Towards a better understanding of microstructural features on plasticity of 6061-Al alloy: neutron diffraction and scale transition model

The mechanical properties of metals are conditioned by the microstructural features such as the texture, grain size and shape, precipitates coupled with the effects of plastic anisotropy. The coupled effect of these microstructural features on the anisotropy of mechanical properties has not been studied thoroughly in the framework of polycrystal plasticity modelling. The proposal aims at investigating the internal strain being built under mechanical loading conditions. These intergranular strains can be interpreted thanks to polycrystalline models, disclosing the relative contributions of the different microstructural properties on the deformation modes. Collected neutron diffraction patterns will provide the comprehensive data set needed to quantify with accuracy the evolution of plastic anisotropy. This will enable to test and improve a novel model to predict the mechanical response.

金属的力学性能受织构、晶粒尺寸与形貌、析出相等微观结构特征，以及塑性各向异性效应共同调控。在多晶体塑性建模的框架下，上述微观结构特征对力学性能各向异性的耦合作用尚未得到充分研究。本研究旨在探究机械加载条件下产生的内部应变。借助多晶体模型可阐释此类晶间应变，进而揭示不同微观结构属性对变形模式的相对贡献。所采集的中子衍射（neutron diffraction）图样将提供精准量化塑性各向异性演化所需的完整数据集。此举将为测试并改进用于预测力学响应的新型模型提供支撑。