铝－锂合金中δ’（Al＿3Li）沉淀相时效粗化行为及体积分数的测定  

Coarsening Behavior of(Al_3Li)Precipitates and Measurement of Volume Fraction in Binary Al-Li Alloys

作　　者：袁庆龙[1] Davi.,CK 

机构地区：[1]山西矿业学院

出　　处：《电子显微学报》1995年第4期297-302,共6页Journal of Chinese Electron Microscopy Society

摘　　要：对经固溶处理的二种Ａｌ－Ｌｉ合金（１．９４ｗｔ．％Ｌｉ和２．７５ｗｔ．％Ｌｉ）的时效过程进行了研究。结果表明：δ’的生长速率遵从Ｏｓｔｗａｒｄ粗化动力学。１．９４ｗｔ．％Ｌｉ合金δ’产生于时效过程中，而２．７５ｗｔ．％Ｌｉ合金的δ’产生于时效的前期阶段。前者的表现体积分数明显大于根据相图估算的数伍，真实体积分数则与此值接近；后者的体积分数低于根据相图估算的数值，这可能归咎于δ’固相线的位置、统计学误差及Ｌｉ更易在时效过程中贫化。Aging processes of two binary Al-Li alloys have been investigated containing 1.94wt.%Li and 2.75wt.%Li after solution-treated.The results show that coarsening of δ’was found to obey Ostward ripening kinetics.δ’of 1.94wt.%Li alloy occurs during aging process and that of 2.75wt.%Li alloy occured prior to aging process.The apparent volume fraction of 1.94wt.%Li alloy is appreciably larger than that estimated from phase dia-gram,but its true volume fraction is approximate to this value.The apparent volume fraction of 2.75wt.%Li alloy is lower than that got from phase diagram.This may attribute to the position of δ’solidus,statistics errors and the easier depletion of Li during aging process.

关 键 词：沉淀相 时效 表观体积分数 铝锂合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]