Processing Map and Microstructural Evolution of Isothermal Compressed an Al-Mg-Si-Cu-Zn Alloy

Li Zhen Yan; Yong An Zhang; Bai Qing Xiong; Zhi Hui Li; Xi Wu Li; Hong Wei Liu; Shu Hui Huang; Hong Wei Yan

doi:10.4028/www.scientific.net/MSF.877.575

Paper Titles

Effect of Heat Treatments on Stress Corrosion Behavior of 7050 Al Alloys in 3.5% NaCl Solution
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Refinement of Primary Silicon Crystals by Novel P-Doped γ-Al₂O₃ Particles in Solidification of Hypereutectic Al-Si Alloys
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Study of an Accelerated Aging Process for Conductive Aluminum Alloys
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Processing Map and Microstructural Evolution of Isothermal Compressed an Al-Mg-Si-Cu-Zn Alloy
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Precipitation of ScAl₃ Phase during Solutionizing and Ageing of Hypoeutectic Al-Sc Alloys and its Impact to Mechanical Properties
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Effect of Homogenizing Treatment on Microstructure and Property of Al-Zn-Mg-Cu-Zr Aluminum Alloy
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Effect of Zn, Mg, Cu, Zr on Microstructure and Properties of Laser Welding Aluminium Alloy
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Development of TiB₂ Dispersed Aluminum Composites by Spark Plasma Sintering
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HomeMaterials Science ForumMaterials Science Forum Vol. 877Processing Map and Microstructural Evolution of...

Processing Map and Microstructural Evolution of Isothermal Compressed an Al-Mg-Si-Cu-Zn Alloy

Abstract:

The hot deformation behavior of an Al-0.92Mg-0.78Si-0.20Cu-0.60Zn alloy was studied by isothermal compression in the temperature range from 350 to 500 oC with strain rates of 0.01-10s^-1 on Gleeble-1500 thermo-mechanical simulator. The microstructural evolution during hot deformation was investigated by electron back-scatter diffraction (EBSD). The results show that the strain rate and deformation temperature have significant influence on flow behavior, and the flow stress increases with increasing strain rate and decreasing deformation temperature. Processing map at the strain of 0.7 is obtained and exhibits three peak efficiency domains (380-420 oC at 0.01s^-1, 480-500 oC at 0.01s^-1 and 450-500 oC at 0.1-0.32s^-1). According to the processing map and microstructure observation, the optimized processing condition of hot deformation for the alloy is at 450-500 oC and strain rate of 0.1-0.32s^-1. The homogenized ingot is hot rolled at 480 oC with a strain rate of 0.1s^-1 based on optimized deformation parameters. The fraction of high-angle grain boundary is 35.2%, which is in accord with microstructure after hot deformed at 500 oC with a strain rate of 0.1s^-1.