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AFM quantitative analysis and determination of shear angle of {259}f martensitic surface relief

Progress in Natural Science:Materials International 2002年第10期 48-53页

作者： LIN Xiaoping, GU Nanju, ZHANG Yong, MENG Zhaowei and MA Xiaoli(Department of Materials Science and Technology, Hebei University of Technology, Tianjin 300130, China) Department of Materials Science and Technology Hebei University of Technology Tianjin 300130 China

An attentive observation and quantitative analysis of {259}f martensitic surface relief in an Fe-23Ni-0. 55C alloy are made by means of an atomic force microscope (AFM), and different martensitic variants’ shear angles are determined in this paper. The experiments show that {259}f martensitic surface relief exhibits regular shape in many cases, which is in agreement with the prediction of invariant plane strain (IPS). Generally, {259}f martensitic surface relief appears to be " N"-shaped, but it is tent-shaped in the case of zigzag-shaped martensite. The compressed deformation of parent phase diminishes the surface relief in size but with little change of its relief angle. {259}f martensitic surface relief, large or small, has approximately the same relief angles, exhibiting a good "self-similar fractal". The determined values of different {259}f martensitic variants’ shear angles are in fine agreement with the prediction of Wechsler-Liberman-Read (W-L-R) theory, with only a slight difference of less th

关键词： atomic force microscope (AFM) surface relief invariant plane strain (IPS) relief angle shear angle.

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CRYSTALLOGRAPHIC ANALYSIS OF THE LATH MARTENSITE TRANSFORMATION IN Fe-Ni-Mn ALLOY

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Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 862-869页

作者： X.P.Lin Y.Dong X.M.Cao Y.Zhang N.J.Gu X.L.Ma DepartmentofMaterialsScienceandTechnology HebeiUniversityofTechnologyTianjin300130ChinaManuscriptreceived18November2003 inrevisedform1June2004

Habit plane rotation of lath martensite transformation in Fe-Ni-Mn alloy was predicted by means of Displacement Vector Theory. Its surface relief effect was observed and a math model for the quantitative analysis of habit plane rotation of lath martensite transformation was established by means of atomic force microscopy (AFM). The experiment showed that the largest rotation of habit plane of lath martensite transformation predicted by means of Displacement Vector Theory is 13.50°, and it's incompatible with the concept of invariant plane strain (IPS); surface relief of lath martensite revealed no character of IPS, i.e. it exhibited irregular 'N'-shaped 'surface relief packet', and 'surface relief packet' was composed of layers of several small surface reliefs, the AFM quantitative analysis of habit plane rotation of lath martensite transformation was 11.11°, which was in agreement with the prediction of Displacement Vector Theory (13.50°) and it firmly confirmed the habit plane rotation of lath martensite transformation and the correctness of Displacement Vector Theory.

关键词： atomic force microscope (AFM) surface relief invariant plane strain (IPS) relief angle shear angle

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