摘要
利用NaCl颗粒作为预制型,采用渗流铸造方法制备了AZ91泡沫合金,样品孔隙之间具有良好的连通性。泡沫密度为0.724g/cm3,孔隙率为0.602。压缩试验结果表明,AZ91镁合金泡沫材料的塑性变形能力明显高于铸态AZ91镁合金。在孔隙被压合的过程中,泡沫材料在低应力条件下发生剪切破坏。这一变形机制在金属泡沫材料中尚未见到报道。
The AZ91 magnesium alloy foam with a diameter of 9mm was fabricated by using vacuum melt infiltration and water quenching methods. NaCI salt was used as a placeholder in this investigation. The porosity and density were 0.602 and 0.724 g/cm^3 respectively for the AZ91 magnesium foam. The pores were evenly distributed in the material. The plastic strain during compression for the AZ91 magnesium alloy foam is much higher than that of the as-cast AZ91 magnesium alloy fabricated by the same process. The fracture event occurred at low stress during the pores vanishing. Which is the first evidence observed in metal foam materials during compression according to our knowledge.
出处
《铸造》
EI
CAS
CSCD
北大核心
2007年第3期242-244,共3页
Foundry
关键词
渗流铸造
AZ91镁合金泡沫
破坏机制
melt infiltration
AZ91 magnesium alloy foam
fracture mechanism
