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As a typical aluminumAluminum–silicon castingCasting alloy, A356 has excellent strength and toughness after T6 heat treatmentT6 heat treatment, and is often used in automotiveAutomotive parts. In order to study the microstructureMicrostructure and mechanical propertiesMechanical properties of A356 after heat treatmentHeat treatment, castingsCasting in different thickness were obtained by stair castingCasting and T6 heat treatmentT6 heat treatment. The samples of different castingCasting thicknesses and sampling locations were selected, and the microstructureMicrostructure and performance of the samples in as-cast and T6 treated condition were compared. The results show that cooling rateCooling rate can directly affect SDAS, while the proportion of eutectic phase has an obvious effect on tensile strengthTensile strength. T6 heat treatmentT6 heat treatment can greatly reduce and refine the inter-dendriteDendrites eutectic structureEutectic structure. The tensile strengthTensile strength and elongation of A356 alloyA356 alloy are improved after heat treatmentHeat treatment. And it is found that the relationship between microstructureMicrostructure and properties can be characterized by Hall–PetchHall-Petch relation formula.

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Effect of T6 Heat Treatment on Microstructure and Mechanical Properties of A356 Aluminum Alloy

  • 会议论文

  • 发表日期：

    2025年

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  • Shaoguang Yang,
  • Junming Chen,
  • Lu Jin,
  • Aimin Zhao

摘要

As a typical aluminumAluminum–silicon castingCasting alloy, A356 has excellent strength and toughness after T6 heat treatmentT6 heat treatment, and is often used in automotiveAutomotive parts. In order to study the microstructureMicrostructure and mechanical propertiesMechanical properties of A356 after heat treatmentHeat treatment, castingsCasting in different thickness were obtained by stair castingCasting and T6 heat treatmentT6 heat treatment. The samples of different castingCasting thicknesses and sampling locations were selected, and the microstructureMicrostructure and performance of the samples in as-cast and T6 treated condition were compared. The results show that cooling rateCooling rate can directly affect SDAS, while the proportion of eutectic phase has an obvious effect on tensile strengthTensile strength. T6 heat treatmentT6 heat treatment can greatly reduce and refine the inter-dendriteDendrites eutectic structureEutectic structure. The tensile strengthTensile strength and elongation of A356 alloyA356 alloy are improved after heat treatmentHeat treatment. And it is found that the relationship between microstructureMicrostructure and properties can be characterized by Hall–PetchHall-Petch relation formula.