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용탕단조법에 의한 AC4A / SiCw 복합재료의 인장특성과 미세조직
문경철,이준희 ( Kyung Cheol Moon,Jun Hee Lee ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.2
N/A Macro and micro structures by optical microscope(OM), scanning electro microscope(SEM) and transmission electro microscope(TEM) of AC4A/SiCw 10-30v/o reinforced composites were observed. Fracture mode of AC4A alloy was appeared to be plastic. But fracture mode of composites were appeared to be almost elastic. And that was occured very well with increasing of SiC whisker volume fraction. Mechanical characteristics of preformed SiC whisker reinforced composites by squeeze casting technique were more affected by squeezing pressure than temperature of molten metal. Distribution of dislocations at matrix of composites was uniform. But the number of dislocations around whisker of composites was much more than in matrix. These diffraction pattern were [011] direction for both matrix and around whisker.
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용탕 단조법에 의한 AC4A/Si$C_w$복합재료 제조에 관한 연구 (I)
문경철,이준희,Moon, Kyung-Cheol,Lee, Jun-Hee 한국재료학회 1992 한국재료학회지 Vol.2 No.6
최근 선진국에서 강화되고 있는 CAFE(Corporate Average Fuel Economy :기업평균연비) 규제를 극복하기 위해서는 차량의 경량화가 필수적이며 이를 위해 기존의 금속재료에 비하여 비강도, 탄성계수, 인성등이 우수한 기계적 성질을 가지면서 고분자 기지의 복합재료에 비해서 고온강도, 전기 및 열전도도와 내마모성이 우수한 금속기지 복합재료의 개발은 필수적이고도 중요한 위치를 차지한다. 따라서 본 연구에서는 자동차용 부품재 및 일반산업용 재료로 사용되고 있는 AC4A Al합금에 Si$C_w$prefohm을 용탕 단조법으로 강화하여 복합재료를 제조란 후 matrix와 함계 기계적성질, 마멸특성, 조직실험을 행한 결과 용탕 단조법에 의한 AC4A/Si$C_w$ 복합재료의 최적 제조조건은 용탕온도 80$0^{\circ}C$, 금형은도 40$0^{\circ}C$, preform은도 750-80$0^{\circ}C$, 가압압력 75MPa이었으며 Si$C_w$강화재가 I/M재에 비하여 경도값은 두배이상으로 상승하였고 Si$C_w$ 20v/o에서는 가압에 의한 큰 효과는 없었다. A fabrication process for SiC whisker preform reinforced AC4A Al composites is being developed. The Al alloy used as the matrix in this study is AC4A. SiC whisker preform made by Tokai Carbon Co. Ltd. Shizuoka, Japan were used. These consisted of $\beta$-type single crystals 0.1 ~ 10${\mu}$m in diameter and 20~10${\mu}$m in length. The most adequate fabrication condition was that whisker preform was preheated up to 750~80$0^{\circ}C$, set into a mould preheated to ~40$0^{\circ}C$, molten Al alloy heated to ~80$0^{\circ}C$ and applied pressure 75MPa. And Si$C_w$reinforced AC4A composite was advanced above twice than AC4AI/M. Also it was not large effect by pressure at Si$C_w$ 20v/o.
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용탄단조법에 의한 AC4A/SiCw 복합재료 제조에 관한 연구 (3) -기계적 특성-
문경철,이준희,윤의박 ( Kyung Cheol Moon,Jun Hee Lee,Eui Pak Yoon ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.3
This was studied about mechanical characteristic of AC4A/SiCw 10-30% reinforced composites. Tensile strength of pressed base metal(base metal) with SiCw preform was higher than without pressed base metal(AC4A) If SiCw whisker volume fraction was increased, tensile strength at room temperature was increased. And tensile strength of SiCw 30% was about 35㎏/㎟. Tensile strength of SiCw 30% 400℃ at same time aging was the most excellence, about 40㎏/㎟ The fracture energy value of composite material at three point bending test was higher than AC4A. Dislocation at matrix of composite material was evenly distributed. But dislocation around whisker of composite material was more existed than matrix. The reasom was thought of pile-up around whisker.
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