热处理对Mg_(81)Ni_8Zn_5Y_6合金中长周期结构的影响  

Effect of heat treatment on long-period stacking ordered structure of Mg_(81)Ni_8Zn_5Y_6 alloy

作　　者：付丽丽[1,2] 邱克强[1] 任英磊[1] 李荣德[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]辽宁石化职业技术学院石油化工系,锦州121001

出　　处：《中国有色金属学报》2016年第7期1414-1419,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目(2011CB606301)~~

摘　　要：采用铜模铸造法制备直径为3 mm的Mg_(81)Ni_8Zn_5Y_6非晶复合材料,并分别在473和773 K条件下对材料等温热处理5 h。采用扫描电镜(SEM)、高分辨透射电子显微镜(HRTEM)、X射线衍射仪(XRD)等方法分别对铸态、热处理态复合材料的组织、相组成和结构进行分析,研究长周期(LPSO)相的热稳定性及不同长周期(LPSO)结构间的转化过程。结果表明:铸态Mg_(81)Ni_8Zn_5Y_6非晶复合材料的LPSO相为14H结构;473 K热处理5 h后,LPSO相转化为18R结构;773 K热处理5 h后,LPSO相转化为稳定的6H结构;成分和热处理温度均对长周期转化类型有影响。Mg_（81）Ni_8Zn_5Y_6 amorphous matrix composites with 3 mm in diameter were fabricated by conventional Cu-mold casting method and the resultant samples were heat-treated at 473 and 773 K for 5 h, respectively. The microstructure, phase constituent and structure of the as-cast and the annealed samples were analyzed by scanning electron microscopy（SEM）, high-resolution transmission electron microscopy（HRTEM） and X-ray diffractometry（XRD）. The thermal stability and the transformation process of different long-period stacking ordered（LPSO） structure were investigated. The results show that the LPSO structure in the as-cast sample, the（473 K, 5 h）-annealed sample and the（773 K, 5 h）-annealed sample are 14 H, 18 R and 6H, respectively. Furthermore, the LPSO structure formation is influenced by both the composition of the alloy and the temperature of heat treatment employed.

关 键 词：MgNiZnY合金 非晶复合材料 热处理 长周期结构 热稳定性 

分 类 号：TG139.8[一般工业技术—材料科学与工程]