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A356 합금의 발포 특성 및 기계적 성질에 미치는 점증제의 영향
탁병수 ( Byeong Su Tak ),김병구 ( Byeong Gu Kim ),정승룡 ( Seung Reung Jeong ),허보영 ( Bo Young Hur ) 한국주조공학회 2010 한국주조공학회지 Vol.30 No.6
The viscosity of foam metal is necessary to get the pores, but it is difficult to manufacture net-shape foam, because the fluidity decreases by increasing viscosity. In this study, the A356 alloy which has good fluidity and less defect was selected and fabricated to foam metal. To understand about effect of thickening agent on foaming and mechanical properties, quantity of thickening agent was changed. The pore size, porosity and distribution of foam metal were measured by i-solution program. And compression test were performed by UTM. In case of 3.0wt% Ca in thickening agent, it is found that most of foam consist of homogeneous shape, and the growth height had the highest value of 204 mm in the all fabricated foams. The porosity was 93% and compressive strength was 3.1 MPa. In the microstructure, the Al2Si2Ca intermetallic compound and Ti were observed. The vickers hardness value rose with increasing viscosity value.
AM50 Mg합금 발포금속의 제조와 지르코늄 첨가 영향
김병구 ( Byeong Gu Kim ),탁병수 ( Byeong Su Tak ),허보영 ( Bo Young Hur ) 한국주조공학회 2010 한국주조공학회지 Vol.30 No.6
Foamed metal has become an attractive material, which has unique physical, thermal, acoustic, damping and mechanical properties, because large amount of pores are distributed in the metal matrix. Therefore, metal foam can be used for the light weight application in automotive, locomotive, aerospace fields. Aluminum foams have been developed successfully and will be employed in the next generation of energy absorption boxes. Magnesium alloys are most eligible candidate to substitute aluminum alloy, especially for lower density and higher damping properties in wide industrial fields. Magnesium alloy foams are expected to be particularly advantageous due to two thirds the density of aluminum. However, foaming magnesium have been weakness of high activity, difficult processing and very dangerous. In order to upgrade this problem, AM50 magnesium alloy which has better characteristic is safe to use through foaming time and alloying element in this study.