Effect of aging treatment on microstructure and mechanical properties of AlSi9Cu3 HPDC aluminum alloy

doi:10.13251/j.issn.0254-6051.2022.04.008

Abstract

Abstract: Effect of aging treatment (T5 treatment, 160 ℃ for 6 h) on microstructure, mechanical properties and tensile fracture morphology of AlSi9Cu3 HPDC aluminum alloy was studied by means of tensile test, optical microscope (OM), scanning electric microscope (SEM) and energy disperse spectroscopy (EDS) analysis. The results indicate that microstructure of the aged AlSi9Cu3 HPDC alloy is composed of equiaxed primary α-Al, eutectic Si and precipitated phase of θ-Al₂Cu and α-Fe. The precipitated phase θ-Al₂Cu is observed on the grain boundary, which results in significant increase of tensile strength and hardness of the AlSi9Cu3 alloy. After aging, the tensile strength, yield strength, elongation and hardness of the AlSi9Cu3 alloy can reach 375 MPa, 258 MPa, 4.0% and 94 HBW, respectively. Meanwhile, the quasi cleavage fracture and a small amount of intergranular fracture are observed at tensile fracture of the AlSi9Cu3 alloy.

Key words: AlSi9Cu3 HPDC aluminum alloy, aging, microstructure, tensile properties, fracture morphology

CLC Number:

Chen Dongjun, Li Guangyang, Liu Gang. Effect of aging treatment on microstructure and mechanical properties of AlSi9Cu3 HPDC aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(4): 53-56.

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