李魁,高波,徐宁,任娅维,邢鹏飞.Mg元素对强流脉冲电子束改性后Al-20Si合金表面微观组织及性能的影响[J].表面技术,2020,49(1):213-220.
LI Kui,GAO Bo,XU Ning,REN Ya-wei,XING Peng-fei.Effects of Mg on Surface Microstructure and Mechanical Properties of HCPEB Treated Al-20Si Alloy[J].Surface Technology,2020,49(1):213-220 |
| Mg元素对强流脉冲电子束改性后Al-20Si合金表面微观组织及性能的影响 |
| Effects of Mg on Surface Microstructure and Mechanical Properties of HCPEB Treated Al-20Si Alloy |
| 投稿时间：2019-04-28 修订日期：2020-01-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.01.025 |
| 中文关键词: 强流脉冲电子束 过共晶铝硅合金 镁元素 微裂纹 显微硬度 耐磨性 |
| 英文关键词:HCPEB hypereutectic Al-Si alloy magnesium microcracks microhardness wear resistance |
| 基金项目:国家自然科学基金（51671052）；中央高校基本科研业务费专项资金（N182502042） |
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| Author | Institution |
| LI Kui | School of Metallurgy, Northeastern University, Shenyang 110819, China |
| GAO Bo | School of Metallurgy, Northeastern University, Shenyang 110819, China |
| XU Ning | School of Metallurgy, Northeastern University, Shenyang 110819, China |
| REN Ya-wei | School of Metallurgy, Northeastern University, Shenyang 110819, China |
| XING Peng-fei | School of Metallurgy, Northeastern University, Shenyang 110819, China |
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| 中文摘要: |
| 目的 通过添加Mg元素改善Al-20Si合金的组织，提升其表面力学性能。方法 运用场发射扫描电镜（FESEM）、显微硬度计及多功能材料表面性能试验仪等一系列检测手段，考察Mg元素对强流脉冲电子束改性Al-20Si合金表面效果的影响，及合金表面微观组织和表面力学性能的变化。结果 Mg元素能与硅相形成更细小的Mg2Si相来细化初生硅相，同时可改善强流脉冲电子束处理后铝硅合金表面产生的微裂纹。材料表面经强流脉冲电子束改性后，所有的衍射峰发生了宽化及偏移。两组合金铝基体的显微硬度随着脉冲数的增加而逐渐递增，Al-20Si合金铝基体的显微硬度由745.5 MPa增加到2170.7 MPa，Al-20Si-5Mg合金的铝基体显微硬度由1061.3 MPa增加到2403.6 MPa，Mg元素的添加可提高Al-20Si合金的硬度。另外，通过往复摩擦试验发现，Mg元素及强流脉冲电子束都能提高材料的耐磨性。结论 Mg元素能改善强流脉冲电子束处理后Al-20Si合金表面的微观组织，添加Mg元素后，Al-20Si合金表面的力学性能得到提高。 |
| 英文摘要: |
| The paper aims to improve the structure of Al-20Si alloy by adding Mg to improve its surface mechanical properties. In this experiment, a series of tests were carried out with field emission scanning electron microscopy (FESEM), microhardness tester, and a multi-functional surface property tester to study the surface microstructure and surface mechanical properties of Al-20Si alloy surface treated by HCPEB modified by adding Mg element. The Mg could refine the primary silicon phase by forming finer Mg2Si phase with the Silicon phase, while Mg element could eliminate the microcracks on the Al-Si alloy surface which formed after HCPEB treatment. All the diffraction peaks were broadened and shifted after the material surface was modified by HCPEB treatment. The Al matrix microhardness of these two alloys gradually increased with the increase of the pulse number. The microhardness of Al-20Si alloy Al substrate increased from 745.5 MPa (for initial sample) to 2170.7 MPa (sample treated with 25 pulses), the microhardness of Al-20Si-5Mg alloy Al substrate increased from 1061.3 MPa (for initial sample) to 2403.6 MPa (sample treated with 25 pulses). Meanwhile, the addition of Mg improved the hardness of Al-20Si alloy. In addition, reciprocate fraction test showed that both Mg and HCPEB could improve the wear resistance of material. It can be summarized that adding Mg element can modify the microstructure of the Al-20Si alloy after HCPEB treatment, and improved the surface mechanical properties of Al-20Si alloy treated by HCPEB. |
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