Surface Stress Measurement of Aluminum Alloy by X-Ray Diffraction Method

Abstract:

Surface residual stress distributions introduced by several surface treatments of 7075 aluminum alloy were acquired by non-destructive X-ray diffraction method. On the one hand, stress evolutions of the surface treated specimens were measured and analyzed to guide laboratory tests and engineering practices. On the other hand, the advantages of X-ray diffraction method in some test cases and reliability and accuracy of the measurements are discussed compared with the center hole-drilling method. The results show that X-ray method is flexible and accurate especially in measuring shallow surface layers stresses, which may be difficult or even be impossible to measure using traditional mechanical test methods. Different surface treatments introduce various distributed stresses and the latter treatment may remove the effects of the former one, so a practical treatment containing portable grinding wheel polishing, cross fine metallographic grinding machine polishing or low-speed milling, and mechanical polishing or electropolishing is suggested which can reduce the effects of external stresses introduced by surface treatments.

• Periodical: Advanced Materials Research (Volumes 393-395)
• Pages: 343-348
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.393-395.343
• Online since: November 2011
• Authors: Shao Jie Wei, Kai Liao
• Keywords: 7075 Aluminum Alloy, Residual Stress, Surface Treatment, X-Ray Diffraction Method

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