(shí)間的延長(zhǎng)，合金的抗拉強(qiáng)度和屈服強(qiáng)度先增大后減小，電導(dǎo)率和抗應(yīng)力腐蝕性能提高，晶界析出相由連續(xù)分布變?yōu)榉沁B續(xù)分布。第二級(jí)時(shí)效溫度越高，合金強(qiáng)度隨時(shí)效時(shí)間的延長(zhǎng)，降低得越顯著。采用(110℃, 6h)+(160℃, 12h)雙級(jí)時(shí)效熱處理，合金的抗拉強(qiáng)度、屈服強(qiáng)度、伸長(zhǎng)率及電導(dǎo)率分別為515MPa、487MPa、11.7%、38%(IACS)。
The effect of two-step aging treatment on microstructure and properties of 7085 aluminum alloy was investigated by hardness,conductivity, mechanical testing, slow strain rate testing and transmission electron microscopy. The results show that the GP zones andη′phase are the mainly precipitation phases of pre-aging, and the pre-aging time is less impact on the hardness and electrical conductivity. The strength after two-step aging process first increases, and then decreases, while the ability of stress corrosion resistance increases with the extension of the second step of aging time. With the size of grain boundary precipitates coarsening, and the distribution of grain boundary precipitates from continuous to non-continuous. The strength of the alloy significantly decreases with the increases of the second step aging temperature. The optimal of the two-step aging process is (110 ℃, 6 h)+(160 ℃, 12 h), the tensile strength, yield strength, elongation and conductivity of alloy are 515MPa, 487MPa, 11.7%, 38%(IACS), respectively.
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