过时效工艺对AA2195铝锂合金微观组织的影响

材料热处理学报, 2006, 27(6): 52-56. doi: 10.3969/j.issn.1009-6264.2006.06.013

过时效工艺对AA2195铝锂合金微观组织的影响

杜予晅 ^1, , 张新明 ^2, , 叶凌英 ^3, , 罗智辉 ^4,

1.中南大学材料科学与工程学院,湖南,长沙,410083

2.中南大学材料科学与工程学院,湖南,长沙,410083

3.中南大学材料科学与工程学院,湖南,长沙,410083

4.中南大学材料科学与工程学院,湖南,长沙,410083

基金项目: 高性能铝材与铝资源高效利用的基础研究项目(2005CB623706)

关键词：铝锂合金 , 过时效 , 超塑性 , 再结晶

Influence of over-aging technology on microstructure of AA2195 Al-Li alloy

采用扫描电子显微技术(SEM)、透射电子显微技术(TEM)、背反射电子衍射技术(EBSD)等分析手段对AA2195铝锂合金过时效对析出相粒子组态、细晶组织的影响进行了研究.结果表明:时效过程中析出的球状粒子为富Cu相,板条状相为富CuFe相;在相同的时效时间下,越高的处理温度可以得到更大的析出相粒子体积分数;在600 K以下时效时,粒子沿原始晶界呈连续分布,并几乎占满所有晶界,这种网状分布的粒子在最终快速退火中不仅无法提供足够的形核位置,还将成为大角度晶界移动的障碍,导致大尺寸扁平状晶粒组织的形成,而600 K以上的样品则可以得到球状粒子,晶界上无连续分布的粒子,得到了比较理想的晶粒组织.600 K/24 h炉冷是AA2195铝锂合金超塑性预处理的最佳时效工艺.

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