ZM6合金室温蠕变机理研究  

Creep Mechanism of Mg-Nd-Zn-Zr(ZM6) Alloy at Ambient Temperature

作　　者：仲莹莹[1,2] 张新明[2] 邓运来[2] 许树芳[1] 余艳兵[1] 沈枫[1] 

机构地区：[1]航天科工防御技术研究试验中心,100854 [2]中南大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2009年第4期378-381,共4页Special Casting & Nonferrous Alloys

基　　金：国家重大基础研究计划(973计划)资助项目(6133002E)

摘　　要：采用单轴拉伸法对Mg-Nd-Zn-Zr(ZM6)合金在308K的蠕变行为进行了测试。在低于屈服强度的应力下,随应力的增加,蠕变量增加。通过蠕变量、应力与时间的关系,获得了蠕变速率及蠕变应力指数。通过比较各种蠕变机制的蠕变速率,确定合金室温蠕变机制为位错滑移。TEM分析表明,镁合金蠕变过程中发生了基面滑移,也存在极少量的孪生。Creep behavior of Mg-Nd-Zn-Zr(ZM6) alloy at 308 K was tested by a uniaxial tension method. The results show that with stress less than yield strength, creep rate is increased with increasing in stress. Creep rate and creep stress exponent were determined by analyzing relation of creep stress with time. Creep mechanism of the ZM6 alloy at ambient temperature is characterized by dislocation slipping. Datum plane slipping accompanying with few twins can be observed by TEM (transmission electron microscope) during creeping process.

关 键 词：镁合金 室温蠕变 孪生 滑移 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG111.8[金属学及工艺—金属材料]