| 稀土对材料强韧性的影响及细观机理探讨 |
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| 引用本文： | 周承恩,吴立新.稀土对材料强韧性的影响及细观机理探讨[J].内蒙古工业大学学报,1997,16(3):149-154. |
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| 作者姓名： | 周承恩 吴立新 |
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| 作者单位： | 内蒙古工业大学基础部!010062，呼和浩特(周承恩，梁竞冰，侯晓宁，文健)，武钢钢研所物理室!430080，武汉(吴立新) |
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| 基金项目： | 国家自然科学基金，国家教委留学回国人员基金 |
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| 摘 要： | 通过对钝切口小试样在扫描电镜下的加载观察与分析，认为稀土Ce能较大幅度地提高Al－Mg－Si变形铝合金的起裂COD值。细观分析表明，与平面应变断裂情况不同，稀土不是通过影响粒子形态进而对裂纹产生屏蔽效应来提高材料的宏观断裂性能，而主要是强化了晶界，迫使裂纹转向晶内并在裂尖产生较大的塑性变形，消耗更多的能量。
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| 关 键 词： | 稀土 变形铝合金 晶界 第二相 |
THE INFLUENCE OF RARE EARTH ELEMENT ON FRACTURE OF MATERIAL AND ITS MECHANISM |
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| Zhou Cheng''en, Liang Jingbing, Hou Xiaoning, Wen Jian.THE INFLUENCE OF RARE EARTH ELEMENT ON FRACTURE OF MATERIAL AND ITS MECHANISM[J].Journal of Inner Mongolia Polytechnic University(Social Sciences Edition),1997,16(3):149-154. |
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| Authors: | Zhou Cheng'en Liang Jingbing Hou Xiaoning Wen Jian |
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| Abstract: | Based on the observation of a notch specimen under loading by means f the SEM,a con-clusion is reached that rare earth element Ce can remarkably improve the cleavage COD valueof Al-Mg-Si deformed aluminum alloy. Mesostructure analysis shows that,under the planestrain condition, Ce changes the grain shape to improve the macro fracture performance,while,under the plane stress condition,Ce intensifies the crystal boundary,making cracks ex-tend into crystal. Thus,greater plastic deformation takes place at the crack tips and more en-ergy is dissipated. |
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| Keywords: | rare earth deformed aluminum alloy crystal boundaryh the second phase |
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