( 東南大學 材料科學與工程系，南京 210096)
摘 要: 采用金屬管道氬載氣流中的程序升溫分解裝置獲得了氫化鈦的熱分解特性；運用位移傳感器計算機系統(tǒng)獲得了鋁合金熔體保溫泡沫化過程中孔隙率與保溫發(fā)泡時間的關系；用圖像分析法研究了氫化鈦在鋁合金熔體中均勻分散時間對泡沫鋁合金熔體孔結(jié)構(gòu)的影響；研究了不同孔隙率泡沫鋁合金的壓縮力學性能。結(jié)果表明：在940 K時，發(fā)泡劑氫化鈦分解的30～80 s內(nèi)，隨著均勻分散時間的延長，鋁合金熔體泡沫的孔隙率保持恒定，但孔數(shù)增多，孔徑變小，由此獲得了制備高比剛度、小孔徑和低孔隙率泡沫鋁合金的新途徑。
關鍵字: 高比剛度；小孔徑；低孔隙率；泡沫鋁合金；氫化鈦熱分解；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
