高能激光束引燃自蔓延合成共晶Al/Cu合金组织结构及性能  

Microstructure and property of eutectic Al/Cu alloys synthesized by laser-induced self-propagating high-temperature synthesis

作　　者：李刚[1] 水东莉[1] 唐海鹏[1] 陈永君[1] 刘丽[1] 侯俊英[1] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,阜新123000

出　　处：《核技术》2011年第1期41-45,共5页Nuclear Techniques

基　　金：辽宁省教育厅科技研究项目(2008297)资助

摘　　要：针对共晶Al/Cu系粉末压坯,采用激光引燃自蔓延烧结技术(SHS)制备烧结Al/Cu合金,用扫描电镜(SEM)、金相显微镜(OM)、X射线衍射(XRD)以及布氏硬度计研究了压制压力和激光功率与作用时间对烧结合金微观结构、致密性及硬度的影响。研究结果表明,随着激光功率提高和作用时间延长,烧结合金组织均匀性得到提高,相对密度增加,当原始压坯相对密度为85%时,烧结密度最高为3.11 g/cm3;烧结合金的硬度值在合金中部区达到最高,最高值为131 HB。并提出通过测量二次枝晶臂间距,估算该位置的烧结冷却速度。In this work,eutectic Al/Cu powder was used to prepare Al/Cu alloys by SHS-sintering（laser-induced self-propagating high-temperature synthesis）.Influences of the pressing pressure,laser power and sintering time on microstructure of the sintering alloys,densification and hardness were studied by SEM,OM,XRD and Brinell′s Hardness Tester.It was found that uniformity and relative density of the sintering alloy increased with the laser power and sintering time.When the relative density of the original compacts was 85%,the sintered density could be up to 3.11 g/cm^3;the highest hardness of sintered alloy was 131HB and this was at the central area.In order to estimate the sintering cooling rate of the location,the measure of secondary dendrite arm spacing is proposed.

关 键 词：激光引燃 微观结构 致密性 硬度 二次枝晶臂间距 

分 类 号：TG156.99[金属学及工艺—热处理]