Development and Validation of Extrusion Limit Diagram for AZ31 and AM30 Magnesium Alloys

Wang, Ying Xin; Zeng, Xiaoqin; Ding, Wenjiang; Luo, Alan A.; Sachdev, Anil K.

doi:10.4028/0-87849-432-4.327

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Flow Stress Calculation1

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2007

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“…The calculation of both extrusion force and temperature rise during the extrusion process is relative to the flow stress determined by the deformation temperature (T) and strain rate ( ε& ) during the hot deformation of a material [6]. On the other hand, Zener-Hollomon (Z) parameter incorporates the two control variables T and ε& through an Arrhenius function [7], that is,…”

Section: Flow Stress Calculationmentioning

confidence: 99%

Development and Validation of Extrusion Limit Diagram for AZ31 and AM30 Magnesium Alloys

Wang

Zeng

Ding

et al. 2007

MSF

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Uniaxial hot compression tests were performed at constant temperature (T) and strain rate (ε& ) in the ranges of 200-500 °C at an interval of 50 °C and 0.001-20 s-1. The flow stress data were used to develop the extrusion limit diagram for AZ31 and AM30 magnesium tubes. The extrusion limit diagram shows a wide region available for extruding AZ31 and AM30 seamless tubes, and comparison of the two extrusion limit diagrams shows that, the extrudability of AM30 alloy is better than that of AZ31 alloy. Actual extrusion trials validated the predicted temperature rise limit curve corresponding to the occurrence of surface cracking during the extrusion process. Magnesium tubes were successfully extruded according to the safe regions identified by the extrusion limit diagram.

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Section: Flow Stress Calculationmentioning

confidence: 99%