Microstructural evolution and mechanical properties of Mg85Zn6Y9 powder reinforced Mg-9Al-1Zn composites prepared by spark plasma sintering

被引：0

作者：

Li Z. ^{[1
]}

Yu H. ^{[2
]}

Fan S. ^{[2
]}

Cai X. ^{[3
]}

Peng Q. ^{[3
]}

Yang M. ^{[2
,4
]}

Yu H. ^{[2
]}

机构：

[1] Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, School of Materials Science and Engineering, Shandong University, Ji'nan

[2] School of Materials Science and Engineering, Hebei University of Technology, Tianjin

[3] State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao

[4] Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, Hebei University of Technology, Tianjin

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2018年 / 35卷 / 09期

关键词：

High energy ball milling; Long period stacking ordered structure; Magnesium matrix composites; Mechanical properties; Microstructure; Spark plasma sintering;

D O I：

10.13801/j.cnki.fhclxb.20171228.004

中图分类号：

学科分类号：

摘要：

The composition of as-cast Mg85Zn6Y9 alloy with almost 100% long period stacking ordered structure (LPSO) phase was milled into nanocrystalline powder by the high energy ball milling, then was mechanical blended with atomized Mg-9Al-1Zn(AZ91) powder. The Mg85Zn6Y9/AZ91 composites with the mass fraction of Mg85Zn6Y9 powder from 0wt% to 30wt% were prepared by spark plasma sintering (SPS) at 350℃. The microstructure of Mg85Zn6Y9/AZ91 composites was characterized with optical microscope (OM), SEM and TEM; XRD was used to analyze phase transition of the composite before and after solid solution treatment; microhardness and compression test were also carried out to study the mechanical properties of the composites. The results show that the Mg85Zn6Y9 powder's grain size decreases and the microhardness of the Mg85Zn6Y9 powder increases obviously after 3 h high energy ball milling. In addition, the Mg85Zn6Y9 powder is mainly distributed at the boundaries of the AZ91 matrix powder. With more addition of Mg85Zn6Y9 powder, the Mg85Zn6Y9 powders likely combine with each other to form a continuous grid. Moreover, there is no obvious transition layer at the interface between Mg85Zn6Y9 powder and matrix. After solid solution treatment at 400℃ for 24 h, β phase is dissolved into the matrix and LPSO phase is disappeared gradually. The compressive yield strength at room temperature of the prepared 20wt% Mg85Zn6Y9/AZ91 composite with best performance changes from 200 MPa to 230 MPa, which the yield strength is significantly enhanced compared with AZ91 without Mg85Zn6Y9 powder addition. © 2018, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.

引用

页码：2512 / 2520

页数：8

共 21 条

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