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纳米Al2O3/Ni基合金复合材料激光熔覆层组织
引用本文:李明喜,何宜柱,孙国雄.纳米Al2O3/Ni基合金复合材料激光熔覆层组织[J].中国激光,2004,31(9):149-1152.
作者姓名:李明喜  何宜柱  孙国雄
作者单位:1. 安徽上业大学激光加工研究中心,安徽,马鞍山,243002;东南大学材料科学与工程系,江苏,南京,210096
2. 安徽上业大学激光加工研究中心,安徽,马鞍山,243002
3. 东南大学材料科学与工程系,江苏,南京,210096
基金项目:安徽省科技厅重点科研项目 (0 4 0 2 2 0 0 4 )资助课题。
摘    要:采用横流5kW CO2激光,在Ni基高温合金表面制备了纳米Al2O3/Ni基合金复合材料激光熔覆层。利用光学显微镜、扫描电镜(SEM)及附件(EDS)分析了熔覆层的快速凝固组织、成分及纳米颗粒的分布。结果表明,未加纳米Al2O3时界面区为垂直于界面、定向生长的柱状树枝晶组织;加入纳米Al2O3后,熔池凝固结晶组织形态发生变化,由细长的柱状树枝晶逐步过渡为较短的树枝晶;当Al2O3的加入量为1%时,熔覆层与基体的界面区不出现定向生长,整个断面呈现等轴枝晶组织;纳米Al2O3促进固液界面前沿形核,纳米Al2O3附着在晶体生长的前沿,阻碍晶体的长大,凝固组织得到显著细化;纳米Al2O3颗粒抑制了熔覆层裂纹的形成。

关 键 词:激光技术  激光熔覆  纳米Al2O3  组织
收稿时间:2003/4/28

Al2O3 Nanocrystalline/Ni-Based Alloy Composite Coatings Produced by Laser Cladding
LI Ming-xi ,HE Yi-zhu,SUN Guo-xiong Research Center for Laser Processing,Anhui University of Technology,Maanshan,Anhui ,China.Al2O3 Nanocrystalline/Ni-Based Alloy Composite Coatings Produced by Laser Cladding[J].Chinese Journal of Lasers,2004,31(9):149-1152.
Authors:LI Ming-xi    HE Yi-zhu  SUN Guo-xiong Research Center for Laser Processing  Anhui University of Technology  Maanshan  Anhui  China
Affiliation:LI Ming-xi 1,2,HE Yi-zhu1,SUN Guo-xiong2 1Research Center for Laser Processing,Anhui University of Technology,Maanshan,Anhui 243002,China 2Department of Mechanical Science and Engineering,Southeast University,Nanjing,Jiangsu 210096,China
Abstract:Composite coatings of Al_2O_3 nanocrystalline/Ni-based powder produced by transverse flow CO_2 laser on Ni-based superalloy were introduced. With Olympus Pme-3 type optical microscope, Philip-XL 30 type scanning electronic microscope (SEM) and energy dispersive X-ray spectroscopy (EDS), the microstructure, chemical composition and distribution of nano particles of the cross-sections of the coatings were analyzed. The results showed that columnar dendrite grew perpendicularly to the interface without nano Al_2O_3 particles. And the growth morphologies of dendrite transformed from long columnar to short form by adding nano additives. Non-directional dendrite growth at the interface and equaxied dendrite across the section of the clad appeared with the additive amount of Al_2O_3 particles to 1%. The solidified microstructure was greatly refined because the nano Al_2O_3 accelerated nucleation ahead of the advancing interface of solid/liquid and held back crystal growth by its concentration. Nano particles prevented the formation of cracks in the coatings.
Keywords:laser technique  laser cladding  nanocrystalline Al_2O_3  microstructure
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