( 东南大学 材料科学与工程系，南京 210096)
摘 要: 采用金属管道氩载气流中的程序升温分解装置获得了氢化钛的热分解特性；运用位移传感器计算机系统获得了铝合金熔体保温泡沫化过程中孔隙率与保温发泡时间的关系；用图像分析法研究了氢化钛在铝合金熔体中均匀分散时间对泡沫铝合金熔体孔结构的影响；研究了不同孔隙率泡沫铝合金的压缩力学性能。结果表明：在940 K时，发泡剂氢化钛分解的30～80 s内，随着均匀分散时间的延长，铝合金熔体泡沫的孔隙率保持恒定，但孔数增多，孔径变小，由此获得了制备高比刚度、小孔径和低孔隙率泡沫铝合金的新途径。
关键字: 高比刚度；小孔径；低孔隙率；泡沫铝合金；氢化钛热分解；界面推移
and small pore diameter
（ Department of Materials Science and Engineering,
Southeast University, Nanjing 210096, China）
Abstract: Thermal decomposition properties of titanium hydride are acquired by temperature programmed decomposition (TPD) apparatus with metal tube structure, in which Ar is used as a carrier gas. The relationships between the porosity of Al alloy melt foam and foaming time at 940 K are gained by displacement sensor-computer system. Pore structures of Al alloy melt foam with different stirring time of titanium hydride in the Al alloy melt are studied by image analysis method. The compressive properties of the Al alloy foam are studied. The results show that at 940 K and during the stirring time period of 30~80 s, the porosity of the Al alloy melt foam is kept constant while the pore number increases and pore diameter decreases, which is a new method to fabricate Al alloy foam with high specific stiffness, low porosity and small pore diameter.
Key words: high specific stiffness；small pore diameter；low porosity；Al alloy foam；thermal decomposition of titanium hydride；interface displacement
