Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第7期    总第208期    2016年7月

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文章编号:1004-0609(2016)-07-1414-06
热处理对Mg81Ni8Zn5Y6合金中长周期结构的影响
付丽丽1, 2,邱克强1,任英磊1,李荣德1

(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
)

摘 要: 采用铜模铸造法制备直径为3 mm的Mg81Ni8Zn5Y6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Mg81Ni8Zn5Y6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。

 

关键字: MgNiZnY合金;非晶复合材料;热处理;长周期结构;热稳定性

Effect of heat treatment on long-period stacking ordered structure of Mg81Ni8Zn5Y6 alloy
FU Li-li1, 2, QIU Ke-qiang1, REN Ying-lei1, LI Rong-de1

1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. Petrol-Chemical Department, Liaoning Petrol-Chemical Vocational and
Techonology College, Jinzhou 121001, China

Abstract:Mg81Ni8Zn5Y6 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 14H, 18R and 6H, respectively. Furthermore, the LPSO structure formation is influenced by both the composition of the alloy and the temperature of heat treatment employed.

 

Key words: MgNiZnY alloy; amorphous matrix composites; heat treatment; long-period stacking ordered structure; thermal stability

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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