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
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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1.83GW·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2.34GW·cm-2时,试样表面的晶粒尺寸增大;当激光功率密度为2.85GW·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。
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 is2.85 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.
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 is2.85 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.
引文
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[2]Cao Y P,Zhou D C,Feng A X,et al.Simulation and experiment of transmission mechanism on laser shock wave loading 690 high-strength steel sheet[J].Chinese Journal of Lasers,2016,43(11):1102010.曹宇鹏,周东呈,冯爱新,等.激光冲击波加载690高强钢薄板传播机制的模拟与实验[J].中国激光,2016,43(11):1102010.
[3]Cao Y P,Xu Y,Feng A X,et al.Experimental study of residual stress formation mechanism of 7050aluminum alloy sheet by laser shock processing[J].Chinese Journal of Lasers,2016,43(7):0702008.曹宇鹏,徐影,冯爱新,等.激光冲击强化7050铝合金薄板表面残余应力形成机制的实验研究[J].中国激光,2016,43(7):0702008.
[4]Li K,Xiong J J,Ma S J,et al.Temperature effect on crack propagation properties of aluminum alloys in aircraft[J].Journal of Beijing University of Aeronautics and Astronautics,2017,43(4):761-768.李矿,熊峻江,马少俊,等.航空铝合金系列材料裂纹扩展性能的温度效应[J].北京航空航天大学学报,2017,43(4):761-768.
[5]Ge M Z,Xiang J Y,Zhang Y K.Effect of laser shock processing on resistance to stress corrosion cracking of tungsten inert-gas welded AZ31Bmagnesium alloy[J].Chinese Journal of Lasers,2012,39(12):1203007.葛茂忠,项建云,张永康.激光冲击处理对AZ31B镁合金焊接件抗应力腐蚀的影响[J].中国激光,2012,39(12):1203007.
[6]Zhou J Z,Wei D H,Huang S,et al.Microscale laser shock peening on TiN coatings[J].Optics and Precision Engineering,2011,19(11):2679-2684.周建忠,卫登辉,黄舒,等.微尺度激光喷丸强化TiN涂层的表面性能[J].光学精密工程,2011,19(11):2679-2684.
[7]Ge M Z,Xiang J Y,Zhang Y K.Surface nanocrystallization of AZ31B magnesium alloy induced by laser shock processing[J].Rare Metal Materials and Engineering,2014,43(4):856-861.葛茂忠,项建云,张永康.激光冲击处理诱导AZ31B镁合金表面纳米化[J].稀有金属材料与工程,2014,43(4):856-861.
[8]Zhang Q L,Zhao B,Zhang B X,et al.Effect of multiple-laser shock processing on microstructure and residual stress ofЭП866 martensitic stainless steel[J].Chinese Journal of Lasers,2016,43(11):1102009.张青来,赵博,张冰昕,等.多次激光冲击强化对Э∏866马氏体不锈钢组织及残余应力的影响[J].中国激光,2016,43(11):1102009.
[9]Zhong Z L.Surface integrity and corrosion resistance in high speed milling aluminum alloy 7050-T7451[D].Jinan:Shandong University,2015:15-23.仲照琳.高速铣削铝合金7050-T7451表面质量及耐腐蚀性研究[D].济南:山东大学,2015:15-23.
[10]Rohatgi A,Soulami A,Stephens E V,et al.An investigation of enhanced formability in AA5182-O Al during high-rate free-forming at room-temperature:Quantification of deformation history[J].Journal of Materials Processing Technology,2014,214(3):722-732.
[11]Wan Z Y,Fan J Z,Tian X F,et al.Bulk nanocrystalline Al-Zn-Mg-Cu series aluminum alloy prepared by cryomilling[J].Chinese Journal of Rare Metals,2005,29(6):827-831.万志永,樊建中,田晓风,等.低温球磨法制备块体纳米晶Al-Zn-Mg-Cu系铝合金[J].稀有金属,2005,29(6):827-831.
[12]Lu J Z.Investigation of laser shock processing on the mechanical properties and micro-plastic deformation mechanism of LY2aluminum alloy[D].Zhenjiang:Jiangsu University,2010.鲁金忠.激光冲击强化铝合金力学性能及微观塑性变形机理研究[D].镇江:江苏大学,2010.
[13]Sun Z Y,Liu C M.Diffusion and phase transformation in alloys[M].Shenyang:Northeastern University Press,2002.孙振岩,刘春明.合金中的扩散与相变[M].沈阳:东北大学出版社,2002.
[14]Qi Y H,Yang G Y,Zhang L L,et al.Study on the microstructure coarsening of Al-Zn-Mg-Cu alloy during semi-solid isothermal heat-treatment[J].Rare Metal Materials and Engineering,2011,40(3):413-417.齐元昊,杨光昱,张丽丽,等.Al-Zn-Mg-Cu合金半固态等温组织粗化研究[J].稀有金属材料与工程,2011,40(3):413-417.
[15]Luo X M,Wang X,Chen K M,et al.Effect of dislocation and its motion on surface modification of aero-aluminum alloy by laser shock processing[J].Transactions of Materials and Heat Treatment,2013,34(9):160-166.罗新民,王翔,陈康敏,等.位错及其运动在航空铝合金激光冲击表面改性中的作用[J].材料热处理学报,2013,34(9):160-166.
[16]Luo X M,Wang X,Chen K M,et al.Surface layer high-entropy structure and anti-corrosion performance of aero-aluminum alloy induced by laser shock processing[J].Acta Metallurgica Sinica,2015,51(1):57-66.罗新民,王翔,陈康敏,等.激光冲击诱导的航空铝合金表层高熵结构及其抗蚀性[J].金属学报,2015,51(1):57-66.
[17]Luo X M,Zhang J W,Ma H,et al.Dislocation configurations induced by laser shock processing of2A02aluminum alloy[J].Acta Optica Sinica,2011,31(7):0714002.罗新民,张静文,马辉,等.2A02铝合金中强激光冲击诱导的位错组态分析[J].光学学报,2011,31(7):0714002.