| 학회 | 한국재료학회 |
| 학술대회 | 2006년 가을 (11/03 ~ 11/03, 수원대학교) |
| 권호 | 12권 2호 |
| 발표분야 | 에너지 환경재료 |
| 제목 | Fabrication and characteristic of Mg alloy foams |
| 초록 | Metal foam is a kind of attractive material, which has combination of light weight, good energy absorption capacity, and good thermal, acoustic, mechanical, electrical properties. Metal foam can be fabricated by a variety of methods. Among them, melt foaming method is especially attractive due to its relative low cost. Mg alloy foam is expected to be advantageous due to low density of their metal matrix, which is approximately two thirds of aluminum. Mg alloy foams with closed cell structure were fabricated successfully by using melt foaming method with addition of calcium carbonate powder as blowing agent. In this study, the AM60 (MgAl6)and AZ91(MgAl9Zn1) Mg alloys were chosen as metal matrix and the fabrication process can be divided into five steps, which is that (1) Melting: a definite quantity of Mg alloy is melted in a crucible; (2) Thickening: Ca particle is used as adjuster to increase the melt viscosity to a proper level; (3) Stirring: the blowing agent is added into the melt by vigorous stirring; (4) Holding: the foamed melt is held in the furnace until a certain cellular structure foamed; (5) Cooling: the melt foam is removed out of the furnace and cooled. Then the Mg alloy foam can be obtained. The pore structures (porosity, pore size, etc.) of Mg alloy foams were obtained by analyzing their corresponding section images. The results show that porosity will rise and pore size will increase with increasing the foaming temperature. Further more, the AZ91 alloy can be easily foamed into metal foam with relative high porosity and big pore size at the same fabrication condition while AM60 can be foamed into relative high porosity with small pore size. |
| 저자 | YANG Dong-Hui1, 서창환2, 허보영1 |
| 소속 | 1KㅡMEM R&D Cluster, 2경상대 |
| 키워드 | Mg alloy foam; Melt foaming method; Calcium carbonate; Pore structures |
