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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

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Novel Flexible SSM and HPDC Equipment to Process Secondary Aluminium Alloys for Decarbonising Lightweight Parts in Automotive Sector
A Theory for Designing Ductile Materials with Anisotropy
Assessing the Impact of Texture and its Gradients on the Forming Limits of an AA6xxx Sheet Alloy
D-35: Development of New Magnesium Alloy Strengthened by Nano Second Phase Precipitation
D-36: Issues of Castability of Magnesium Alloys
Effect of Split Sleeve Cold Expansion on the Residual Stress, Texture and Fatigue Life of Rolled AZ31B Magnesium Alloy
Increasing the Strength and Electrical Conductivity of AA6101 Aluminum by Nanostructuring
Influences of SiC Particle Additions on the Grain Refinement of Mg-Zn Alloys
Mechanical and Microstructural Characterization of Ultrasonic Metal Welded Large Cross Section Aluminum Wire/Copper Terminal Joints
The Dependence of Local Strain Distribution on Quench Rate for Extruded Al-Mg-Si-Mn-Fe Alloys
The Effect of through Thickness Texture Variation on the Anisotropic Mechanical Response of an Extruded Al-Mn-Fe-Si Alloy
The Effects of Strontium Addition on the Microstructures and Mechanical Properties of Al-7Si Alloy Reinforced with In-situ Al3Ti Particulates

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