1.引言半导体结构和器件在制造和使用过程中引入的热应力、晶格失配应力等可诱发晶体缺陷形核、改变能隙,降低器件的发光效率和灵敏度。由于激光器、发光二级管等光电子器件的外延层厚度仅为几纳米~几十纳米,采用 X 射线衍射(XRD)和...
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1.引言半导体结构和器件在制造和使用过程中引入的热应力、晶格失配应力等可诱发晶体缺陷形核、改变能隙,降低器件的发光效率和灵敏度。由于激光器、发光二级管等光电子器件的外延层厚度仅为几纳米~几十纳米,采用 X 射线衍射(XRD)和同步辐射等技术虽具有高的应变敏感性,但难以得到微区应力和应变信息。会聚束电子衍射(CBED)有很高的空间分辨率和较高的
SiC 纤维增强 Ti 基复合材料(SiC_f/Ti)在航空航天领域有重要应用前景,但在增强体 SiC 纤维和基体 Ti 合金之间存在着严重的界面反应,界面反应对 SiC_f/Ti 基复合材料的界面结合强度产生作用,从而影响复合材料的宏观力学性能。本文采...
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SiC 纤维增强 Ti 基复合材料(SiC_f/Ti)在航空航天领域有重要应用前景,但在增强体 SiC 纤维和基体 Ti 合金之间存在着严重的界面反应,界面反应对 SiC_f/Ti 基复合材料的界面结合强度产生作用,从而影响复合材料的宏观力学性能。本文采用电子显微镜研究了 SiC_f/Ti 基复合材料的界面反应,采用纤维顶出法测定了界面结合强度,发现在纤维的碳涂层和基体钛合金之间形成界面反应产物 TiC,随着界面反应的加剧,界面结合强度增加, 实验结果可以用剪滞理论进行解释。
Electron backscattering diffraction(ebsd)technique is finding more and more applications in characterizing the microstructure features of both structural and functional materials based on the accurate determination ...
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Electron backscattering diffraction(ebsd)technique is finding more and more applications in characterizing the microstructure features of both structural and functional materials based on the accurate determination of spatial crystalline *** compared with the traditional microstructure analysis methods,e.g.X-ray diffraction(XRD)and transmission electron microscopy(TEM),ebsd makes it possible to quantitatively evaluate many microstructure features,such as grain size,grain boundary characters,texture,as well as interior grain misorientations,in an area ranging from 100μm to *** technique,in combination with scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS),is becoming a common and powerful tool for distribution characterization of composition,crystallographic orientation,interfaces and even strain state features in many kinds of *** the present paper, several topics on the application of ebsd technique investigated in NIMS are to be introduced, that include 1)spatial grain size and grain size distribution measurement with ebsd technique,2) quantitative characterization of grain size and grain boundary features in an ultrafine grained low-carbon steel and 3)Twin boundary characterization of Mn-Cu high damping alloys.
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