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<p>In this paper, the effects of Sr and Cr additions on the microstructure, the morphologies of iron-rich intermetallics, and mechanical properties of cast 8021 aluminum alloys were investigated with scanning electron microscope and x-ray diffraction. The results indicate that the as-cast alloy exhibits the best mechanical properties with a combined addition of 0.4% Sr and 0.34% Cr. The uniaxial tensile strength and the yield strength of the sample reached 114&#xa0;MPa and 67.3&#xa0;MPa, respectively, and the elongation was 18.7%. The addition of Sr successfully modified the needle shape morphology of the β phase into Chinese script and short rod-shaped structures. The fracture surface of Sr-modified sample is dominated by fine dimples showing typical characteristics of ductile deformation. The effects of microalloying Sr and Cr on the grain size and grain distribution of 8021 aluminum alloys were discussed elaborately. Due to the addition of Sr, 8021 aluminum alloys achieved a good comprehensive performance such as ultimate elongation and tensile strength. The results presented in this work provide an important and effective way for the microstructural modification of aluminum foil alloys.</p>

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Modification Mechanism and Mechanical Properties of 8021 Aluminum Alloys

  • 期刊论文

  • 发表日期：

    2025年2月17日

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  • Wei Wang,
  • Qirui Sun,
  • Kunmo Zhang

摘要

In this paper, the effects of Sr and Cr additions on the microstructure, the morphologies of iron-rich intermetallics, and mechanical properties of cast 8021 aluminum alloys were investigated with scanning electron microscope and x-ray diffraction. The results indicate that the as-cast alloy exhibits the best mechanical properties with a combined addition of 0.4% Sr and 0.34% Cr. The uniaxial tensile strength and the yield strength of the sample reached 114 MPa and 67.3 MPa, respectively, and the elongation was 18.7%. The addition of Sr successfully modified the needle shape morphology of the β phase into Chinese script and short rod-shaped structures. The fracture surface of Sr-modified sample is dominated by fine dimples showing typical characteristics of ductile deformation. The effects of microalloying Sr and Cr on the grain size and grain distribution of 8021 aluminum alloys were discussed elaborately. Due to the addition of Sr, 8021 aluminum alloys achieved a good comprehensive performance such as ultimate elongation and tensile strength. The results presented in this work provide an important and effective way for the microstructural modification of aluminum foil alloys.