Al-Si闭孔泡沫铝材料的压缩行为

对熔体转移发泡法制备的不同密度Al-Si闭孔泡沫铝材料进行了准静态压缩实验,研究了Al-Si闭孔泡沫铝材料的准静态压缩力学行为及变形机制,并从微观上分析了相对密度对Al-Si闭孔泡沫铝材料的力学性能影响.结果表明,Al-Si闭孔泡沫铝材料的压缩过程具有明显的脆性材料压缩变形特征,即经历三个阶段线弹性阶段、脆性崩溃阶段、致密化阶段.相对密度对Al-Si闭孔泡沫铝材料的力学性能影响显著,随着相对密度的增加,压缩强度和弹性模量逐渐增大,且理论结果与试验结果比较吻合.

Effect of Relative Density on Compressibility of Al-Si Closed-Cell Aluminum Foam

A quasi-static compression test was carried out for Al-Si closed-cell aluminum foam of different relative densities,which was prepared by melt transferring-foaming process. The quasi-static mechanic behavior or deformation mechanism of the tested material due to compression was studied. The effect of relative density on the compressibility of Al-Si closed-cell aluminum foam was analyzed microscopically. The results show that the process of Al-Si closed-cell aluminum foam under compression presents obviously the characteristics of compressive deformation of brittle materials,i.e.,a process from linear elasticity to friable collapse and finally to densification. The mechanic properties of Al-Si closed-cell aluminum foam is affected obviously by its relative density. Its compressive strength and Young's modulus both increase with increasing relative density. All these from test conform well with the results calculated theoretically.