| Cu/Nb纳米金属多层膜延性及断裂行为的尺寸效应 |
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| 引用本文： | 张欣,张金钰,刘刚,张国君,孙军.Cu/Nb纳米金属多层膜延性及断裂行为的尺寸效应[J].金属学报,2011,47(2):246-250. |
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| 作者姓名： | 张欣 张金钰 刘刚 张国君 孙军 |
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| 作者单位： | 西安交通大学金属材料强度国家重点实验室, 西安 710049 |
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| 基金项目： | 国家重点基础研究规划项目2010CB631003和国家自然科学基金项目50971097资助 |
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| 摘 要： | 通过单轴拉伸实验并结合原位电阻测量法系统研究了恒定调制比下调制波长(λ=10-250 nm)对聚酰亚胺基体上Cu/Nb纳米金属多层膜延性和断裂韧性的影响.微观分析表明,Cu/Nb的调制结构清晰,不存在明显的互混现象.实验结果表明,随着调制波长的减小,多层膜的延性和断裂韧性均呈现非单调演变趋势,在调制波长为50 nm左右...
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| 关 键 词： | 纳米多层膜 调制波长 延性 断裂韧性 |
| 收稿时间： | 2010-08-13 |
| 修稿时间： | 2010-10-26 |
LENGTH SCALE DEPENDENT DUCTILITY AND FRACTURE BEHAVIOR OF Cu/Nb NANOSTRUCTURED METALLIC MULTILAYERS |
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| ZHANG Xin,ZHANG Jinyu,LIU Gang,ZHANG Guojun,SUN Jun State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an.LENGTH SCALE DEPENDENT DUCTILITY AND FRACTURE BEHAVIOR OF Cu/Nb NANOSTRUCTURED METALLIC MULTILAYERS[J].Acta Metallurgica Sinica,2011,47(2):246-250. |
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| Authors: | ZHANG Xin ZHANG Jinyu LIU Gang ZHANG Guojun SUN Jun State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an |
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| Affiliation: | State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049 |
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| Abstract: | By using uniaxial tensile test combining the $in~situ$ electrical resistance change method, the influence of modulation period with a wide range spanning from 10 to 250 nm on the ductility and fracture toughness of Cu/Nb nanostructured metallic multilayers on polyimide substrate was measured. The microstructural analysis revealed that the modulation structure of Cu/Nb metallic multilayers was clear and no intermixing between Cu and Nb was been found by using line scanning analysis. The experimental results indicated that both ductility and fracture toughness of the multilayer film exhibited a nonmonotonic change with decreasing modulation period, and reached maximum values at a critical modulation period of about 50 nm. This was attributed to the competing effect between the size of the microcracks initiated in the Nb layer and the role of the Cu layer in blocking crack propagation. This competing effect was qualitatively assessed on basis of fracture mechanics. |
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| Keywords: | nanostructured multilayers modulation period ductility fracture toughness |
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