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Meeting 2019 TMS Annual Meeting & Exhibition
Symposium TMS-DGM Symposium on Lightweight Metals: A Joint US-European Symposium on Challenges in Light Weighting the Transportation Industry
Presentation Title Effect of Split Sleeve Cold Expansion on the Residual Stress, Texture and Fatigue Life of Rolled AZ31B Magnesium Alloy
Author(s) Sasan Faghih, Sugrib Kumar Shaha, Seyed B Behravesh , Hamid Jahed
On-Site Speaker (Planned) Sugrib Kumar Shaha
Abstract Scope In this study, the feasibility of the split sleeve cold expansion of a wrought magnesium alloy was investigated. The process includes radial expansion of the hole at room temperature, in which magnesium alloys exhibit limited formability. The process has been successfully introduced in the rolled AZ31B Mg sheet and a preliminary evaluation of fatigue performance showed a significant improvement for the cold expanded hole compared to that of the starting condition. The microstructural analysis shows that microstructure near the hole is accommodating ex-pansion through texture evolution and grain refinements (i.e. elongated grains). The aggressive formation of twins within the grains near the hole surface is believed to be the main hardening mechanism in the very re-cent vicinity of the notch, where the maximum hardness was achieved. This mechanism alongside the compressive residual stress induced by the cold expansion process delayed crack initiation and suppressed crack propagation leading to high fatigue lives.
Proceedings Inclusion? Planned: Light Metals


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D-35: Development of New Magnesium Alloy Strengthened by Nano Second Phase Precipitation
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Effect of Split Sleeve Cold Expansion on the Residual Stress, Texture and Fatigue Life of Rolled AZ31B Magnesium Alloy
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