摘要
针对添加了Y和Sr元素双辊连铸连轧(TRC)AZ31镁合金板材气胀成形过程中空洞形成进行了研究,采用了双辊连铸连轧工艺制备出1 mm厚的AZ31和AZ31+Y+Sr板材,并进行了气胀成形实验.通过宏观测量与金相观察对胀形件进行分析,结果表明:连铸连轧工艺能够有效细化晶粒,在同等温度条件下,添加了Y和Sr元素的AZ31板材其超塑性能比普通双辊连铸连轧AZ31板材有显著提高;胀形件顶部比球面的空洞尺寸大、数量多,空洞的形成经过了形核、长大和聚合三个阶段,最终导致材料的断裂.
This paper studies the cavities characteristics of the twin roll casting（TRC）AZ31 alloy sheets with Y and Sr elements added during the gas bulging forming process.The 1mm sheets in the experiment was made by twin roll casting process.At the same time,we carried out gas bulging test on the AZ31 sheet.We concluded through macromeasure and metallographic observation of the samples： at the same temperature,the superplastic ability of the twin roll casting AZ31 magnesium alloy sheets with Y and Sr elements added has improved significantly compared to the common twin roll casting AZ31 sheets.On the top of the samples,the size and the amount of the cavities were lager than those on the sphere,and the cavities passed through start,growth and aggregation three stages,which eventually led to the fracture of materials.
出处
《哈尔滨理工大学学报》
CAS
2012年第5期9-12,共4页
Journal of Harbin University of Science and Technology
基金
高等学校博士学科点专项科研基金(20102303110004)
