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Effect of vacuum annealing and characterization of diecast ADC12 aluminum alloys

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2021, 31(1), pp.24-31
  • DOI : 10.6111/JKCGCT.2021.31.1.024
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : November 26, 2020
  • Accepted : December 17, 2020
  • Published : February 28, 2021

ChiHoon Cho 1 Daseul Ham 2 seongchan oh 1 Su Yeon Cha 1 HYON CHOL KANG 1

1조선대학교
2조선대학교 재료공학과

Accredited

ABSTRACT

We report structural, mechanical, and thermal properties of diecast ADC12 aluminum alloys characterized using synchrotron X-ray diffraction (XRD), scanning electron microscopy, energy dispersive X-ray (EDX) analysis, thermal conductivity (λ), Vickers hardness (Hv), and stress-strain measurements. We also studied the effect of post-annealing performed in a vacuum atmosphere on the mechanical properties of diecast ADC12 alloys. EDX and XRD results revealed that Al2Cu and AlCu3 grains are formed, well dispersed in Al base and highly crystalline. Ultimate tensile strength (UTS) of 307.9 ± 9.1 MPa and elongation of 2.98 ± 0.62% were estimated. λ was 129.3 ± 0.27 W/m∙K and Hv was approximately 130. Both values were significantly higher than the reported values. At annealing temperatures ranging from 25 to 200°C, UTS and Hv values remained constant, while as the annealing temperature increased to 500°C, these values gradually decreased. This is because stabilization of the microstructure improves toughness and ductility.

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