Abstract

A method is proposed to calculate the microscopic residual stresses in extruded cylindrical samples of non-ageing aluminium alloy 5083 (Al–Mg), arising from quenching in fresh water from 530°C. We start from the premise that the alloy is single-phase and non-isotropic on a microscopic scale; it consists of many grains that exhibit different mechanical response depending on their crystallographic orientation and neighboring grains. Microscopic residual stresses depend on the applied heat treatment, microstructure and mechanical strength of the individual grains. The stresses were calculated from neutron diffraction data. Genetic programming algorithms were used to calculate microscopic residual stresses, considering that each diffraction peak describes the stress distribution of a group of grains having a certain orientation, size and environment. The algorithm assigns a stress value to each grain according to the distribution of the diffraction peaks and the microstructural parameters of these grains.

中文翻译：

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热处理后挤压铝合金试样的微观残余应力研究

摘要

提出了一种计算非时效铝合金 5083 (Al-Mg) 挤压圆柱形样品的微观残余应力的方法，该应力是在 530°C 的淡水中淬火产生的。我们从合金在微观尺度上是单相和非各向同性的前提出发；它由许多晶粒组成，这些晶粒根据其晶体取向和相邻晶粒表现出不同的机械响应。微观残余应力取决于施加的热处理、微观结构和单个晶粒的机械强度。根据中子衍射数据计算应力。考虑到每个衍射峰描述了具有特定取向、尺寸和环境的一组晶粒的应力分布，遗传编程算法被用于计算微观残余应力。