| TC17钛合金自表面纳米化机制及组织演化 |
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| 引用本文： | 赵 坤,王 敏,蔺成效,拓 川.TC17钛合金自表面纳米化机制及组织演化[J].稀有金属材料与工程,2013,42(8):2048-2052. |
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| 作者姓名： | 赵 坤 王 敏 蔺成效 拓 川 |
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| 作者单位： | 西北工业大学凝固技术国家重点实验室,陕西西安,710072 |
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| 基金项目： | 国家自然科学基金，西北工业大学基础研究基金 |
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| 摘 要： | 采用二元合金晶体相场模型,耦合原子密度场和浓度场,在扩散时间尺度上模拟过冷熔体的形核,生长及粗化过程.研究表明:增加冷却速率,模拟区域内晶核富集,快速长大；一定范围内,随着冷却速率增大,晶粒尺寸减小,组织细化；晶粒长大过程中,晶界主要依靠位错的迁移或攀移进行运动.二元合金模拟还可以应用到枝晶凝固、外延生长,调幅分解中,前景广阔.
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| 关 键 词： | 晶体相场 二元合金 晶体生长 冷却速率 |
| 收稿时间： | 2012/10/28 0:00:00 |
Mechanism and Nanostructure Evolution of Surface Self-Nanocrystallization of TC17 |
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| Zhao Kun,Wang Min,Lin Chengxiao and Tuo Chuan.Mechanism and Nanostructure Evolution of Surface Self-Nanocrystallization of TC17[J].Rare Metal Materials and Engineering,2013,42(8):2048-2052. |
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| Authors: | Zhao Kun Wang Min Lin Chengxiao and Tuo Chuan |
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| Affiliation: | Modeling Growth of Binary Alloys Using Phase Field Crystal |
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| Abstract: | A phase field crystal model of binary alloy crystallization was derived by an advanced operator splitting technique. It was shown to simultaneously model nucleation, grain growth and coarsening of undercooling liquid on diffusive time scales. Simulated results demonstrate that the undercooling rate has a significant influence on the nucleation and grain morphology. Nucleation gathers and grows fast in the simulation box at higher undercooling rate; within a certain ranges the size of grains is decreased and the microstructure refined with the increasing undercooling rate. The motion of grain boundary depends on the migration and climbing of dislocation. The PFC alloy model is a promising method which can also be used to simulate dendritic solidification, epitaxial growth and spinodal decomposition. |
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| Keywords: | phase field crystal binary alloys crystal growth undercooling rate |
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