熔体热历史对Al-Cu合金熔体结构的影响  

Influence of Melt Thermal History on Structure of Melt Al-Cu Alloy

作　　者：司乃潮[1] 赵罗根[1] 孙克庆[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《有色金属》2008年第4期22-25,共4页Nonferrous Metals

基　　金：江苏大学"科技创新团队"资助项目(JD200609)

摘　　要：提出包含几种不同性质微观不均匀区的Al-Cu合金熔体物理模型,认为合金熔体中同时存在着不可逆类固型原子团簇、可逆类固型原子团簇、可逆类液型原子团簇的不均匀现象。有效地解释了熔体热历史对Al-Cu合金熔体结构影响的内在机制,以及长期以来不易理解的熔体过热处理使熔体结构状态发生不可逆变化即熔体的粘滞系数η和溶质扩散系数DL出现滞后效应以及形核过冷度ΔT-增加的现象。The physical models of the Al-Cu alloy melts with different properties in microheterogeneous region are established. It is found that the heterogeneous phenomenon of irreversible solid atomic clusters, reversible solid atomic clusters and reversible liquid atomic clusters may be present simultaneously in the alloy melts. The effect mechanism of thermal history of the melt on the melt structure of Al-Cu alloys and the phenomenon that the melt overheating treatment makes the melt structure irreversible, namely the lag effect of viscosity of melt η and the solute diffusion coefficient DL and the increasing of nucleation undercooling △T are described.

关 键 词：金属材料 Al—Cu合金 熔体热历史 微观不均匀区 形核过冷度 不可逆变化 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG111.4[金属学及工艺—金属材料]