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电子束物理气相沉积Ni-Cr-Al合金薄板微观组织研究 被引量:2

Microstructure of As-Deposited Ni-Cr-Al Alloy Thin Sheet by EBPVD
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摘要 采用电子束物理气相沉积技术(EB-PVD)在温度为700℃的不锈钢基片上沉积厚度为0.2mm的Ni-Cr-Al高温合金薄板,然后将合金薄板与基片剥离。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、原子力显微镜(AFM)和透射电子显微镜(TEM)等测试手段研究了Ni-Cr-Al合金薄板的微观组织。结果表明,沿厚度方向合金具有两种不同晶粒形貌的两层结构,在沉积材料的靠近基板侧观察到柱状晶区,同时表现出{111}织构,而在远离基板一侧晶粒形貌则为近等轴晶且无织构现象;合金表面晶粒细小均匀且呈岛状分布,每个"岛屿"由许多晶粒尺寸约为100 nm柱状晶粒组成;晶粒内部亚结构表现为孪晶。 Ni-Cr-Al alloy thin sheet with 0.2mm in thickness was deposited on a stainless substrate with 700℃ from a target of Ni-Cr- Al alloy by EB-PVD, and then was removed from the substrate. The thin sheet was characterized by scanning electronic microscopy ( SEM), X-ray diffraction ( XRD), atomic force microscopy ( AFM ) and transmission electron microscopy ( TEM ). It is found that the alloy consists of a two layer structure with different pattern along cross-section direction. Columnar crystals are formed on the substrate side, exhibiting a strong {111 } texture, while the equiaxed crystals are dominant on the evaporation side with no textures. Fine and uniform crystals, growing island-likely, are observed on the surface of the as-deposited alloy sheet, and each island consists of a lot of columnar crystals with about 100nm size. A high density of twins is visible Within the grains.
出处 《航空材料学报》 EI CAS CSCD 北大核心 2009年第5期7-10,共4页 Journal of Aeronautical Materials
基金 河南省教育厅自然科学基金项目(2009B430004) 河南工业大学引进人才项目资助
关键词 电子束物理气相沉积 Ni—Cr—Al合金 柱状晶 织构 孪晶 EB-PVD, Ni-Cr-Al alloy, Columnar crystals, texture, twin
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