Relative strength of phase stabilizers in titanium alloys
文献类型：期刊论文
| 作者 | B. E. Tegner ; L. G. Zhu ; G. J. Ackland |
| 刊名 | Physical Review B
 |
| 出版日期 | 2012 |
| 卷号 | 85期号:21 |
| 关键词 | crystal-structures structure maps approximation metals zr ti hf |
| ISSN号 | 1098-0121 |
| 中文摘要 | Titanium alloys exhibit three distinct crystal structures: alpha, beta, and omega. For various applications alloying elements can be used to stabilize the desired phase. Extensive data exist to determine the thermodynamic equilibrium phase, typically phase coexistence. However, the normal state of commercial alloys is a quenched solid solution. While alloy designers have well-established rules of thumb, rigorous theory for nonequilibrium single-phase crystal stability is less well established. We develop a theory to predict which phase a particular alloy will adopt, as a function of minor element concentration. We use two different methods based on density functional theory with pseudopotentials and plane waves, with either explicit atoms or the virtual crystal approximation (VCA). The former is highly reliable, while the latter makes a number of drastic assumptions that typically lead to poor results. Surprisingly, the agreement between the methods is good, showing that the approximations in the VCA are not important in determining the phase stability and elastic properties. This allows us to generalize, showing that the single-phase stability can be related linearly to the number of d electrons, independent of the actual alloying elements or details of their atomistic-level arrangement. This leads to a quantitative measure of beta stabilization for each alloying transition metal. |
| 原文出处 | |
| 公开日期 | 2013-02-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/60262]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | B. E. Tegner,L. G. Zhu,G. J. Ackland. Relative strength of phase stabilizers in titanium alloys[J]. Physical Review B,2012,85(21). |
| APA | B. E. Tegner,L. G. Zhu,&G. J. Ackland.(2012).Relative strength of phase stabilizers in titanium alloys.Physical Review B,85(21). |
| MLA | B. E. Tegner,et al."Relative strength of phase stabilizers in titanium alloys".Physical Review B 85.21(2012). |
入库方式： OAI收割
来源：金属研究所
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