소성∙가공 (Transactions of Materials Processing)

  • 제12권6호
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  • Pages.588-596
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  • 2003
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  • 1225-696X(pISSN)
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  • 2287-6359(eISSN)
한국소성∙가공학회 (The Korean Society for Technology of Plasticity and materials processing)
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열처리에 따른 다공성 알루미늄 합금 재료의 미세구조와 기계적 성질 변화

Evolution of Microstructure and Mechanical Properties of Porous Al Alloy Under Various Heat Treatment

  • 류관무 (인하대학교 신소재공학부) ;
  • 권영재 (인하대학교 소재연구소) ;
  • 김준규 (인하대학교 소재연구소) ;
  • 조원승 (인하대학교 신소재공학부) ;
  • 조남희 (인하대학교 신소재공학부) ;
  • 황진명 (인하대학교 신소재공학부) ;
  • 유연철 (인하대학교 신소재공학부)
  • 발행 : 2003.10.01
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초록

The relationships between evolution of microstructure and mechanical properties of porous Al-3Si-2Mg-2Cu alloy after the foaming and various heat treating were investigated. The foamed alloy having various densities were manufactured by powder compact foaming and heat treated. Then compression test was performed with deformation rate of 0.5/s. The ultimate compression strength was not changed after solution heat treatment but the flow curve after ultimate strength showed very smooth and uniform plateau region. This change of flow curve means that the deformation mechanism is altered from brittle fracture to ductile deformation and the energy absorption property of Al foam is dramatically improved. The improvement of energy absorption without any detriment of mechanical properties is due to that the very brittle precipitation like Al-Cu and Al-Mg was uniformly dissolved in Al matrix after solution heat treatment. And various mechanical properties of Al alloy porous material were improved by 40% with aging of $200^{\circ}C$ and 50min. These improvements are ascribe to the various fine precipitates like $\Omega$ and $\theta$'.

키워드

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피인용 문헌

  1. An analytical study on prediction of effective elastic constants of perforated plate vol.19, pp.12, 2005, https://doi.org/10.1007/BF02916462