The mechanism of mixing and reactive diffusion in intermetallics (TiFe2, TiCr2)
The mechanism of mixing and reactive diffusion in intermetallics (TiFe2, TiCr2)
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金属间化合物（TiFe2、TiCr2）中的混合和反应扩散机制
DOI：
10.1080/01418617808239219
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发表时间：
1978
影响因子：
1.6
通讯作者：
S. Nadiv
中科院分区：
文献类型：
--
作者：
M. Wein;L. Levin;S. Nadiv
本文测定了TiFe_2、TiCr_2和Ti（Fe，Cr）中Laves相的扩散系数。分析了两种情况：（a）由于已经形成的金属间化合物中的浓度梯度而产生的扩散（“混合扩散”）和（B）在金属间化合物生长过程中的扩散（“反应扩散”）。在反应扩散中，扩散系数比混合扩散高约两个数量级。这些较高的扩散率归因于在移动的相变边界上形成并被困在新相中的过量空位。
Abstract Diffusivities in Laves phases in TiFe2, TiCr2 and Ti(Fe, Cr), have been obtained. Two cases have been analysed : (a) diffusion due to concentration gradients in the intermetallics already formed (‘mixing diffusion’) and (b) diffusion in the intermetallics in the course of their growth (‘reactive diffusion’). In reactive diffusion the diffusivities are about two orders higher than in mixing diffusion. These higher diffusivities are attributed to excess vacancies formed on the moving transformation boundary and trapped in the new phase.