The multireflection grazing incidence X-ray diffraction method (MGIXD) was used to analyze the surface residual stresses in 7050 Al alloy samples. This technique can provide a non-destructive stress profile in function of sample depth, avoiding the relaxation effects intrinsic to destructive methods. The state of residual stress in aeronautical aluminium samples was modulated by milling and shot peening processes. After structural characterization, the residual stress states of the samples were analyzed by multireflection and conventional stress measurement methods. The milled samples presented tensile surface residual stress relaxation attributed to thermal effects and the shot peened samples showed strong compressive stress at sub-surface, which intensity was reduced near the surface. The residual stress profiles of the Al samples were obtained by MGIXD method that evidenced properties commonly undetected in conventional residual stress studies.

中文翻译：

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通过多反射掠入射 X 射线衍射进行无损表面残余应力分析：一项 7050 铝合金研究

采用多反射掠入射X射线衍射法(MGIXD)分析7050铝合金样品的表面残余应力。这种技术可以提供与样品深度有关的非破坏性应力分布，避免破坏性方法固有的松弛效应。航空铝样品的残余应力状态通过铣削和喷丸处理工艺进行调节。在结构表征后，通过多次反射和常规应力测量方法分析样品的残余应力状态。铣削样品呈现出由于热效应引起的拉伸表面残余应力松弛，喷丸处理样品在亚表面显示出强烈的压应力，其强度在表面附近降低。