Damping properties of as-cast Mg-xLi-1Al alloys with different phase composition

作     者：王敬丰 徐丹丹 鲁若鹏 潘复生 Jing-feng WANG;Dan-dan XU;Ruo-peng LU;Fu-sheng PAN

作者机构：重庆大学国家镁合金材料工程技术研究中心重庆400044 重庆大学材料科学与工程学院重庆400044 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2014年第24卷第2期

页      面：334-338页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Project(NCET-11-0554)supported by the Program for New Century Excellent Talents in University,China Project(2011BAE22B04)supported by the National Key Technology R&D Program,China Project(51271206)supported by the National Natural Science Foundation of China 

主　　题：damping magnesium-lithium alloys β-Li phase crystal structure 

摘      要：Three kinds of different phases of Mg-xLi-1Al alloys with x=5 （full α LA51）, 9 （dual-phase LA91）, and 14 （rich-βLA141） were prepared by vacuum melting method. Their microstructure and damping capacities were investigated by optical microscopy, X-ray diffractometry, and dynamic mechanical analysis. The results show that the addition of Li changes the crystal structure of the alloys and causes new damping mechanisms to emerge. And the appearance of BCC structure makes the damping performance improved remarkably. The lower the elastic modulus is, the smaller the strain is and even the slower the acceleration is. The dual-phase alloy shows a better damping capacity while the temperature changes. Furthermore, all three alloys have two significant peaks：P1 caused by the movement of dislocations on the basal planes and P2 caused by the sliding of grain boundaries.