Mechanical Behavior of Processed AZ91D by Equal Channel Angular Extrusion during Semi-Solid Isothermal Compression

Ju Fu Jiang; Shou Jing Luo

doi:10.4028/www.scientific.net/SSP.116-117.530

Paper Titles

Development of Aluminum-Lithium Alloys Processed by the Rheo Container Process
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Development of In-Ladle Direct Thermal Control (DTC) Rheocasting Process
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Analysis of the Age-Hardening T5 Treatment in a Al-7%Si-0.6%Mg-0.5%Cu Rheo-Cast Alloy
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The Effect of Stirring Current and Stirring Time on Microstructure and Mechanical Properties in Rheo Die Casting Process
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Mechanical Behavior of Processed AZ91D by Equal Channel Angular Extrusion during Semi-Solid Isothermal Compression
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Fluidity and Microstructures Characteristics of AZ 91D by Using New Type Semi-Solid Injection Process
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Microstructural Evolution of A206 Al Alloy by In-Ladle DTC Rheocasting
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The Effect of Electromagnetic Stirring on the Semi-Solid Microstructure of High-Melting Alloys
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Control of Semi-Solid Microstructure of AZ91D Mg Alloys by the Electromagnetic Stirring
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Mechanical Behavior of Processed AZ91D by Equal Channel Angular Extrusion during Semi-Solid Isothermal Compression

Abstract:

Mechanical behavior of processed AZ91D magnesium alloy by equal channel angular extrusion during semi-solid isothermal compression was investigated using semi-solid isothermal compression test. The results show that there are four stages, drastic increase of true stress, drastic falling of true stress, steady stage and increase of true stress. With the increase of holding time or deformation temperature, required true stress for obtaining same true strain falls evidently and peak stress and steady stress also fall in true stress-strain curve. With increasing strain rate, steady stress also increase. Peak stress will increase or decrease with the sudden increase or fall of strain rate. During semi-solid isothermal compression, plastic deformation of semi-solid billet mainly depends on plastic deformation of solid phases and their rotation and sliding. Coarse grains occur in upper position adjacent to compression die’s surface and fine grains occur in the central and free surface positions of billets.