锰基高温反铁磁形状记忆合金中马氏体逆相变的表面浮突研究
发布时间：2018-11-11 14:28
【摘要】：本文利用原子力显微镜原位研究Mn79.5Fe15.6Cu4.9反铁磁高温形状记忆合金在升降温过程中与马氏体相变相关的表面起伏特征,同时采用X射线衍射、动态热机械分析等实验检测手段辅助分析其微观组织结构演化,从纳米尺度分析面心立方—面心四方结构相变及表面浮突产生的物理机理.实验结果表明:在升降温过程中观察到帐篷型表面浮突,由面心立方—面心四方马氏体逆相变产生的,即母相浮突,这与通常观测到的马氏体浮突不同;实验证实面心立方—面心四方马氏体逆相变具有切变特征,马氏体孪晶的逆向切变是产生帐篷型表面浮突的主要机理;测得逆孪晶切变的浮突角小于1?,远小于传统形状记忆合金的表面浮突角值,这是由于面心立方母相与面心四方马氏体相结构差异较小造成的;表面浮突随温度变化具有极好的可逆性,这是马氏体相变晶体学可逆性决定的,表明该合金具有优良的表面形貌记忆效应.
[Abstract]:In this paper, the surface fluctuation characteristics of Mn79.5Fe15.6Cu4.9 antiferromagnetic high temperature shape memory alloy associated with martensite transformation are studied in situ by atomic force microscope (AFM). At the same time, X-ray diffraction is used. Dynamic thermo-mechanical analysis and other experimental methods are used to analyze the microstructure evolution. The physical mechanism of the phase transition and surface floatation is analyzed from the nanometer scale. The experimental results show that the tent surface floatation is caused by the inverse transformation of face-centered cubic tetragonal martensite, that is, the parent phase floatation, which is different from the usual observed martensite floatation. Experimental results show that the inverse transformation of face-centered cubic tetragonal martensite has shear characteristics, and the reverse shear of martensite twin is the main mechanism for the formation of tent surface floatation. It is found that the floating angle of inverse twin shear is less than 1g, which is much smaller than the surface floatation angle of the traditional shape memory alloy, which is due to the small difference between the face-centered cubic parent phase and the face-centered tetragonal martensite phase. The surface floatation has excellent reversibility with temperature, which is determined by the crystallographic reversibility of martensite transformation, which indicates that the alloy has excellent surface morphology memory effect.
【作者单位】： 上海交通大学材料科学与工程学院;
【基金】：国家自然科学基金(批准号:51171112) 国家重点基础研究发展计划(973项目)(批准号:2012CB619400) 教育部国家级大学生创新创业训练计划项目(批准号:201310248037)资助的课题~~
【分类号】：TG139.6
本文编号：2325118
[Abstract]:In this paper, the surface fluctuation characteristics of Mn79.5Fe15.6Cu4.9 antiferromagnetic high temperature shape memory alloy associated with martensite transformation are studied in situ by atomic force microscope (AFM). At the same time, X-ray diffraction is used. Dynamic thermo-mechanical analysis and other experimental methods are used to analyze the microstructure evolution. The physical mechanism of the phase transition and surface floatation is analyzed from the nanometer scale. The experimental results show that the tent surface floatation is caused by the inverse transformation of face-centered cubic tetragonal martensite, that is, the parent phase floatation, which is different from the usual observed martensite floatation. Experimental results show that the inverse transformation of face-centered cubic tetragonal martensite has shear characteristics, and the reverse shear of martensite twin is the main mechanism for the formation of tent surface floatation. It is found that the floating angle of inverse twin shear is less than 1g, which is much smaller than the surface floatation angle of the traditional shape memory alloy, which is due to the small difference between the face-centered cubic parent phase and the face-centered tetragonal martensite phase. The surface floatation has excellent reversibility with temperature, which is determined by the crystallographic reversibility of martensite transformation, which indicates that the alloy has excellent surface morphology memory effect.
【作者单位】： 上海交通大学材料科学与工程学院;
【基金】：国家自然科学基金(批准号:51171112) 国家重点基础研究发展计划(973项目)(批准号:2012CB619400) 教育部国家级大学生创新创业训练计划项目(批准号:201310248037)资助的课题~~
【分类号】：TG139.6
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