Al基和Al-6Si基闭孔泡沫铝的动态压缩性能  

Dynamic compressive property of closed-cell aluminum foam with Al matrix and Al-6Si matrix

作　　者：尉海军[1] 李兵[1] 郭志强[1] 姚广春[1] 

机构地区：[1]东北大学材料与冶金学院教育部材料先进制备技术工程研究中心,沈阳110004

出　　处：《中国有色金属学报》2007年第5期704-709,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2002AA334060)

摘　　要：利用熔体转移发泡法制备了不同密度的Al基和Al-6Si基闭孔泡沫铝(CCAF),探讨了CCAF基体的微观形貌及物相组成,对其动态压缩性能进行了研究。结果表明:Al基CCAF基体微观形貌较单一,基本上是小块状(Al20CaTi2);而Al-6Si基CCAF基体微观形貌复杂,主要呈大片状(Al3.21Si0.47和CaAl2Si3)、长针状(Al3Ti)和小白点(Al2O3)。动态压缩结果显示:Al基CCAF压缩应力—应变曲线较平缓,断裂层有明显的材料撕裂痕迹;而Al-6Si基CCAF压缩应力—应变曲线不光滑,个别曲线波动较大,断裂层出现显著的脆性材料断裂特征;随着相对密度的增加,Al基和Al-6Si基CCAF屈服强度(σpl)和表观弹性模量(E0.2)整体趋势都在增加。Closed-cell aluminum foam （CCAF） with Al matrix and Al-6Si matrix was prepared by method of molten body transitional foaming process, the metallography of matrix was discussed, and its dynamic compressive property was researched. The results show that the metallography of CCAF with A1 matrix is simple, basically existing as small pieces （Al20CaTi2）, whereas the metallography of CCAF with Al-6Si matrix is complex, mainly existing as big pieces （Al3.21Si0.47 and CaAl2Si3）, long needles （Al3Ti） and small white flakes （Al2O3）. Dynamic compressive results display that the stress--strain curves of CCAF with Al matrix are smooth, the zone of fractures has obvious teared trace, whereas the stress--strain curves of CCAF with Al-6Si matrix are not smooth, certain curve fluctuates markedly, and zone of fracture indicates obvious fracture characteristic of brittle materials. With increasing relative density, the whole trend of yield strength （σp1） and apparent elastic modulus （E0.2） also increases.

关 键 词：闭孔泡沫铝 动态压缩 相对密度 屈服强度 表观弹性模量 

分 类 号：TG146.21[一般工业技术—材料科学与工程]