Microstructure and Mechanical Properties of AZ31 Mg Alloy Fabricated by Pre-compression and Frustum Shearing Extrusion |
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Authors: | Kun Sheng Li-Wei Lu Yao Xiang Min Ma Zhong-Chang Wang |
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Affiliation: | 1. Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material, Hunan University of Science and Technology, Xiangtan 411201, China;2. College of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;3. Department of Quantum Materials Science and Technology, International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose′ Veiga s/n, 4715-330 Braga, Portugal; |
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Abstract: | The AZ31 Mg alloys were processed by 6% pre-compression and frustum shearing extrusion at various temperatures, and the microstructure, texture and mechanical properties of the resulting alloys are systematically investigated. The results show that the grain size monotonically increases from 6.4 to 12.6 lm and the texture intensity increases from 6.7 to 9.6with the increase in the extrusion temperature. The combining effect of the pre-twinning and the frustum shearing deformation is found to contribute to the development of the weak basal texture in Mg alloys. The Mg alloy sheet produced at the extrusion temperature of 563 K exhibits excellent mechanical properties. The yield strength, ultimate tensile strength and elongation for the extruded alloys are 189.6 MPa, 288.4 MPa and 24.9%, respectively. Such improved mechanical properties are comparable or even superior to those of the alloys subjected to other deformation techniques, rendering the pre-compression and frustum shearing extrusion a promising way for further tailoring properties of Mg alloys. |
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Keywords: | AZ31 magnesium alloy Frustum shearing extrusion Microstructure Mechanical property Dynamic recrystallization |
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