A theoretical investigation of the effect of precipitate habit plane on plastic anisotropy in age hardenable aluminium alloys

Abstract

In the present investigation, a generalized framework to capture the effect of precipitate habit plane and crystallographic texture of the matrix on plastic anisotropy of precipitation hardenable aluminium alloys is established. In order to simultaneously consider the effect of precipitates and crystallographic texture, the upper bound yield locus is modified suitably by integrating a plastic inclusion model with the Taylor–Bishop–Hill method. It was observed that in the presence of precipitates, anisotropy in the Lankford parameter decreases with precipitates on the {100}Al habit plane being the most effective. With respect to strength anisotropy, it was observed that precipitates on the {100}Al habit plane tend to reduce texture induced anisotropy, whereas precipitates on the {110}Al and {111}Al habit planes tend to enhance texture induced anisotropy. Additionally, it was observed that the deviation from ideal axisymmetric loading is reduced in the presence of precipitates. It was found that the generalized framework developed in the present investigation can successfully explain the evolution of anisotropy in the yield strength, yield locus and Lankford parameter in different age hardenable aluminium alloys.