The detection and control of internal residual stress in light magnesium alloy components has a strong technical demand in aerospace manufacturing field, especially in high precision control system. Residual stress caused by non-uniform plastic deformation, plastic deformation generated by thermal stress, volume change caused by phase change or precipitation and chemical action, will lead to workpiece deformation to produce large size error and affect the assembly and use, serious cracking. How to measure and obtain the size and distribution of residual stress in materials is the primary problem in the study of residual stress formation and reduction control.

Professor Zhang Jin from the University of Science and Technology Beijing and Professor Zheng Lin from the Southwest Institute of Technology and Engineering et al. determined the internal residual stress of 5mm thick magnesium alloy plate for the first time at home and abroad by using self-developed short-wavelength characteristic X-ray diffraction technique. The characteristic diffraction spectrum and the distribution of residual stress along the thickness of the extruded ME21 magnesium alloy sheet were obtained, which indicated that the transverse residual stress gradient of the sheet was larger than that in the extruded direction. In addition, homogenizing annealing before extrusion can weaken the internal texture, reduce the maximum residual stress, and make the distribution of residual stress more uniform.

The detection and control of internal residual stress in light magnesium alloy components has a strong technical demand in aerospace manufacturing field, especially in high precision control system. Residual stress caused by non-uniform plastic deformation, plastic deformation generated by thermal stress, volume change caused by phase change or precipitation and chemical action, will lead to workpiece deformation to produce large size error and affect the assembly and use, serious cracking. How to measure and obtain the size and distribution of residual stress in materials is the primary problem in the study of residual stress formation and reduction control.

Professor Zhang Jin from the University of Science and Technology Beijing and Professor Zheng Lin from the Southwest Institute of Technology and Engineering et al. determined the internal residual stress of 5mm thick magnesium alloy plate for the first time at home and abroad by using self-developed short-wavelength characteristic X-ray diffraction technique. The characteristic diffraction spectrum and the distribution of residual stress along the thickness of the extruded ME21 magne