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对经表面搅拌摩擦加工的1060纯铝进行不同温度下12h的离子氮化,通过金相分析、显微硬度测量和XRD检测,研究试样表层显微组织和性能的演变规律。结果表明:随离子氮化温度升高,试样不断发生再结晶晶粒长大。180℃离子氮化试样表面检测到较弱的AIN衍射峰,这是由于较低温度下试样未发生再结晶,搅拌摩擦加工形成的缺陷所造成的“快速扩散通道”作用促进离子氮化所致。300℃离子氮化试样表面未检测到AIN衍射峰,这是由于再结晶使“快速扩散通道”作用消失所致。450℃离子氮化试样表面检测到AIN衍射峰,这是由于高温下N离子扩散速度显著增大所致。最终导致试样显微硬度呈先降低后升高的趋势。
The 1060 pure aluminum with surface friction stir processing was subjected to 12h ion nitriding at different temperatures. The microstructure and properties of the samples were studied by means of metallographic analysis, microhardness measurement and XRD. The results show that with the increase of the temperature of ion nitriding, the recrystallized grain grows continuously. The weaker AIN diffraction peak was detected on the surface of the ion nitriding sample at 180 ℃, which is due to the “rapid diffusion channel” caused by the defect formed by the friction stir processing at lower temperature without recrystallization. Nitriding caused. The AIN diffraction peak was not detected on the surface of the ion nitriding sample at 300 ℃, which is due to the disappearance of “rapid diffusion channel” by recrystallization. The AIN diffraction peak was detected on the surface of the ion nitriding sample at 450 ℃, which was attributed to the significantly increased diffusion rate of N ions at high temperature. Finally, the microhardness of the sample first decreased and then increased.