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对采用电子束物理气相沉积(EB-PVD)技术制备Ni-20.3Cr-4.6Co-2.1Al高温合金薄板的微观组织结构进行了研究。结果表明:制备态合金薄板相组成为-γNi基固溶体,不存在第二相。合金在制备过程中的宏观、微观应力以及晶粒细化作用,导致相同位置衍射峰叠加,产生衍射峰宽化现象,具有不对称性。在OM和SEM下观察组织致密均匀、晶粒细化,晶粒间耐蚀程度存在差异;TEM观察其组织结构,存在应变条纹,亚结构缺陷主要为孪晶;AFM三维形貌图反映出晶粒光整、没有棱面,说明合金蒸气在结晶时,发生由气相→液相→固相的转变过程。
The microstructure of Ni-20.3Cr-4.6Co-2.1Al superalloy sheet fabricated by electron beam physical vapor deposition (EB-PVD) technique was studied. The results show that the phase composition of the as-prepared alloy sheet is -γNi-based solid solution without the presence of the second phase. The macroscopic, micro-stress and grain refinement of the alloy during the preparation lead to the superposition of the diffraction peaks at the same position, resulting in the broadening of the diffraction peak and the asymmetry. Under OM and SEM, the structure of the microstructure is dense and uniform, the grain size is fine and there is a difference in the corrosion resistance between the grains. The microstructure of the microstructure is observed by TEM. Strain stripes exist and the substructure defects are mainly twins. The three- Particle smooth, no facets, indicating alloy vapor in the crystallization, the occurrence of the gas → liquid → solid phase transformation process.