| HE Ji-dong,GAO Bo,HU Liang,ZHU Guang-lin,XING Peng-fei,XU Ning,LIU Chang,ZHOU Ying-wei,TU Gan-feng.Effects of HCPEB on Morphology and Hardness of Al-Si Alloy with Rare Earth Element[J],46(8):153-158 |
| Effects of HCPEB on Morphology and Hardness of Al-Si Alloy with Rare Earth Element |
| Received:March 07, 2017 Revised:August 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.08.025 |
| KeyWord:high current pulsed electron beam Al-17.5Si-0.3Nd alloy surface morphology Al matrix halo structure microhardness |
| Author | Institution |
| HE Ji-dong |
School of Metallurgy, Northeastern University, Shenyang , China |
| GAO Bo |
School of Metallurgy, Northeastern University, Shenyang , China |
| HU Liang |
School of Metallurgy, Northeastern University, Shenyang , China |
| ZHU Guang-lin |
School of Metallurgy, Northeastern University, Shenyang , China |
| XING Peng-fei |
School of Metallurgy, Northeastern University, Shenyang , China |
| XU Ning |
School of Metallurgy, Northeastern University, Shenyang , China |
| LIU Chang |
School of Metallurgy, Northeastern University, Shenyang , China |
| ZHOU Ying-wei |
School of Metallurgy, Northeastern University, Shenyang , China |
| TU Gan-feng |
School of Metallurgy, Northeastern University, Shenyang , China |
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| Abstract: |
| The work aims to improve microhardness of Al-17.5Si-0.3Nd alloy surface by modifying the surface with high current pulsed electron beam (HCPEB). Changes in surface morphology and performance of HCPEB-modified alloy were studied with FESEM, EPMA, XRD, and Vickers hardness tester. SEM and EPMA analysis results revealed that Al substrate and microcrack-free halo structure were generated on the surface of HCPEB-treated alloy, and all elements on the alloy surface were distributed uniformly in modified layer. XRD analysis results showed that no new phase was formed after HCPEB treatment, and all diffraction peaks broadened and shifted. Diffraction peaks firstly moved toward high angle and then toward low angle as pulse numbers increased. The largest shift angle was present in the sample treated with 5 pulses. In addition, microhardness test results demonstrated that microhardness of Al substrate increased from 534.95 MPa (for initial sample) to 1258.59 MPa (sample treated with 25 pulses) as pulse number increased, while microhardness of the halo microstructure sharply decreased from 10067.7 MPa (for initial sample) to 1390.29 MPa (sample treated with 25 pulses) as pulse number increased. The grains of alloy surface are markedly refined after HCPEB modification, and surface hardness of alloy surface is increased as a whole. |
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