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윤옥남,김두훈,최현 한국주조공학회 1999 한국주조공학회지 Vol.19 No.4
Porous metal has been highlighted as a new material on the compound effect of mechanical, thermal, and noise properties. Therefore, various methods for producing porous aluminum by foaming technique have been developed. Foaming condition is divided into three parts-thickening, foaming, and cooling process. Process for thickening is consist of calcium addition and proper stirring. Stirring treatment is to disperse oxide films into the melt and is to help homogeneous gas distribution by smoothing mix of forming agent. Only the combination of more than 0.5 wt% Ca and the stirring condition (600 rpm, 10 min) reduces the stirring velocity 80rpm approximately. Foaming process is consist of TiH₂ addition and stirring. The porous metal with specific gravity of 0.4∼0.5g/㎤ can be produced with the condition of 1.5-2.0wt% TiH₂ and stirring time for 1200 rpm, 30 sec. This paper deals with the appropriate condition of foaming process for producing the porous aluminum. (Received February 27, 1999)
자동차 차체용 알루미늄 합금 판재의 기계적특성과 부식피로수명
박인덕(In-Duck Park),윤옥남(Ok-Nam Yoon),남기우(Ki-Woo Nam) 한국해양공학회 1997 韓國海洋工學會誌 Vol.11 No.2
The objective of this study is to compare the mechanical properties of 6000 series Al-Mg-Si aluminum alloy (AC120) with 5000 series Al-Mg aluminum alloy (TG25), and to investigate the influence of corrosion solution for fatigue life.<br/> Comparing of TG25 and AC120 alloy sheets, TG25 alloy sheets showing higher plastic strain ratio and total elongation have better formability than AC120 alloy sheets. The hardness of nugget area was a little higher than that of base metal area and the columnar structure and dendritic structure was observed in nugget area. Also, grain coarsening was observed in HAZ(Heat Affected Zone). In a corrosion fatigue experiment, the fatigue life decreased as concentration increased, when a dipping time was constant. The fatigue life decreased as dipping time increased, when a concentration was constant.