Effect of ultrasonic on morphology of primary Mg_2Si in in-situ Mg_2Si/Al composite  

超声波对原位Mg_2Si/Al复合材料中初生Mg_2Si形态的影响(英文)

作　　者：张家陶[1] 赵宇光[1] 徐晓峰[1] 刘晓波[1] 

机构地区：[1]吉林大学材料科学与工程学院,汽车材料教育部重点实验室,长春130025

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第10期2852-2856,共5页中国有色金属学报（英文版）

摘　　要：Effects of ultrasonic on morphologies of primary Mg2Si crystals in in-situ Mg2Si/A1 composite were investigated by metallographic microscopy and field emission scanning electron microscopy. The results show that the mean grain size of primary MgESi crystals is refined from 150 to 20 μm by high intensity ultrasonic, and the morphologies of primary MgESi crystals are changed as well. Optical microscopy reveals that primary MgESi crystals without ultrasonic vibration exhibit coarse particles with cavities, in which eutectic structures grow. However, primary Mg2Si crystals with ultrasonic vibration appear fine grains without any cavity. Three-dimensional morphologies of primary Mg2Si without ultrasonic vibration display octahedron and tetrakaidecahedron with hopper-like hole in the crystals. After ultrasonic vibration, primary Mg2Si particles become solid crystals with rounded comers and edges.采用光学显微镜和场发射扫描电镜,研究超声波对原位Mg2Si/Al复合材料中初生Mg2Si形态的影响。研究结果表明:超声波处理使初生Mg2Si的晶粒尺寸从150μm降低到20μm,初生Mg2Si形态发生改变。在二维形貌中,未实施超声波振动处理的初生Mg2Si晶粒生长为含有空腔的粗大颗粒,共晶组织生长于其中,相应的三维形态为含有漏斗状空腔的八面体和十四面体。超声波处理后的初生Mg2Si晶粒变成细小、实心三维形态的颗粒,颗粒棱角已发生钝化效应。

关 键 词：ULTRASONIC Mg2Si/AI composite MG2SI MORPHOLOGY grain refinement 

分 类 号：TB331[一般工业技术—材料科学与工程]