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研究了超音速火焰喷涂(HVOF,high velocity oxygen-fuel flame)微粒撞击诱导Mg-15Gd-3Y镁合金表面纳米化新工艺,分析了不同工艺参数对表层变形及纳米化的影响规律。发现撞击钢丸粒径大小、轰击距离和处理时间对表层组织和硬度分布具有重要影响。通过光学显微镜和透射电镜观察了表面自身纳米化处理后镁合金样品表层组织的形变特征和纳米化效果;利用显微硬度仪测试了样品从表面至基体的硬度分布;采用X射线衍射仪分析了纳米化处理前后样品表层的物相变化情况。检测结果显示,该工艺在镁合金材料表面成功实现了自身纳米化,表层晶粒细化至20nm左右,显微硬度提高至2倍以上,处理后样品表层没有出现氧化。
The new technology of surface nanocrystallization of Mg-15Gd-3Y magnesium alloy by HVOF (high velocity oxygen-fuel flame) particle impact was studied. The influence of different process parameters on surface deformation and nanocrystallization was analyzed. It is found that the size of impact shot size, bombardment distance and processing time have an important influence on the surface microstructure and hardness distribution. The deformation characteristics and the nano-effect of the nanostructured magnesium alloy surface were observed by optical microscope and transmission electron microscope. The hardness distribution of the sample from the surface to the matrix was measured by the microhardness tester. The surface morphology of the sample was analyzed by X-ray diffractometer Phase Change of Sample Surface before and after Nanocrystallization. The test results show that the surface of the magnesium alloy material successfully achieved its own nano-technology, the surface grain refinement to about 20nm, micro-hardness increased to more than 2 times, no oxidation of the sample surface after treatment.