DOI QR코드

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Al-Li-Ce계 합금의 미세조직 및 기계적 특성에 미치는 Mg 첨가의 영향

Effect of Mg Addition on the Microstructure and Mechanical Properties of Al-Li-Ce Alloys

  • 이병권 (한국생산기술연구원 동력소재부품연구그룹) ;
  • 고은찬 (한국생산기술연구원 동력소재부품연구그룹) ;
  • 김용호 (한국생산기술연구원 동력소재부품연구그룹) ;
  • 유효상 (한국생산기술연구원 동력소재부품연구그룹) ;
  • 손현택 (한국생산기술연구원 동력소재부품연구그룹) ;
  • 홍성길 (전남대학교 신소재공학과)
  • Byeong-Kwon Lee (Automotive Materials & Components R&D Group, Korea Institute of Industrial Technology) ;
  • Eun-Chan Ko (Automotive Materials & Components R&D Group, Korea Institute of Industrial Technology) ;
  • Yong-Ho Kim (Automotive Materials & Components R&D Group, Korea Institute of Industrial Technology) ;
  • Hyo-Sang Yoo (Automotive Materials & Components R&D Group, Korea Institute of Industrial Technology) ;
  • Hyeon-Taek Son (Automotive Materials & Components R&D Group, Korea Institute of Industrial Technology) ;
  • Sung-Kil Hong (Department of Materials Science and Engineering, Chonnam National University)
  • 투고 : 2023.08.08
  • 심사 : 2023.09.22
  • 발행 : 2023.10.27

초록

In this study, changes in the microstructure and mechanical properties of cast and extruded Al-2Li-1Ce alloy materials were investigated as the Mg content was varied. The density decreased to 2.485, 2.46 and 2.435 g/cm3 when the Mg content in the Al-2Li-1Ce alloy was increased to 2, 4 and 6 wt%, respectively. Intermetallic compounds of Al11Ce3 were observed in all alloys, while the β-phase of Al3Mg2 was observed in alloys containing 6 wt% of Mg. In the extruded material, with increasing Mg content the average grain size decreased to 84.8, 71.6 and 36.2 ㎛, and the fraction of high-angle grain boundaries (greater than 15°) increased to 82.8 %, 88.6 %, and 91.8 %, respectively. This occurred because the increased Mg content promotes dynamic recrystallization during hot extrusion. Tensile test results showed that as the Mg content increased, both the yield strength and tensile strength increased. The yield strength reached 86.1, 107.3, and 186.4 MPa, and the tensile strength reached 215.2, 285, and 360.5 MPa, respectively. However, it is worth noting that the ductility decreased to 27.78 %, 25.65 %, and 20.72 % as the Mg content increased. This reduction in ductility is attributed to the strengthening effect resulting from the increased amount of dissolved Mg, and grain refinement due to dynamic recrystallization.

키워드

과제정보

This work was supported by the 'Development of common base technology for medium power industrial motors' of Korea Institute of Energy Technology valuation and Planning (KETEP) funded by the Ministry of Trade, Industry and Energy, Republic of Korea (RS-2023-00232593).

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