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Microstructural evolution and mechanical properties of as-cast and T6-treated AA2195 DC cast alloy

机译:铸造和经T6处理的AA2195直流铸造合金的组织演变和力学性能

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The use of direct chill (DC) cast ingot plates of AA2195 alloys has been recently extended for large mold applications in the plastics and automotive industries. The microstructural evolution of the as-cast AA2195 alloy was investigated using the Factsage thermodynamic software under both equilibrium and non-equilibrium conditions, and was compared with the results from differential scanning calorimetry (DSC) analysis and microstructural observations. The as-cast microstructure exhibited the presence of Al_2CuMg, Al_2Cu and Al_2CuLi intermetallic phases formed at the aluminum dendrite boundaries, which can be completely dissolved in the a-Al matrix during the solution treatment. A significant improvement in the mechanical properties of the AA2195 cast alloy after the T6 heat treatment is attributed to the formation of nano-scale θ' (Al_2Cu) and Tl (Al_2CuLi) precipitates. However, the non-uniform distribution of Tl precipitates together with the large size and low density indicate that the role of 9' precipitates in strengthening the AA2195 cast alloy is more dominant than that of the Tl precipitates, in contrast with the strengthening mechanism of the pre-deformed AA2195-T8 rolled products.
机译:AA2195合金的直接冷铸(DC)铸锭板的使用最近已扩展到塑料和汽车工业中的大型模具应用。使用Factsage热力学软件在平衡和非平衡条件下研究了铸态AA2195合金的微观组织演变,并将其与差示扫描量热(DSC)分析和微观结构观察的结果进行了比较。铸态组织表现出在铝枝晶边界形成Al_2CuMg,Al_2Cu和Al_2CuLi金属间相,在固溶处理过程中可以完全溶解在a-Al基体中。经过T6热处理后,AA2195铸造合金的机械性能有了显着改善,这归因于形成了纳米级θ'(Al_2Cu)和Tl(Al_2CuLi)析出物。然而,T1析出物的不均匀分布以及大尺寸和低密度表明,9'析出物在增强AA2195铸造合金中的作用比T1析出物的强化作用更为明显。预变形的AA2195-T8轧制产品。

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