激光快速熔凝Zn-2%Cu包晶合金的显微组织  

MICROSTRUCTURE OF Zn-2%Cu ALLOY UNDER LASER RAPID MELTING-SOLIDIFICATION

作　　者：苏云鹏[1] 王猛 林鑫[1] 李华琳[1] 黄卫东[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,西安710072

出　　处：《金属学报》2005年第1期67-72,共6页Acta Metallurgica Sinica

基　　金：国家杰出青年基金项目59825108国家自然科学基金项目50201012和50071048资助~~

摘　　要：利用5 kW连续波CO2激光器对Zn-2％Cu包晶合金进行了表面快速熔凝实验研究,扫描速率从6 mm/s至1207mm/s.随着凝固速率的提高,该合金微观组织形态由低速平界面向层片状组织、浅胞晶直至高速绝对稳定平界面转变.实验结果表明,该合金微观组织演化规律与利用林鑫等的数值模型和Jackson-Hunt的共晶模型相结合所得到的界面响应函数作出的预测结果吻合较好.Laser surface remelting experiments have been performed on Zn-2%Cu alloy with a 5 kW continous wave CO2 laser. With increasing scanning rate from 6 mm/s to 1207 mm/s, the microstructure transition from light band to lamellar structure, cell, and finally to absolute stability planar, has been clearly observed in the laser molten pool. The experiment results are in good agreement with the prediction of interface response function calculated with Lin's numerical model for cellular/dendritic growth and Jackson-Hunt model for eutectic growth.

关 键 词：Zn-2%Cu 包晶合金 激光表面熔凝 高速层片状组织 绝对稳定平界面 

分 类 号：TG244[金属学及工艺—铸造]