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2021 Vol.31, Issue 11 Preview Page
Change in Thermal Diffusivity of Al-Si-Mg-Cu Alloy According to Heat Treatment Conditions at Automotive Engine Operating Temperature

Al-Si-Mg-Cu 합금의 자동차 엔진 사용 온도에서 열처리 조건에 따른 열확산도 변화

Se-Weon Choi†
최 세원†
Korea Institute of Industrial Technology, Gwangju 61012, Republic of Korea
한국생산기술연구원
†Corresponding author E-Mail : choisw@kitech.re.kr (S.W. Choi, KETECH)
November 2021. pp. 642-648
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Abstract

The precipitation effect of Al-6%Si-0.4%Mg-0.9%Cu-(Ti) alloy (in wt.%) after various heat treatments was studied using a laser flash device (LFA) and differential scanning calorimetry (DSC). Solid solution treatment was performed at 535 °C for 6 h, followed by water cooling, and samples were artificially aged in air at 180 °C and 220 °C for 5 h. The titanium-free alloy Al-6%Si-0.4%Mg-0.9%Cu showed higher thermal diffusivity than did the Al-6%Si-0.4%Mg-0.9%Cu-0.2%Ti alloy over the entire temperature range. In the temperature ranges below 200 °C and above 300 °C, the value of thermal diffusivity decreased with increasing temperature. As the sample temperature increased between 200 °C and 400 °C, phase precipitation occurred. From the results of DSC analysis, the temperature dependence of the change in thermal diffusivity in the temperature range between 200 °C and 400 °C was strongly influenced by the precipitation of θ'-Al2Cu, β'-Mg2Si, and Si phases. The most important factor in the temperature dependence of thermal diffusivity was Si precipitation.

Keywords
Al-Si-Mg-Cu alloy
thermal diffusivity
thermal conductivity
aging heat treatment
precipitation
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 31
  • No :11
  • Pages :642-648
  • Received Date : 2021-09-15
  • Revised Date : 2021-10-13
  • Accepted Date : 2021-11-10
  • DOI :https://doi.org/10.3740/MRSK.2021.31.10.642
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