标题：High resolution transmission electron microscopy studies of σ phase in Ni-based single crystal superalloys
作者：Sun, Fei ;Zhang, Jianxin ;Liu, Pan ;Feng, Qiang ;Han, Xiaodong ;Mao, Shengcheng
作者机构：[Sun, Fei ;Zhang, Jianxin ] Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, Ch 更多
来源：Journal of Alloys and Compounds
摘要：By means of high resolution transmission electron microscopy (HRTEM) and high-angle annular dark-field image technique (HAADF), morphological of plate-shaped σ phase and interfacial characteristics between plate-shaped σ phase and γ phase in Ni-based single crystal superalloys have been studied. On the basis of HRTEM observations, an atomic structural interface between σ phase and γ phase with a step has been proposed. σ Phase has the relationship of [0 0 1]γ//[1 1 2¯]σ, (2¯ 2 0)γ//(1¯ 1 0)σ,(2¯2¯ 0)γ//(1 1 1)σ; [0 1 1]γ//[1 1 0]σ, (1 1¯ 1)γ//(0 0 1¯)σwith the γ phase. The compositional characteristics of the σ phase which are rich in more heavy elements, such as W, Re, Cr and Ru, has also been clearly revealed by the HAADF imaging technique and Energy Dispersive X-Ray Spectroscopy (EDS) mapping analysis. © 2012 Elsevier B.V. All rights reserved.