强流脉冲电子束处理对Mg67Zn30Y3准晶合金微观组织和性能的影响.docVIP

 强流脉冲电子束处理对 Mg67Zn30Y3 准晶 合金微观组织和性能的影响# 高波，江飞，郝仪，张文凤，李世伟，胡亮，涂赣峰* 5 10 15 20 25 30 35 40 （东北大学材料与冶金学院，沈阳 110004） 摘要：本文中，利用强流脉冲电子束对 Mg67Zn30Y3 准晶合金进行表面改性处理。通过 SEM 和 TEM 对处理前后样品的表层微观组织进行分析，并测量改性样品的截面显微硬度。结果 表明，强流脉冲电子束处理使样品表面发生重熔，相界模糊，有大量细小纳米准晶弥散分布， 平均颗粒尺寸为 10~20nm。重熔层厚度随脉冲次数的增加而增加，从 5.20μm（2 次脉冲） 变成 7.41μm（15 次脉冲）。改性表层组织的变化导致硬度的提高，经电子束处理后合金截 面显微硬度与原样相比有增大的趋势，最大显微硬度出现在 50~100μm 深度范围内。总而言 之，强流脉冲电子束改性处理能有效地改善 Mg67Zn30Y3 准晶合金表层组织结构和性能。 关键词：表面处理；强流脉冲电子束；纳米准晶；Mg67Zn30Y3；重熔层；截面显微硬度 中图分类号：TF134; TG146.2 Effect of high current pulsed electron beam on microstructure and properties of Mg67Zn30Y3 quasicrystal alloy GAO Bo, JIANG Fei, HAO Yi, ZHANG Wenfeng, LI Shiwei, HU Liang, TU Ganfeng (School of Materials and Metallurgy, Northeastern Unversity, Shenyang 110004) Abstract: In this paper, the Mg67Zn30Y3 quasicrystal alloy was bombarded through high current pulsed electron beam (HCPEB). The surface structures of Mg67Zn30Y3 quasicrystal alloy before and after HCPEB treatment were imvestigated by scanning electron microscope (SEM) and transmission electron microscope (TEM), and cross-sectional microhardness was examined using a 401 MVDTM vickers hardness. The results indicate that HCPEB treatment leads to rapid remelting of alloy surface, so the phase boundaries become indistinct, and a large numner of tiny nan-oquasicrystals are dispersedly distributed in surface layer, and average sizes are about 10~20nm. The thickness of remelted layer induced by HCPEB increases with the increase of pulse number, and it is increased from 5.20μm of 2-pulse sample to 7.41μm of 15-pulse sample. The microstructure variation results in the hardness enhancement. The cross-sectional microhardness of Mg67Zn30Y3 quasicrystal alloy has a growing tendency after HCPEB bombardment compared with initial sample. The maximal hardness appears 50~100μm depth range. In sum, the HCPEB treatment are able to improve effectively surface structure and property of Mg67Zn30Y3 quasicrystal alloy. Key words: Surface tr