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반용융 성형가공한 SiCp / AZ91HP Mg 복합재료의 피로 및 내마모 특성
하홍수,김명균,안선규,임병수,김영직 ( Hong Soo Ha,Myoung Gyun Kim,Sun Kyu Ahn,Byeong Soo Lim,Young Jig Kim ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.5
N/A The effect of size and mass fraction of SiC particulate on the fatigue and wear have been investigated for semi-liquid formed SiCp/AZ91HP Mg composites. In the study, different particulate sizes of 7, 20, 50 ㎛ were prepared with various mass fraction for sample preparation. By tension-tension fatigue tests, whose procedures are standardized in ASTM standard 647E-93, the da/dN vs. ΔK curves were obtained. Also, the crack propagation paths were observed by optical microscope. As a result of wear test, specific wear loss is decreased with increasing mass fraction and particulate size. Specific wear loss of 30 mass% 50 ㎛ SiC reinforced Mg composite is compared to SKD11. (Received July 21, 1997)
교반법에 의한 AZ91HP/SiCp Mg 복합재료의 제조
김영직,이경태,하홍수 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.12
The objective of this work was to investigate the influences of the fraction of reinforcement(SiCp, 7㎛), stirring rate and melt rheology on the fabrication of AZ91HP/SiCp composites by the new method, stir-cylinder method. The stir-cylinder method was devised to solve the problems of the melt-stirring method by impeller. $quot;U$quot; shape melt surface, the characteristic shape of the stir-cylinder method prohibited the reinforcement agglomerations and gas poring in the melts. As the stirring rate increased, the area of $quot;U$quot; shape melt surface also increased which enhanced the addition of reinforcement. It was observed that the dispersity of reinforcement by the stir-cylinder method was better than that by the melt-stirring method by impeller. The sound composites added upto 30wt% of SiCp could be fabricated by the stir-cylinder method.
Mg 其他 複合材料의 强化材 量 및 分布에 따른 機械的性質特性
안선규,하홍수,김영직,임병수 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1
The effect of different SiC particle size and weight fraction in Mg/SiC particle MMC on the mechanical properties has been investigated. In this study, different particle sizes of 7㎛, 20㎛ and 50㎛ were prepared with various weight fraction of 10wt.%, 20wt.% and 30wt.% for sample preparation. By tension tests, the properties of ultimate tensile stress, yield stress and % elongation were observed and by tension-tension fatigue tests, whose procedures are standardized in ASTM standard 647E-93, the ΔK vs, da/dN curves were also obtained. Finally, the crack propagation paths were observed by optical microscope.