AM50镁合金真空压铸件孔洞分布与力学性能的关系  

Relationship Between Porosity Distribution and Mechanical Properties of Vacuum Die Casting AM50 Magnesium Alloy

作　　者：胡泊[1] 熊守美[1] 村上正幸[2] 松本悦豪[2] 池田伸吾[2] 

机构地区：[1]清华大学先进成形制造重点实验室,清华大学机械工程系,北京100084 [2]日本东洋机械金属株式会社

出　　处：《铸造》2009年第11期1115-1118,1122,共5页Foundry

基　　金：国家自然科学基金(50475016);国家重点基础研究发展规划项目(2006CB605208-2)

摘　　要：孔洞缺陷是压铸件力学性能预测中的重要因素。工艺条件在影响金属液充型凝固过程的同时,也对压铸件内部的孔洞尺寸、孔洞数量及分布情况产生影响,并导致力学性能变化。研究压铸件内部孔洞分布的特征及其对力学性能的影响规律,有助于理解压铸件组织和性能的内在联系,亦对研究真空压铸以及常规压铸工艺参数对压铸件力学性能的影响规律有所帮助。结合镁合金压铸件的缺陷带理论,应用超声扫描显微镜采集孔洞缺陷数据,对AM50镁合金真空压铸阶梯试样的孔洞分布进行统计分析,通过孔洞分布特征确定缺陷带的深度位置,研究缺陷带附近的孔隙率与压铸件力学性能的关系。Porosity is an important factor in predicting the mechanical properties of die castings. Process conditions not only influence mould filling and solidification process, but also influence the size and quantities of porosities of castings as well as the mechanical properties. Study on porosity distribution as well as influences of porosity on mechanical properties is important in understanding the relationship among process parameter, mechanical property and microstructure. In this paper, the porosity distribution data of high vacuum die cast AM50 alloy were captured using a scanning acoustic microscope and statistical analysis was made to the porosity distribution of specimens with different thickness from a step shape casting. The defect band position within the casting was determined according to the porosity distribution characteristics and the relationship between the porosity ratio at defect band and mechanical properties was studied.

关 键 词：真空压铸 镁合金 孔洞分布 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]