Dynamic Strain Aging during Tensile Deformation of Extruded AZ81 Magnesium Alloy

Si Qian Zhang; Liang Mao; Li Jia Chen

doi:10.4028/www.scientific.net/AMR.652-654.1937

Paper Titles

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Simulation of Microstructure Evolution on Copper, Aluminum and Alloy during ECAP
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Comparative Study on Compression Deformation Behaviors of Cast and Extruded AZ31 Alloys
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Dynamic Strain Aging during Tensile Deformation of Extruded AZ81 Magnesium Alloy
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Die Wear Analysis of Spur-Gear Shaft Hot Extrusion Process
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Forging Effect of Horizontal V - Shaped Anvil for Heavy Axial Forgings
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Influence of Temperature Difference on Front End Bending in Hot Slab Rolling
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Development of Cyclic Rotating Bending Process for Microstructure Control of AZ31 Magnesium Alloy Tube
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Dynamic Strain Aging during Tensile Deformation of Extruded AZ81 Magnesium Alloy

Abstract:

Serrated flow has been observed in AZ81 alloy during tensile deformation. The observed static strain ageing effect and negative strain rate sensitivity suggest that the serrated flow is due to interaction between dislocations and solute atoms, know as dynamic strain ageing (DSA). The Portevin-Le Chatelier effect is observed at temperatures between 150oC~200oC and 125oC~200oC. In the microstructure of deformed samples dislocations and twins is observed. It is suggested that the occurrence of the dynamic strain aging is associated with interactions between solute atoms and dislocations.