時效前處理對新型Al-Cu-Li-X合金力學性能和顯微組織的影響
發(fā)布人：上海艾荔艾金屬材料有限公司www.bt990.com.cn
更新時間：2015-12-31
研究時效前固溶處理、預變形等對一種新型超高強Al-Cu-Li-X合金板材力學性能和顯微組織的影響。
時效前處理對新型Al-Cu-Li-X合金力學性能和顯微組織的影響Effect of heat treatment before aging on tensile properties and microstructures of new Al-Cu-Li-X alloy研究時效前固溶處理、預變形等對一種新型超高強Al-Cu-Li-X合金板材力學性能和顯微組織的影響。結果表明：500~540 ℃固溶40 min時，隨固溶溫度的提高，合金的時效強度呈現(xiàn)先升高后持平的趨勢，且在520 ℃時強度略有下降；510 ℃固溶20~180 min時，隨固溶時間延長，合金的時效強度則呈現(xiàn)先升高后降低的趨勢；(510 ℃, 40 min)固溶處理后的合金具有最高的時效強度。不同固溶處理合金的強度變化主要受固溶階段第二相粒子的回溶程度、再結晶晶粒形態(tài)及長大趨勢和過燒的共同影響。合金強化相為大量T1相(Al2CuLi)、部分θ′相(Al2Cu)和少量S′相(Al2CuMg)，預變形可促進T1相細小彌散析出，但抑制θ′相及S′相的析出。預變形量小于6%的預變形可有效提高合金的時效強度，但當預變形量大于6%之后，合金強度的增量逐漸減少。
Effect of solution treatment and pre-deformation before aging on tensile properties and microstructures of a new ultra-high strength Al-Cu-Li-X alloy were investigated. The result shows that, as solution-treated for 40 min at 500-540 ℃, the strength of the aged alloy increases firstly then keeps a relatively same strength with increasing the solution temperature except at 520 ℃. As solution-treated at 510 ℃for 20-180 min, the strength of the aged alloy increases firstly then decreases. The aged alloy with solution treatment of (510 ℃, 40 min) possesses the highest strength. The strength variation corresponding to various solution treatment is comprehensively affected by the secondary particle dissolution, grain structure, grain growth and overburning. The strengthening precipitates of the aged alloy consist of a large number of T1?phase (Al2CuLi), some θ′ phase (Al2Cu) and a small amount of S′ phase (Al2CuMg). Pre-deformation can promote the precipitation of T1?phase, but restrain the precipitation of θ′ and S′ phases. When the pre-deformation is lower than 6%, the strength increases substantially with increasing pre-deformation. But when the pre-deformation is larger than 6%, the strength increment caused by pre-deformation is reduced.
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