轧制态下Cu含量对泡沫铝泡孔结构的影响  

Effect of Cu Content on Pore Structure of Aluminum Foams After Rolling Process

作　　者：魏宥 罗洪杰 卢晓通[1] 杨世杰 WEI You;LUO Hong-jie;LU Xiao-tong;YANG Shi-jie(School of Metallurgy,Northeastern University,Shenyang 110819,China;Engineering Technology Research Center of Ministry of Education for Materials Advanced Preparation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]教育部材料先进制备技术工程研究中心,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2021年第10期1421-1426,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51874093).

摘　　要：采用液相复合-轧制技术制备不同w_(Cu)的可发泡预制坯及闭孔泡沫铝材,研究了w_(Cu)对泡沫铝泡孔结构的影响.结果表明:随着w Cu的增加,泡孔结构的均匀性增加,孔径减小,泡孔合并产生的大泡孔数量减少,但泡沫体的塌缩和老化特征增强.对比不同w_(Cu)的预制坯的膨胀曲线,随着w_(Cu)的增加,预制坯的最大膨胀率先增大后减小,且达到最大膨胀率的发泡时间明显减少.微观结构分析表明:在AlSi_(9)合金中加入Cu,生成了CuAl_(2)O_(4)和CuAl_(2),CuAl_(2)O_(4)提高熔体的黏度,减小了重力排液及毛细作用的影响,提高了泡沫的稳定性.CuAl_(2)先于AlSi_(9)熔化,在晶界上形成熔池,气泡提前形核长大,使发泡过程提前完成.The liquid phase composite-rolling technology is used to prepare foamable preforms with different content of W_(cu) and closed-pore aluminum foams.The effect of W_(cu) on the pore structure of the aluminum foams was studied.The results show that with the increase of Wcu,the uniformity of the pore structure increases,and the pore size and the number of large pores produced by pore merging decrease,while the collapsing and aging characteristics of the foam are enhanced.After comparing the expansion curves of preforms with different W_(cu),it is found that when the W_(cu) increases,the maximum expansion rate of the preform firstly increases and then decreases and the foaming time to reach the maximum expansion rate is greatly shortened.The microstructure analysis shows that CuAl_(2)O_(4) and CuAl_(2) can be formed after adding Cu into AlSi_(9)alloy.CuAl_(2)O_(4) increases the viscosity of the melt,reduces the effect of gravity drainage and capillary action,and improves the stability of the foam.CuAl_(2) melts prior to AlSi_(9)alloy,forming a molten pool on the grain boundary,and the bubbles nucleate and grow in advance,so that the foaming process is completed ahead of schedule.

关 键 词：泡沫铝 液相复合-轧制技术 CU含量 泡孔结构 膨胀率 

分 类 号：TG146.2[一般工业技术—材料科学与工程]