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Effect of natural ageing and pre-straining on strength and anisotropy in aluminium alloy AA 6016

机译：自然时效和预应变对AA 6016铝合金强度和各向异性的影响

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摘要

During processing of age-hardenable AA 6xxx series alloys for automotive applications the sheets may experience significant time spans between solution heat treatment at the aluminium supplier and age hardening upon the final paint bake cycle at the carmaker. Natural ageing during these pause times and intermediate deformations by sheet levelling or forming operations both affect materials properties of autobody sheet In the present study we explore the impact of a combination of natural ageing and pre-straining on the tensile properties and the in-plane anisotropy of alloy AA 6016. Materials properties are modelled with the help of a nano-scale material model called NaMo, which consists of a precipitation model simulating the formation of clusters and phases upon natural ageing as input to a mechanical model simulating the evolution of yield strength and work hardening as a function of natural ageing and pre-straining. Plastic anisotropy is modelled by polycrystal-plasticity simulations under consideration of latent hardening to account for strain path change effects introduced by the pre-straining.
机译：在汽车用可时效硬化的AA 6xxx系列合金的加工过程中，板材在铝供应商的固溶热处理与汽车制造商的最终烤漆周期之间的时效硬化之间可能会经历很长的时间跨度。在这些停顿时间内的自然时效以及通过板材整平或成型操作产生的中间变形均会影响车身板材的材料性能。在本研究中，我们探索自然时效和预应变相结合对拉伸性能和面内各向异性的影响的材料是AA 6016合金。通过称为NaMo的纳米级材料模型对材料属性进行建模，该模型包括一个沉淀模型，该模型模拟自然时效时簇和相的形成，并将其作为模拟屈服强度演变的机械模型的输入。并根据自然时效和预应变来硬化工作。考虑到潜在硬化，通过多晶塑性模拟对塑性各向异性进行建模，以考虑预应变引入的应变路径变化效应。

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