| 钛基二元纳米合金形成焓的尺寸效应 |
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| 引用本文： | 吕云宾,廖树帜.钛基二元纳米合金形成焓的尺寸效应[J].南华大学学报(自然科学版),2011,25(4):85-90. |
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| 作者姓名： | 吕云宾 廖树帜 |
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| 作者单位： | 南华大学数理学院;湖南师范大学教育部低维量子结构与调控重点实验室 |
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| 基金项目： | 湖南省科技厅科研基金资助项目(2009FJ3153) |
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| 摘 要： | 基于计算合金形成焓的改进Miedema模型和考虑纳米颗粒表面效应,研究了钛基二元纳米合金形成焓的尺寸和成分效应.计算结果表明钛基二元合金纳米颗粒的形成焓依赖颗粒尺寸,显示了明显的尺寸效应.纳米颗粒的形成焓随粒径的减小而增大,当粒径减小到某一临界尺寸时,纳米合金的形成焓由负值转变为正值,从而降低了纳米颗粒的热稳定性.当颗粒粒径小于10 nm时,纳米颗粒发生成分聚集,这种成分聚集发生的趋势取决于纳米合金的表面形成焓.
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| 关 键 词： | 改进Miedema模型 纳米颗粒 钛基合金 形成焓 尺寸依赖性 成分聚集 |
| 收稿时间： | 2011/11/1 0:00:00 |
The Size-effect on the Formation Enthalpy of Nano-sized Binary Ti Based Alloy |
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| LV Yun-bin,LIAO Shu-zhi.The Size-effect on the Formation Enthalpy of Nano-sized Binary Ti Based Alloy[J].Journal of Nanhua University:Science and Technology,2011,25(4):85-90. |
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| Authors: | LV Yun-bin LIAO Shu-zhi |
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| Institution: | 1.School of Mathematics and Physics,University of South China,Hengyang,Hunan 421001,China; 2.Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education,Hunan Normal University,Changsha,Hunan 410081,China) |
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| Abstract: | The effects of grain size and composition on the formation enthalpy of nano binary Ti-based alloy are investigated by taking the surface effect into account within the modified Miedema model.It is demonstrated that the formation enthalpy of binary Ti based alloy with nano grains is size-dependent and exhibits evident size-effects.The formation enthalpy increases with the size decrease,and its value turns from negative to positive at a critical size,which will weaken the thermal stability of the nano grains.Furthermore,the composition segregation taking place in the nano grains of the Ti based alloy is obvious when the grain size is less than 10 nm and the tendency of segregation is dependent on the surface formation enthalpy of nanoparticle. |
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| Keywords: | modified miedema model nano particle Ti based alloy formation enthalpy size-dependence composition segregation |
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