Defect parameters of b.c.c. metals: group-specific trends
Defect parameters of b.c.c. metals: group-specific trends
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DOI：
10.1016/0921-5093(91)90766-g
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发表时间：
1991-08
期刊：
影响因子：
6.4
通讯作者：
H. Schultz
中科院分区：
文献类型：
--
作者：
H. Schultz
总结了扭结模型中原子缺陷（点缺陷）的缺陷参数和位错的性质。对于点缺陷性质的评价，作者采用了第三阶段恢复的空位解释。所收集的缺陷参数显示出明显的组特定的趋势取决于电子原子比。空位和螺型位错的迁移率与弹性性质有关。这适用于碱金属和过渡金属。参考最近的理论和实验工作的其他作者，它已被证明，与d状态的填充，特征声子异常，相稳定性以及“异常自扩散”的钛族金属的结合力的变化是强烈相关的。提出了铁磁性铁中空位组态的建议，解决了明显的不一致性。自填隙原子的结果更难以评估。在碱金属和第5族金属中，甚至在接近4 K时，也观察到了显著的长程迁移。对于第6族金属，低温回复可以通过自间隙原子的平面迁移来解释。简要概述了特定于组的缺陷特性对难熔金属加工的影响。
Defect parameters of atomic defects (“point defects”) and properties of dislocations as expressed in the kink model are summarized. For the evaluation of point defect properties the author adopts the vacancy interpretation of stage III recovery. The collected defect parameters show pronounced group-specific trends depending upon the electron-to-atom ratio. The mobility of vacancies as well as of screw dislocations can be correlated with the elastic properties. This holds for both alkali and transition metals. Reference is made to recent theoretical and experimental work of other authors, where it has been shown that the variation of binding forces with the filling of d states, characteristic phonon anomalies, phase stability as well as the “anomalous self-diffusion” in the titanium group metals are strongly interrelated. A suggestion is made for the vacancy configuration in ferromagnetic iron which could resolve apparent inconsistencies. Results for self-interstitial atoms are more difficult to evaluate. The observation of long-range migration, even near 4 K, in alkali and group 5 metals is remarkable. For group 6 metals the low temperature recovery can be explained by planar migration of the self-interstitial atom. The impact of group-specific defect properties for the processing of refractory metals is outlined briefly.