纳米Al/Al_2O_3复合材料的热稳定性机理  

MECHANISM OF THERMAL STABILITY FOR A1/A1_2O_3 NANO-COMPOSITE

作　　者：杨志卿[1] 陈 吉[1] 贺连龙[1] 吴 波[1] 范学书[1] 丛洪涛[1] 叶恒强[1] 

机构地区：[1]中国科学院金属研究所

出　　处：《材料研究学报》2002年第4期361-364,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金资助项目50171068;59971055

摘　　要：通过对纳米Al/Al2O3复合材料微观结构的研究,揭示了这种材料热稳定性的特点.在550℃以下,完整的A12O3的外壳限制了A1的传输,从而保持了原来的晶粒形态和尺寸.在570～650℃的温度范围内,弥散分布的Al2O3碎片通过钉扎晶界抑制了Al晶粒的长大.即使在660℃,A1晶粒熔化后,弥散的A12O3碎片仍可在冷凝过程中有效地抑制Al晶粒的长大.The microstructure of the Al/Al2O3 composite was investigated to reveal the thermal stability. The Al2O3 shells remained perfect below 550°C, which limited grain growth of Al and improved thermal stability of this material. In the temperature range from 570 to 650°C, the randomly distributed Al2O3 fragments prevented the Al grains from growing up by pinning Al grain boundaries. The Al2O3 fragments randomly distributed could limit the gain growth of Al efficiently during the process of solidification of melted Al.

关 键 词：纳米复合材料 AL/AL2O3 热稳定性 铝 氧化铝 

分 类 号：TB333[一般工业技术—材料科学与工程]