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- 2018
放电等离子体烧结制备Mg85Zn6Y9颗粒增强Mg-9Al-1Zn复合材料组织与力学性能
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Abstract:
采用高能球磨法和放电等离子体烧结（SPS）技术，以包含100%长周期堆垛有序结构（LPSO）相Mg85Zn6Y9镁合金为原料，通过将其球磨成纳米晶颗粒后与Mg-9Al-1Zn（AZ91）镁合金雾化颗粒进行机械混合，并在350℃烧结温度下成功制备出不同质量分数（0~30wt%）的LPSO相Mg85Zn6Y9颗粒增强AZ91复合材料（Mg85Zn6Y9/AZ91）。采用光学显微镜（OM）、SEM及TEM对Mg85Zn6Y9/AZ91复合材料的微观组织结构进行表征；采用XRD分析其固溶处理前后的相转变；与此同时对复合材料进行显微硬度与压缩试验，综合研究其微观组织与力学性能的关系。相关结果表明，Mg85Zn6Y9颗粒经3 h高能球磨后颗粒尺寸显著减小，硬度随晶粒细化而提升。Mg85Zn6Y9增强颗粒主要分布在AZ91基体颗粒边界处，随着Mg85Zn6Y9质量分数的增加，增强相颗粒有相互结合成连续网格状趋势。增强颗粒与基体界面处未见明显过渡层，基体界面处的β相经400℃×24 h固溶处理后进入基体，部分增强颗粒亦转变为Mg相。本实验条件下制备的最佳性能的20wt% Mg85Zn6Y9/AZ91复合材料经固溶处理后的室温屈服强度从200 MPa转变为230 MPa，屈服强度均较未添加Mg85Zn6Y9的AZ91镁合金有较大的提高。 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. 国家自然科学基金（51701060）；国家外专局高端外国专家项目（GDW20171300102）；河北省教育厅基金（QN2015035）；河北省自然科学基金（E2016202130）；河北工业大学优秀青年科技创新基金（2015002）；燕山大学亚稳材料国家重点实验室开放基金（201609）
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