庞勇;曾岗;
1:河南公安高等专科学校
2:哈尔滨工业大学材料科学与工程学院
摘要：采用电子束物理气相沉积(EB-PVD)工艺制备了NiCrAl高温合金薄板。采用XRD对薄板进行了相分析,结果表明,这种高温合金薄板是由γ′和γ两相组成。从薄板的横截面显微组织分析表明,高温合金中γ′以颗粒状形式弥散分布在γ基体上;从薄板的纵截面可以看出,组织为柱状晶和粒状晶交替组织。薄板的常温抗拉强度为446.89MPa。较低的抗拉强度是由于其组织不均匀并且含有柱状晶组织,柱状晶的组织各向异性,拉伸方向不是最佳受力方向。
关键词： 电子束物理气相沉积(EB-PVD);;薄板;;NiCrAl合金
Abstract: The microstructures of
as-deposited NiCrAl alloy freestanding sheet by a electron beam-physical vapor
deposition(EB-PVD)method were investigated by means of X-ray
diffractometry,Scanning Electron Microscopy and Optical Microscopy.The results
showed that the superalloy component exists mainly in γ and γ′phases.And γ′phase was dispersed in the γ matrix from the cross-sectional micrographs of as-deposited NiCrAl
superalloy sheet by EB-PVD.At the same time,it can be observed that the
equiaxed grain and columnar grain were grown by turn form the vertical-section
micrography of the sheet.The tensile strength was only 446.89MPa at room
temperature,due to the structural non-homogeneous and the presence of columnar
grains.
Keywords: Electron Beam-Physical Vapor
Deposition(EB-PVD);Sheet;NiCrAl Alloy
基金项目: 国家自然科学基金委员会资助(资助号:90205034)
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