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- 저자 : 홍종휘 ( Joo Hong Lee (검색결과 2 건)
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일방향응고시킨 Ni 기 (基) 초내열 (超耐熱) 공정복합재료에 관한 연구
이주홍,홍영환,홍종휘 ( Joo Hong Lee,Young Hwan Hong,Jong Hwi Hong ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.4
N/A The effect of interlamellar spacing on microstructural stability at high temperature was studied for unidirectionally solidified ternary Ni / Ni₃ Al-Ni₃ Nb and binary Ni-Ni₃Nb eutectic composite. The interlamellar spacing of both alloy systems were varied with the growth rate according to λ²R=constant relationship. As a result of isothermal heat treatments at high temperature it was considered that coarsening of lamellar structure was due to concentration gradient between the tip with a relatively small radius of curvature and the side of the thick lamellae with a larger radius of the opposite sign. Fault density was increased as the interlamellar spacing decreased. Therefore it is also considered that the higher coarsening rate of the specimen with the smaller interlamellar spacing was due to higher fault density. And the diference of coarsening rate between Ni / Ni₃Al-Ni₃Nb and Ni-Ni₃Nb eutectic composites was not observed when the interlamellar spacing was similar in size. This means that the presence of γ` in γ/γ` -δ eutectic had no b arrier effect to diffusion through the γ matrix.
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홍종휘,이현규,김영수,홍영환 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.7
The effect of interlamellar spacing on microstructural stability, tensile behavior and fracture mode at high temperature has been studied for unidirectionally solidified Al-CuAl₂ eutectic. The results of isothermal heat treatments showed the higher coarsening rate at 520℃ than at 450℃. It was observed that the decrease of interface area(Δ5) was inversely proportional to the square of the interlamellar spacing(λ²). Therefore, it can be seen that the microstructural stability at high temperature improves as the interlamellar spacing increases. The tensile properties at high temperature improved as the interlamellar spacing increased, which is opposite behavior at room temperature. The Al-CuAl₂eutectic exhibited brittle fracture mode below the temperature at which the reinforcing materials softened but ductile fracture mode above the temperature.
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