Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Hyper-peritectic Al-Ti Alloys as In-Situ composites through Rapid Solidification

급냉응고법에 의한 In-Situ 복합재료로서의 과포정 Al-10wt%Ti 합금(I)

  • Kim, Hye-Seong (Metals Division, Korea Institute of Science and Thchnology) ;
  • Geum, Dong-Hwa (Metals Division, Korea Institute of Science and Thchnology) ;
  • Kim, Geung-Ho (Division of Ceramics, Korea Institute of Science and Technology)
  • 김혜성 (한국과학기술연구원 금속연구부) ;
  • 금동화 (한국과학기술연구원 금속연구부) ;
  • 김긍호 (한국과학기술연구원 금속연구부)
  • Published : 1999.03.01
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Abstract

In this study, a new concept of aluminum-matrix composites and the possibility of in-situ processing are suggested, and preliminary results on AI- Ti system are presented. Fine powders of AI-lO% Ti were prepared by the gas atomization so that fine $Al_3Ti$ formed into flake shape. A 25v/o $Al_3Ti/Al$ composite sample was made by the pow­d er metallurgy process involving hot extrusion. Microstructure and mechanical behavior both at room temperature and high temperatures were analysed by OM, SEM, TEM and tension test. Microstructural characteristics and mechanical properties of the composites exhibited similar behavior to those of $SiC_w/2124$ composites. Merits and drawbacks of the $Al_3Ti/Al$ composites are discussed together with a possibility of further improvement.

본 연구에서는 Al-기지 복합재료의 새로운 개념과 in-situ 공정의 가능성을 Al-Ti계의 연구결과들을 토대로 제시하고자 하였다. 가스아토마이제이션법에의해 $Al_3Ti$가 미세한 편상형상을 갖도록 Al-10%Ti 조성의 합금분말을 제조하고, 고온 압출 공정을통하여 25V/o $Al_3Ti/Al $ 복합재를 제조하였다. 복합재의 미세구조를 광학현미경, SEM, TEM 등을 이용하여 조사하였고, 상온과 고온에서의 기계적 특성을 인장시험을 통하여 측정하였다. 제조된 복합재료의 미세구조 및 고온 기계적 성질을 상용되고 있는 $SiC_w/2124$ 복합재료와 유사한 거동을 보여준다. 제조된 $Al_3Ti/Al$ 복합재료의 장점과 단점이 물성향상의 가능성과 더불어 제시되었다.

Keywords

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