形变对铁铜合金时效析出的影响  

Influence of thermo-mechanical processing on aging precipitation of Fe-Cu alloys

作　　者：李闯[1] 王学敏[1] 尚成嘉[1] 郑长安[1] 刘学一[2] 贺信莱[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]首钢(集团)公司技术研究院,北京100041

出　　处：《北京科技大学学报》2008年第12期1353-1357,1373,共6页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50471089)

摘　　要：对铁铜合金分别进行50%和80%冷变形,利用金相显微镜以及高分辨投射电镜研究形变热处理过程中的微观组织与沉淀析出,分析形变量对时效析出的影响.结果表明:变形有助于第二相的析出,大的冷变形量时沉淀相粒子形成的速率更快,所占体积分数更大.优先析出为富铜过渡相,这种富铜过渡相所形成的GP区对合金起强化作用,其后随时效时间延长这种富铜相逐渐转转变成ε-Cu.The aging precipitation of a Fe-Cu alloy cold-deformed 50 % and 80 % was studied. Optical microscope and HREM were employed to observe the microstructure and precipitation in thermo-mechanical processing, and the effect of cold deformation on the aging precipitation was analyzed. The results show that cold deformation is helpful to the precipitation of second phase, after a large quantity of cold deformation the precipitation is accelerated and the bulk volume of second phase becomes greater. Copper-rich transition phase is precipitated in advance and then transformed to ε-Cu phase with the increase of time during the overaging period. The copper-rich phase, i.e. GP zone, is the main cause to strengthen the alloy.

关 键 词：铁铜合金 时效 形变热处理 析出 GP区 

分 类 号：TG142.1[一般工业技术—材料科学与工程]