Influence of the precipitation of secondary phase on the thermal diffusivity change of Al-MgSi alloys
Applied Sciences (Switzerland), ISSN: 2076-3417, Vol: 8, Issue: 11
2018
- 13Citations
- 28Captures
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Article Description
Al-Si-Mg alloys are investigated to determine the relationship between changes in the thermal diffusivity and precipitation behavior of the MgSi phase with various contents of MgSi and aging treatment conditions. The samples were solid solution-treated and then quenched with water (80 °C). Aging treatments were implemented at temperatures ranging from 180 to 240 °C for 5 h. The precipitation behavior of MgSi was observed using a heat flow curve using differential scanning calorimetry analysis. The thermal diffusivity of Al-MgSi alloy was affected by the precipitation of the MgSi phase, particularly in the meta-stable β phase. In the temperature range of precipitation occurrence, the thermal diffusivity of the alloy increased with the temperature when the precipitation of the meta-stable β phase of the sample was incomplete. However, at the same temperature, the samples in which precipitation had completed did not have any increased thermal diffusivity. The thermal diffusivity of the samples decreased when the meta-stable MgSi phase had dissolved in the matrix. The precipitation and dissolution of MgSi mainly affected the variation of thermal diffusivity in Al-Si-Mg. In contrast, the stable MgSi phase was not affected by changes in thermal diffusivity at a high temperature.
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