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时效前处理对新型Al-Cu-Li-X合金力学性能和显微组织的影响
发布人：上海艾荔艾金属材料有限公司www.shailiai.com
更新时间：2015-12-31
研究时效前固溶处理、预变形等对一种新型超高强Al-Cu-Li-X合金板材力学性能和显微组织的影响。
时效前处理对新型Al-Cu-Li-X合金力学性能和显微组织的影响Effect of heat treatment before aging on tensile properties and microstructures of new Al-Cu-Li-X alloy
研究时效前固溶处理、预变形等对一种新型超高强Al-Cu-Li-X合金板材力学性能和显微组织的影响。结果表明：500~540 ℃固溶40 min时，随固溶温度的提高，合金的时效强度呈现先升高后持平的趋势，且在520 ℃时强度略有下降；510 ℃固溶20~180 min时，随固溶时间延长，合金的时效强度则呈现先升高后降低的趋势；(510 ℃, 40 min)固溶处理后的合金具有最高的时效强度。不同固溶处理合金的强度变化主要受固溶阶段第二相粒子的回溶程度、再结晶晶粒形态及长大趋势和过烧的共同影响。合金强化相为大量T1相(Al2CuLi)、部分θ′相(Al2Cu)和少量S′相(Al2CuMg)，预变形可促进T1相细小弥散析出，但抑制θ′相及S′相的析出。预变形量小于6%的预变形可有效提高合金的时效强度，但当预变形量大于6%之后，合金强度的增量逐渐减少。
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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