Effect of pulse current on microstructure and mechanical properties of aged Al-Cu-Mn-Zr alloy

doi:10.13251/j.issn.0254-6051.2023.04.017

Abstract

Abstract: Effect of pulse current density on microstructure and mechanical properties of Al-Cu-Mn-Zr alloy after aging was studied by means of mechanical properties testing and microstructure and fracture morphology observation. The mechanism of pulse current in the aging process was analyzed from the point of view of thermodynamics and dynamics. The results show that pulse current promotes the nucleation of precipitated phase of the Al-Cu-Mn-Zr alloy by facilitating vacancy transitions, which reduces the size of second phase and makes the precipitated phase change from continuous to dispersive distribution on the grain boundaries. When the pulse current density is 15 A/mm², the mechanical properties of the Al-Cu-Mn-Zr alloy reach the peak, and the tensile strength and elongation are 444.6 MPa and 8.4%, respectively, which are 52.8% and 50% higher than those without electric pulse.

Key words: pulse current, aging treatment, Al-Cu-Mn-Zr alloy, mechanical properties, microstructure

CLC Number:

TG166.3

Cai Chunbo, Gao Shaowei, Gao Guili, Shi Dequan. Effect of pulse current on microstructure and mechanical properties of aged Al-Cu-Mn-Zr alloy[J]. Heat Treatment of Metals, 2023, 48(4): 104-110.

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