| 钢铁材料晶界性质和冲击断裂特征的电子结构表征 |
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| 引用本文： | 章晓中,张丽娜,马钺,齐俊杰,袁俊.钢铁材料晶界性质和冲击断裂特征的电子结构表征[J].金属学报,2005,41(6):617-621. |
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| 作者姓名： | 章晓中 张丽娜 马钺 齐俊杰 袁俊 |
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| 作者单位： | 清华大学材料科学与工程系,北京,100084;清华大学材料科学与工程系,北京,100084;清华大学材料科学与工程系,北京,100084;清华大学材料科学与工程系,北京,100084;清华大学材料科学与工程系,北京,100084 |
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| 基金项目： | 国家自然科学基金资助项目50301007 |
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| 摘 要： | 采用电子能量损失谱(EELS)研究了不同商用钢铁材料的晶界，计算了晶界处和晶粒内铁原子的3d电子占据态密度，并将其和晶界性质以及材料的宏观断裂性能相联系．结果表明：当样品晶界处铁原子的3d电子占据态密度高于晶粒内时，晶界结合强度低于晶内，晶界表现出脆性，材料的冲击断裂方式主要为脆性的沿晶断裂；反之，如果晶界处铁原子的3d电子占有态密度与基体没有明显的差异，则晶界结合强度与晶内相当，晶界表现出韧性，材料的断裂方式主要为韧性的穿晶断裂．
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| 关 键 词： | 钢铁材料 电子结构 晶界 断裂模式 电子能量损失谱 |
| 文章编号： | 0412-1961(2005)06-0617-05 |
| 收稿时间： | 2004-09-13 |
| 修稿时间： | 2005-02-28 |
Electronic Structure Characterization of Bonding of Grain Boundaries and Fracture Mode of Steels |
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| Zhang Xiaozhong,Zhang Lina,MA Yue,Qi Junjie,YUAN Jun.Electronic Structure Characterization of Bonding of Grain Boundaries and Fracture Mode of Steels[J].Acta Metallurgica Sinica,2005,41(6):617-621. |
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| Authors: | Zhang Xiaozhong Zhang Lina MA Yue Qi Junjie YUAN Jun |
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| Affiliation: | Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 |
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| Abstract: | Electron energy loss spectroscopy (EELS) was used to study grain boundaries in steels. The normalized 3d occupancies of states of irons both in bulk and at grain boundary were calculated according to the EELS data which are related to the change in the bonding of grain boundaries and the fracture mode of the steels. It is found that if the grain boundary (GB) has a higher occupancy of 3d states of iron than that of the bulk, the sample has a weak bonding of GB and tends to intergranular fracture. Otherwise if the GB has almost the same occupancy of 3d state of iron as the bulk, the sample has a strong bonding of GB and tends to transgranular fracture. |
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| Keywords: | steel electronic structure grain boundary fracture mode EELS |
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