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The thermal stability of additively manufactured AlSi10Mg alloy is crucial for maintaining its mechanical performance in high-temperature applications. This study investigates the effects of heat treatment on the hardness and phase evolution of AlSi10Mg alloy using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and Vickers microhardness testing. The microhardness results reveal a significant reduction in hardness with an increase in heat treatment temperature, from 113.54 HV in the as-built condition to 73.31 HV at 354 °C, indicating the thermal softening behaviour. DSC analysis represents key phase transitions at 193.56 °C, 253.48 °C, 286.12 °C, 328.20 °C and 354.36 °C, which correlates with microstructural changes affecting mechanical properties. XRD analysis confirmed phase evolution, indicating the presence of both FCC and diamond cubic structures in as-build conditions and after thermal exposure. These findings provide an insight into the thermal behaviour of an additively manufactured AlSi10Mg alloy, aiding in optimizing its performance for high-temperature applications.

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Thermal Effects on Hardness and Phase Transformations in Additively Manufactured AlSi10Mg Alloy

  • 会议论文

  • 发表日期：

    2025年

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  • R. Ramesh,
  • Saurabh Gairola,
  • R. Jayaganthan,
  • M. Kamaraj

摘要

The thermal stability of additively manufactured AlSi10Mg alloy is crucial for maintaining its mechanical performance in high-temperature applications. This study investigates the effects of heat treatment on the hardness and phase evolution of AlSi10Mg alloy using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and Vickers microhardness testing. The microhardness results reveal a significant reduction in hardness with an increase in heat treatment temperature, from 113.54 HV in the as-built condition to 73.31 HV at 354 °C, indicating the thermal softening behaviour. DSC analysis represents key phase transitions at 193.56 °C, 253.48 °C, 286.12 °C, 328.20 °C and 354.36 °C, which correlates with microstructural changes affecting mechanical properties. XRD analysis confirmed phase evolution, indicating the presence of both FCC and diamond cubic structures in as-build conditions and after thermal exposure. These findings provide an insight into the thermal behaviour of an additively manufactured AlSi10Mg alloy, aiding in optimizing its performance for high-temperature applications.