藕状多孔纯Cu及多孔Cu-1.8%Cr合金铸件的研究  

Study on the Lotus-Type Porous Cu and Porous Cu-1.8%Cr Alloy

作　　者：黄洲[1] 宋群玲[1] 金青林[1] 杨天武[1] 李再久[1] 蒋业华[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《铸造》2014年第6期583-586,590,共5页Foundry

摘　　要：利用自行开发的GASAR装置,成功制备出藕状多孔纯Cu及多孔Cu-1.8%Cr合金试样,并对其孔隙率、平均气孔直径、基体组织及压缩特性进行了相应的对比研究。结果表明:随着凝固高度的增加,气孔率保持不变,而平均气孔直径增大,且多孔Cu-1.8%Cr合金的气孔率和平均气孔直径高于多孔纯Cu;藕状多孔纯Cu的定向凝固组织是由粗大的Cu晶粒组成,而多孔Cu-1.8%Cr合金的定向凝固组织为白色细小的α固溶体、灰色的共晶相(α+β)以及少量颗粒状的单相Cr质点组成;藕状多孔纯Cu及多孔Cu-1.8%Cr合金的压缩应力-应变曲线均由弹性变形阶段、屈服平台阶段及密实化阶段组成,但是Cr的加入使得藕状多孔纯Cu的压缩性能得到较大提高——杨氏模量和屈服强度增加而加工硬化指数降低。Lotus-type porous Cu and Cu-1.8%Cr alloys castings were fabricated by the self-developed GASAR device,and compared with porosities,average pore diameter,microstructure and compressive properties.The results show that the solidification height has no influence on the porosity,but the average pore diameter increases with the increase of solidification height,and the porosity and average pore diameter of lotus-type porous Cu-1.8%Cr alloy are higher than that of Cu; lotus-type porous Cu is composed of thick Cu grain,and porous Cu-1.8% Cr alloys is composed of the α solid solution of tiny white,gray eutectic phase （α ＋ β） and a small amount of granular single-phase Cr particles; The compressive stress-train curves of the porous Cu and Cu-1.8%Cr alloy consisted of linear elastic stage,plateau stage and densification stage.The addition of Cr can effectively increase the compressive properties of porous Cu,which characterized by the increase of the young＇s modulus and the yield strength,and decrease of the strain hardening index.

关 键 词：藕状多孔Cu-Cr合金 孔隙率 气孔直径 压缩性能 

分 类 号：TG291[金属学及工艺—铸造]