| 加载速率对Al-Li合金断裂韧性的影响 |
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| 引用本文： | 李桂红,燕东明,赵锦云,陈伟.加载速率对Al-Li合金断裂韧性的影响[J].兵器材料科学与工程,2001,24(1):49-52. |
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| 作者姓名： | 李桂红 燕东明 赵锦云 陈伟 |
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| 作者单位： | 1. 南京理工大学
2. 兵器工业第五二研究所 |
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| 摘 要： | 铝锂合金具有低密度、高弹性模量等优点 ,但其韧性较差 ,研究了加载速率对 Al- L i- Cu- Mg- Zr合金断裂韧性的影响。通过准静态与动态三点弯曲实验分别测定了材料的断裂韧性 ,实验发现动态下的断裂韧性较之准静态有了提高 ,断口观察表明动态断口出现了大量长而深的分层 ,透射、扫描电镜进一步分析认为分层开裂形式是导致断裂韧性提高的主要原因。
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| 关 键 词： | 铝理合金 加载速率 断裂韧性 分层开裂 |
| 文章编号： | 1004-244X(2001)01-0049-04 |
| 修稿时间： | 2000年8月20日 |
INFLUENCE OF LOADING RATE ON Al-Li ALLOY FRACTURE TOUGHNESS |
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| Li Guihong,School of Manufacturing Engineering,Nanjing University of Science &Technology,Nanjing ,Yan Dongming,Zhao Jinyun.INFLUENCE OF LOADING RATE ON Al-Li ALLOY FRACTURE TOUGHNESS[J].Ordnance Material Science and Engineering,2001,24(1):49-52. |
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| Authors: | Li Guihong School of Manufacturing Engineering Nanjing University of Science &Technology Nanjing Yan Dongming Zhao Jinyun |
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| Affiliation: | Li Guihong,School of Manufacturing Engineering,Nanjing University of Science &Technology,Nanjing 210094,Yan Dongming,Zhao Jinyun |
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| Abstract: | AlLi alloys has the advantages of low density and high modulus,but its tenacity is bad.The effect of loading rate on the fracture toughness of AlLiCuMgZr allogy was studied.The fracture toughness of the alloy was measured by means of the quasistatic and dynamic threepoint bending testing, respectively.The results show that the dynamic fracture toughness of the alloy is superior to the quasistatic fracture toughness of it.The microscopic observations of the fractured surface show that the dynamic fractured surface has a great deal of long and deep delaminations.The further analysis by means of TEMand SEM shows that the delamination and split-up of the alloy are the main cause of the fracture toughness increasing. |
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| Keywords: | AlLi alloy loading rate fracture toughness delamination splitting |
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