利用3D EBSD-FIB(three dimensional electron backscatter diffraction-focused ion beam)技术,以高锰钢为实验材料,构建晶粒三维立体形貌,并对马氏体惯习面进行观察分析。结果表明:热致板条状马氏体表面平直,接近马氏体的{110}α,惯...利用3D EBSD-FIB(three dimensional electron backscatter diffraction-focused ion beam)技术,以高锰钢为实验材料,构建晶粒三维立体形貌,并对马氏体惯习面进行观察分析。结果表明:热致板条状马氏体表面平直,接近马氏体的{110}α,惯习面平行于奥氏体的{225}γ,其初始形核及后期生长均在{225}γ上进行;而形变诱发形成的板条状马氏体表面和惯习面分布近于{021}α和{225}γ,初始形核和前期生长沿{225}γ,后期生长沿{111}γ,由于外加应力,其表面发生弯曲变形,形核时间不同,偏离{225}γ-{111}γ程度不同。展开更多
使用连续截面法结合三维电子背散射衍射(three-dimensional electron backscatter diffraction,3D-EBSD)方法对316L不锈钢的晶界进行三维重构,并采用平面近似度定量描述了晶界的形貌特征,从三维尺度研究了晶界工程处理对316L不锈钢晶界...使用连续截面法结合三维电子背散射衍射(three-dimensional electron backscatter diffraction,3D-EBSD)方法对316L不锈钢的晶界进行三维重构,并采用平面近似度定量描述了晶界的形貌特征,从三维尺度研究了晶界工程处理对316L不锈钢晶界形貌的影响。结果表明:使用平面近似度可以区分简单平面状和复杂曲面状晶界。316L不锈钢中孪晶界与其余晶界的平面近似度均符合Gamma分布。晶界工程处理的316L不锈钢中晶界的平面近似度整体下降,表明晶界工程处理促进了更多复杂曲面状晶界的形成。展开更多
Electron backscatter diffraction(EBSD) is a superior technique for twin characterisation due to its ability to provide highly detailed classification(by generation,system and variant) of a significant number of twins ...Electron backscatter diffraction(EBSD) is a superior technique for twin characterisation due to its ability to provide highly detailed classification(by generation,system and variant) of a significant number of twins in a relatively short time.2D EBSD is now widely used for twin characterisation and provides quite good estimates of twin volume fractions under many conditions.Nevertheless,its accuracy is limited by assumptions that have to be made due to the 2D nature of the technique.With 3D EBSD,two key assumptions are no longer required,as additional information can be derived from the 3D map.This paper compares the benefits and limitations of 2D and 3D EBSD for twin characterisation.2D EBSD enables a larger number of twins to be mapped in a given space of time,giving better statistics.3D EBSD provides more comprehensive twin characterisation and will be a valuable tool for validation of 2D stereological methods and microstructural models of twinning during deformation.展开更多
文摘利用3D EBSD-FIB(three dimensional electron backscatter diffraction-focused ion beam)技术,以高锰钢为实验材料,构建晶粒三维立体形貌,并对马氏体惯习面进行观察分析。结果表明:热致板条状马氏体表面平直,接近马氏体的{110}α,惯习面平行于奥氏体的{225}γ,其初始形核及后期生长均在{225}γ上进行;而形变诱发形成的板条状马氏体表面和惯习面分布近于{021}α和{225}γ,初始形核和前期生长沿{225}γ,后期生长沿{111}γ,由于外加应力,其表面发生弯曲变形,形核时间不同,偏离{225}γ-{111}γ程度不同。
文摘使用连续截面法结合三维电子背散射衍射(three-dimensional electron backscatter diffraction,3D-EBSD)方法对316L不锈钢的晶界进行三维重构,并采用平面近似度定量描述了晶界的形貌特征,从三维尺度研究了晶界工程处理对316L不锈钢晶界形貌的影响。结果表明:使用平面近似度可以区分简单平面状和复杂曲面状晶界。316L不锈钢中孪晶界与其余晶界的平面近似度均符合Gamma分布。晶界工程处理的316L不锈钢中晶界的平面近似度整体下降,表明晶界工程处理促进了更多复杂曲面状晶界的形成。
文摘Electron backscatter diffraction(EBSD) is a superior technique for twin characterisation due to its ability to provide highly detailed classification(by generation,system and variant) of a significant number of twins in a relatively short time.2D EBSD is now widely used for twin characterisation and provides quite good estimates of twin volume fractions under many conditions.Nevertheless,its accuracy is limited by assumptions that have to be made due to the 2D nature of the technique.With 3D EBSD,two key assumptions are no longer required,as additional information can be derived from the 3D map.This paper compares the benefits and limitations of 2D and 3D EBSD for twin characterisation.2D EBSD enables a larger number of twins to be mapped in a given space of time,giving better statistics.3D EBSD provides more comprehensive twin characterisation and will be a valuable tool for validation of 2D stereological methods and microstructural models of twinning during deformation.
