铸造铝铜合金微观孔洞三维特征的研究  

Study of Three Dimensional Characteristics of Micropores in Al-Cu Alloys

作　　者：骆文锋 赵海东[1] 彭嘉林[1] 邹纯[1] 

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心,广东广州510640

出　　处：《铸造》2016年第1期13-17,共5页Foundry

基　　金：广东省省部产学研结合项目(2012A090300016);广东省省级科技计划项目(2013B090600118)

摘　　要：采用三维X射线断层扫描与重构技术分析铸造Al-4.5wt.%Cu和Al-15wt.%Cu合金的微观孔洞,研究了合金凝固方式与冷却速率对微观孔洞三维特征的影响。结果表明,结晶温度范围大、糊状倾向较大的Al-4.5wt.%Cu合金,微观孔洞弥散分布、数量少、平均体积大而圆整度较小,且孔洞三维特征参数与冷却速率存在线性关系;而结晶温度范围小的Al-15wt.%Cu合金,孔洞主要分布在铸件上部,数量多、平均体积小而圆整度较大,其特征参数与冷却速率并不存在明显关系。The micropores in A1-4.5wt.%Cu and Al-15wt.%Cu were inspected and analyzed by 3D X-Ray tomography and reconstruction technology. The effects of alloy solidification temperature range and cooling rate on the micropore three dimensional characteristics were analyzed. The result indicates that the micropores in A1-4.5wt.% Cu alloy with large solidification temperature range and mushy zone are characterized with distribution in more parts, large average volume and small sphericity, and the parameters ofmicropores have linear relation with cooling rates; while those in A1-15wt.%Cu alloys with small solidification temperature range are mainly located at the casting upper part and have smaller average volume and larger sphericity compared to the former alloy, and the parameters does not show direct dependence on cooling rates.

关 键 词：铝铜合金 微观孔洞 三维X射线断层扫描 冷却速率 

分 类 号：TG292[金属学及工艺—铸造]