Cavitation and grain boundary sliding during creep of Mg-Y-Nd-Zn-Mn alloy

作     者：V.JANíK F.HNILICA P.ZUNA V.OENEK I.STULíKOV 

作者机构：Department of Materials EngineeringFaculty of Mechanical EngineeringCzech Technical University in PraguePragueCzech Republic Research Institute for MetalsPanenské BrezanyCzech Republic Faculty of Mathematics and PhysicsCharles UniversityPragueCzech Republic 

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

年 卷 期：2008年第18卷第A01期

页      面：64-68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] 0703[理学-化学] 0813[工学-建筑学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Project(106/06/0252)supported by the Czech Science Foundation Project(CTU0810412)supported by the Grant Agency of the CzechTechnical University in Prague 

主　　题：镁合金 锌合金 锰合金 高温 测试 

摘      要：Creep of squeeze-cast Mg-3Y-2Nd-1Zn-1Mn alloy was investigated at the constant load in the stress range of 30-80 MPa. Tensile creep tests were performed at 300℃up to the final *** tests at 50 MPa were interrupted after reaching the steady state creep;and another set of creep tests was interrupted after the onset of ternary *** of cavitated dendritic boundaries was evaluated using optical *** of grain boundary sliding by observation of the offset of marker lines was carried out on the surface of the crept specimens after the test interruption by scanning electron microscopy and by confocal laser scanning *** results show that the dominant creep mechanism in this alloy is dislocation creep with minor contribution of the grain boundary *** failure took place by the nucleation,growth and coalescence of creep cavities on the boundaries predominantly oriented perpendicular to the applied *** amount of cavitated boundaries with time of creep exposure supports the mechanism of continuous cavity nucleation and growth.