【摘要】 采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)、电子背散射衍射(EBSD)和显微硬度仪等研究了含2.7%Cu和0.01%Cu的两组镍基合金试样经固溶与固溶+双级时效后的显微组织和硬度。结果表明：Cu元素对镍基合金显微组织与维氏硬度有重要影响。经1153℃保温2 h后，含2.7%与0.01%Cu试样的平均晶粒尺寸分别增加到121和178μm,激活能分别为3824.44和5603.63 kJ/mol,维氏硬度分别降低至181和149 HV。经1153℃保温1 h再进行双级时效后，含2.7%Cu与0.01%Cu的试样晶粒尺寸分别为75和107μm,维氏硬度分别提高至449和369 HV。含2.7%Cu的试样有细小TiN、含Cu的Laves相弥散分布在晶界与晶间，含0.01%Cu的试样仍有大量呈不连续Laves相分布在基体中。更多还原

【Abstract】 Microstructure and hardness of two kinds of nickel-based alloy samples containing 2.7% Cu and 0.01% Cu were studied by means of optical microscope(OM), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS) analysis, electron backscatter diffraction(EBSD) technique and microhardness tester after solution treatment and solution treatment plus two-stage aging treatment. The results show that Cu element has a significant effect on the microstructure and Vickers hardness of the nickel-based alloys. After solution treatment at 1153 ℃ for 2 h, the average grain size of the samples containing 2.7% Cu and 0.01% Cu increases to 121 μm and 178 μm, respectively, the activation energies are 3824.44 and 5603.63 kJ/mol, respectively, and the Vickers hardness decreases to 181 HV and 149 HV, respectively. After solution treatment at 1153 ℃ for 1 h and two-stage aging, the grain sizes of the samples containing 2.7% Cu and 0.01% Cu are 75 μm and 107 μm, respectively, and the Vickers hardness increases to 449 HV and 369 HV, respectively. The sample containing 2.7% Cu has fine TiN, and the Laves phase containing Cu is dispersed at grain boundaries and intergranular boundaries. The sample containing 0.01% Cu still has a large number of discontinuous Laves phases distributed in the matrix.更多还原