Effects of Extrusion Ratio on Microstructures and Properties of Al-Cu-Mg-Ag-Ce-Er Alloy Wires

Abstract:

The Al-Cu-Mg-Ag-Ce-Er alloy wires with different extrusion ratio (λ=12, 25, 50, 100) were produced by hot extrusion at 450oC. The effects of extrusion ratio on the microstructures, tensile strength and elongation of Al-Cu-Mg-Ag-Ce-Er alloy wires were researched by means of OM, SEM, TEM and mechanical test.The results show that with the extrusion ratio increasing, the average grain size decreased from 83μm to 42μm, the Al₂Cu, Al₈Cu₄Ce and Al₈Cu₄Er phases was broken gradually, and the homogeneousdistribution about these second-phases in the alloy wires increased. The tensile strength increased from 366MPa to 459MPa with extrusion ratio, and the elongation initially decreased and then increased with the increase of extrusion ratio. Dynamic recrystallization for Al-Cu-Mg-Ag-Ce-Er alloy occurred at different extrusion ratios. Withincreasing of extrusion ratio, the main nucleation mechanism of dynamic recrystallization changed from the sub-grain coalescence at lower extrusion ratioto the acceleration of second-phases for nucleation at higher extrusion ratio.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 191-198
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.191
• Online since: June 2017
• Authors: Yu Peng Xu, Ze Sheng Ji*
• Keywords: Al-Cu-Mg-Ag-Ce-Er Alloy, Dynamic Recrystallization, Extrusion Ratio, Nucleation Mechanism

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