含钪Al-Cu-Li-Zr合金的组织与性能  

Microstructure and properties of Al-Cu-Li-Zr alloys containing Sc

作　　者：梁文杰[1] 潘青林[1] 朱朝明[1] 何运斌[1] 刘元斐[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料科学与工艺》2007年第2期154-157,共4页Materials Science and Technology

基　　金：国家高技术研究发展计划新材料领域资助项目(2002AA305104)

摘　　要：为了研究微量Sc对Al-3．5Cu-1．5Li-0．12Zr合金组织与性能的影响，采用铸锭冶金法，制备了4种不同Se含量的Al-3．5Cu-1．5Li-0．12Zr合金．采用室温拉伸力学性能实验、金相显微镜和透射电镜研究了微量Sc对Al-3．5Cu-1．5Li-0．12Zr合金微观组织和拉伸性能的影响．结果表明：添加0．1％Sc能消除铸态合金的枝晶组织，有效地抑制了再结晶的发生，具有一定的强化作用和明显的增塑效应；添加0．15％Sc和0．25％Sc能显著细化合金铸态的晶粒组织，但添加0．15％Sc不能抑制合金固溶过程中再结晶；添加0．25％Sc会促进合金固溶过程中的再结晶，从而降低合金的强度．合金中较适宜的Sc加入量为0．10％～0．15％，此时合金既具有较高的强度，又兼具较好的塑性．In order to investigate the effect of minor Sc additions on microstructure and tensile properties of Al -3.5Cu - 1.5Li -0. 12Zr alloy, four kinds of Al -3.5Cu - 1.5Li -0. 12Zr alloys containing different percents of Sc were prepared using ingot metallurgy processing. The effect of minor Sc additions on microstructure and tensile properties of Al -3.5Cu - 1.5Li -0. 12Zr alloy has been investigated by using TEM, OM and tensile test at room terr erature. The results show that addition of 0. 10% Sc can improve the strength and elongation, eliminate the dendrite of the alloy, strongly restrain recrystallization in the process of solid solution treatment, and addition of 0. 15% Sc and 0. 25% Sc cause obvious grain refinement. But addition of 0. 15% Sc can not restrain recrystallization in the process of solid solution treatment, and addition 0. 25% Sc can increase recrystallization in the process of solid solution treatment, reduce the strength of the alloy. The favorable addition of Sc is 0. 10% -0. 15% in these alloys.

关 键 词：含Sc的Al-Cu-Li-Zr合金 显微组织 AL3SC 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]