中国激光, 2018, 45 (5): 0502003, 网络出版: 2018-05-02
激光冲击7050-T7451铝合金表面的X射线衍射图谱与微结构的相关性 下载: 842次
Correlation Between X-Ray Diffraction Pattern and Microstructure of Laser Shock Processed 7050-T7451 Aluminum Alloy Surface
激光技术 激光冲击强化 7050-T7451铝合金 X射线衍射 微结构 laser technique laser shock processing 7050-T7451 aluminum alloy X-ray diffraction microstructure
摘要
采用脉冲激光对7050-T7451铝合金表面进行了激光冲击强化处理。利用X射线衍射仪(XRD)和场发式透射电镜(TEM), 获得了试样表面衍射图谱和微观组织形貌, 建立了激光冲击强化7050-T7451铝合金表面的微结构响应模型。结果表明, 当激光功率密度为1.83 GW·cm-2时, 试样表面发生了过饱和固溶体的失稳分解;当激光功率密度为2.34 GW·cm-2时, 试样表面的晶粒尺寸增大;当激光功率密度为2.85 GW·cm-2时, 试样表面产生了纳米晶。激光冲击强化7050-T7451铝合金表面的XRD图谱与TEM分析结果具有一致性。
Abstract
Pulsed laser shocks are adopted to conduct a shock penning processing on the surface of 7050-T7451 aluminum alloys, and the diffraction pattern and microstructure of specimen surface are obtained by the X-ray diffractometer (XRD) and the field emission transmission electron microscope (TEM). A microstructure response model of the laser shock processed 7050-T7451 aluminum alloy surface is established. The results indicate that, when the laser power density is 1.83 GW·cm-2, the destabilization decomposition of supersaturated solid solution occurs; when the laser power density is 2.34 GW·cm-2, the grain size increases; when the laser power density is 2.85 GW·cm-2, nanocrystals are produced on the specimen surface. The XRD pattern and the TEM analysis results of laser shock processed 7050-T7451 aluminum alloy surface are of consistency.
曹宇鹏, 陈浩天, 冯爱新, 周锐, 花国然, 蒋苏州. 激光冲击7050-T7451铝合金表面的X射线衍射图谱与微结构的相关性[J]. 中国激光, 2018, 45(5): 0502003. Cao Yupeng, Chen Haotian, Feng Aixin, Zhou Rui, Hua Guoran, Jiang Suzhou. Correlation Between X-Ray Diffraction Pattern and Microstructure of Laser Shock Processed 7050-T7451 Aluminum Alloy Surface[J]. Chinese Journal of Lasers, 2018, 45(5): 0502003.