| 铈对Al-Li合金断裂方式影响的半定量研究 |
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| 引用本文： | 王永欣,陈铮,徐磊,刘兵.铈对Al-Li合金断裂方式影响的半定量研究[J].中国稀土学报,2004,22(3):369-374. |
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| 作者姓名： | 王永欣 陈铮 徐磊 刘兵 |
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| 作者单位： | 西北工业大学材料学院,陕西,西安,710072 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划)，西北工业大学校科研和教改项目 |
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| 摘 要： | 以2090合金和2090 Ce合金为研究对象, 对两合金不同时效时间的室温拉伸断口进行了半定量分析, 探讨了拉伸性能对断裂特征的响应关系, 并进一步分析了Ce的作用. 研究表明: 2090合金与2090 Ce合金的断裂方式均以韧窝、分层开裂和沿亚晶界开裂3种方式为主, 随时效时间的延长, 韧窝减少; 分层先增加, 后减少; 沿亚晶界开裂比例逐渐加大. 2090 Ce合金的韧窝比例较2090合金的大, 沿亚晶界开裂比例少, 分层开裂始终为主要断裂机制. 分层开裂倾向与时效程度有密切关系. Ce通过净化合金, 强化晶界, 抑制共面滑移达到增塑作用. 但其对抑制共面滑移有双重影响, 使其增塑效应随时效程度不同而异. 欠时效和过时效状态增塑作用较弱, 峰值时效状态作用明显.
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| 关 键 词： | 金属材料 铝锂合金 断裂方式 半定量 稀土 |
| 文章编号： | 1000-4343(2004)02-0369-06 |
| 修稿时间： | 2003年9月5日 |
A Semi-Quantitative Study of Influence of Cerium on Fracture Mechanisms of Al-Li Alloys |
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| Abstract: | The fracture mechanism of two aluminum-lithium alloys, 2090 and 2090 Ce aged for different time were comparatively studied by semi-quantitative method. The effects of Ce on fracture mechanisms and properties were discussed. Statistical and analytical results show that the main fracture features are dimples, short-transverse delamination and crack along subgrain boundaries. The percent of dimples decreases, the percent of crack along subgrain boundaries increases and the short-transverse delamination increase firstly and then decreases with the aging time. There is close relationship between aging time and short-transverse delamination tendency. A significant improvement in ductility by adding Ce depends on the degree of aging. In under-aged and over-aged condition, the improving effect is weaker than that in peak-aged condition. |
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| Keywords: | Al-Li alloys Cerium fracture mechanisms semi-quantitative method rare earths |
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