ON THE ANOMALOUS SELF-DIFFUSION IN BCC TITANIUM
ON THE ANOMALOUS SELF-DIFFUSION IN BCC TITANIUM
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DOI：
10.1002/pssb.2221440122
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发表时间：
1987-11-01
期刊：
影响因子：
--
通讯作者：
HERZIG, C
中科院分区：
文献类型：
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作者：
KOHLER, U;HERZIG, C
在超高真空条件下，在b.c.c.存在的整个范围内，测量了β-Ti中44 Ti的自扩散。相位阿克里尼乌斯图显示了与默多克等人之前的研究一致的强烈向上曲率。异常扩散行为与实验观察到的LA声子模软化有关<111>，并由具有温度依赖性迁移焓的单空位机制解释。当分离的声子相关的扩散贡献的分析产生的频率因子和激活焓符合正常的空位扩散参数。
Self‐diffusion of44Ti is measured in β‐Ti under UHV conditions in the whole range of existence of the b.c.c. phase. The Arrhenius plot shows a strong upward curvature in agreement with previous investigations of Murdock et al. The anomalous diffusion behaviour is related to the experimentally observed softening of the LA ⅔<111> phonon mode and is explained by a monovacancy mechanism with a temperature‐dependent migration enthalpy. When separating the phonon related diffusion contribution the analysis yields a frequency factor and an activation enthalpy consistent with normal vacancy diffusion parameters.