MICROSTRUCTURE AND PROPERTIES OF Al₂O₃ sf／Al－1．5Mg COMPOSTITE MANUFACTURED BY EXTRUSION DIRECTLY FOLLOWING LIQUID INFILTRATION

来源期刊：中国有色金属学报(英文版)1995年第4期

论文作者：Hu Lianxi Luo Shoujing Huo Wencan Wang Zhongren

文章页码：146 - 150

Key words：Al₂O₃sf/Al-1.5Mg composite； microstructure； properties； extrusion； infiltration

Abstract: The microstructure and properties of short alumina fiber reinforced Al-1.5Mg composite(Al₂O₃sf/Al-1.5Mg) manufactured by extrusion directly following liquid infiltration (EDFLI) were experimentally investigated.It was found that the microstructure of Al₂O₃sf/Al-1.5Mg composite is characterized by a well-densified matrix,with fine recrystallized grains and free from microvoids and non-wetting defects,and quite uniformly and quasi unidirectionally distributed fibers maintaining adequate aspect ratios,which leads to a better strengthening effect.It was also found that the mechanical properties E,σ_0.2,σ_b and the thermal expansion resistance of the composite simultaneously increase with the enhancement of the fiber volume fraction while the elongation δ is still maintained at a relative high level.Besides,the Al₂O₃sf/Al-1.5Mg composite possesses corrosion resistance equivalent to that of the Al-1.5Mg alloy.