含有不同尺度量级第二相的高强铝合金拉伸延性模型

Model for tensile ductility of high strength Al alloys containing second particles of various sized scales

基于合金中不同尺度第二相在其断裂过程中的作用机制及位错理论 ,建立了高强铝合金中结晶相、沉淀相以及析出强化相性质与其拉伸延性间的多元非线性关系模型。结果表明对于 2 0 2 4铝合金的拉伸延性 ,该模型的预测值与相应的实验值吻合良好。同时借助于该模型的理论分析 ,可以得到在确保高强铝合金强度不降低的前提下提高其延性的优化方案。

A model was established for high strength aluminum alloys to present a nonlinear relation between the tensile ductility of the alloys with the characteristics of constituents, dispersoids, and precipitates within the alloys, based on both the roles of three second particles with various sized scales in the failure and the dislocation mechanism. The results show that the ductility to fracture obtained experimentally is well agreed with that predicted by the model for an aged 2024 aluminum alloy. Moreover, an optimum could be approached to promote the ductility, as well as maintain the strength of the alloys by means of comprehensive analyses to the model.