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상향식 연속주조법으로 제조한 Al-Ni 공정복합재료의 응고조직 및 기계적 성질
권기균,홍준표,이계완 ( Kee Kyun Kwon,Chun Pyo Hong,Kye Wan Lee ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.1
N/A Continuous casting of the Al-Al₃Ni: eutectic composite was carried out by the upward continuous casting process. The morphology of the eutectic growth and the stability of solid-liquid interface were investigated under various growth conditions in an upward continuous casting. The effect of growth conditions on the mechanical properties of the Al-Al₃Ni eutectic composit was also investigated, and the results were compared with those by the Bridgman method. As for the results, it was possible to get the planar solid-liquid interface at the condition of G_L/ R=1.04×10^3℃sec/㎟. And the inter-rod spacing of Al-Al₃Ni eutectic composite was decreased with the increase of pulling speed. The reduction of inter-rod spacing & value of G_L/ R caused the increase of ultimate tensile strength in Al-Al₃Ni: eutectic composite. The ultimate tensile strengths of Al-Al₃Ni by the upward continuous casting were higher then those by the Bridgman method.
상향식 연속주조법으로 제조한 Al-Cu 공정 복합재료의 응고조직 및 기계적 성질
권기균,선우국현,이계완 ( Kee Kyun Kwon,Kuk Hyun Sunwoo,Kye Wan Lee ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.1
N/A Continuous casting of the Al-CuAl₂ eutectic composite was carried out by the upward continuous casting process. The morphology of the eutectic growth and the stability of solid-liquid interface were investigated under various growth conditions. It was possible to get the planar solid-liquid interface at the condition of G^L/ R=3.6×10^3℃sec/㎟. And the colony structures were formed at the conditions of C^L/ R < R=0.33×10^3℃sec/㎟. The inter-lamellar spacing of Al-CuAl₂eutectic composite was decreased with the increase of pulling speed. The reduction of inter-lamellar spacing & value of C^L/R caused the increase of ultimate tensile strength and Rockwell hardness in Al-CuAl₂ eutectic composite.
상향식 연속주조법에 의한 Al-Cu-Ni 3원합금의 응고조직에 관한 연구
권기균,이계완 ( Kee Kyun Kwon,Kye Wan Lee ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.5
N/A Continuous casting of the Al-Cu-Ni ternary eutectic alloys was carried out by the upward continuous casting process. The morphology of the ternary eutectic growth and the stability of solid-liquid interface were investigated under various growth conditions. It was possible to get the planar solid-liquid interface at the condition of G_L /R=3.59×10³sec/㎟ in Al-Cu-Ni ternary eutectic alloys. In Al-rich, Ni-rich and Cu-rich hypereutectics of Al-Cu-Ni ternary alloys, primary α, τ and θ dendrites have grown as the leading phase ahead of the ternary eutectic composites.