论文部分内容阅读
采用真空高温微波炉对表面自身纳米化处理前后的Mg-Gd系稀土变形镁合金试样进行了粉末包覆扩散合金化试验。通过光学显微镜和高分辨透射电镜研究了由表层沿厚度方向不同变形层区的微观结构特点及微观组织细化特征,并通过X射线衍射仪对不同条件下微波处理的合金化层的物相进行了分析。结果表明,塑性变形层的微观组织和结构呈梯度分布,在试样表层形成了尺寸为10~20nm晶界清晰的纳米晶粒;微波诱导显著降低了扩散合金化温度,具有纳米化表层的镁合金在320℃实现了Al元素合金化;高体积分数的晶界和严重的畸变,促进了扩散合金化进程,且在相同试验条件下,纳米化处理的合金化层厚度达到未经纳米化处理的2~3倍。
The Mg-Gd-based rare earth deformed magnesium alloy samples before and after the nanocrystallization treatment on the surface were subjected to a powder coating alloying experiment with a vacuum high-temperature microwave oven. The microstructure and microstructure refinement characteristics of different deformable layers along the thickness direction were studied by optical microscope and high resolution transmission electron microscope. The phases of alloying layers under microwave irradiation under different conditions were characterized by X-ray diffraction Analysis. The results show that the microstructure and structure of the plastically deformed layer are graded, and the crystal grain boundaries with size of 10 ~ 20 nm are formed on the surface of the plaque. The microwave induced reduction of diffusion alloying temperature, Alloying at 320 ℃ achieved Al alloying; high volume fraction of grain boundaries and severe distortion, promoted the diffusion alloying process, and under the same experimental conditions, the thickness of the nanocrystallization of the alloy reaches the non-nano-treatment 2 to 3 times.