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首页> 外文期刊>Intermetallics >Single-phase interdiffusion in the B2 type intermetallic compounds NiAl, CoAl and FeAl
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Single-phase interdiffusion in the B2 type intermetallic compounds NiAl, CoAl and FeAl

机译：B2型金属间化合物NiAl，CoAl和FeAl中的单相互扩散

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Interdiffusion coefficients, D, in the B2 type NiAl, CoAl and FeAl phases have been determined by single phase diffusion couples over a wide temperature range from 1073 to 1773 K. The value of D in the NiAl and CoAl phases shows a minimum at about 47 at. percent Al deviating slightly from the stoichiometric composition, while the value of D in the FeAl phase has a weak minimum at about 41 at. percent Al. The value of the activation energy, Q, for interdiffusion in the NiAl and CoAl phases shows a maximum at about 47 at. percent Al, where the value of Q in the CoAl phase is much higher than that in the NiAl phase, while the value of Q in the FeAl phase is nearly constant and much lower than those in the other two phases. It is observed that the larger the lattice constant of the compounds becomes, the lower the activation energy for diffusion in the compounds becomes. Thus, the magnitude of activation energy for diffusion in the B2 type NiAl, CoAl and FeAl is probably related to the lattice constant of the compounds. Using the interdiffusion coefficient and the tracer diffusion coefficients of Ni and Fe with the help of Darken's relation, the diffusion coefficient of Al in the NiAl and FeAl phases has been estimated.
机译：B2型NiAl，CoAl和FeAl相中的互扩散系数D已通过单相扩散偶在1073至1773 K的宽温度范围内确定。NiAl和CoAl相中的D值在约47处显示最小值在。 ％的Al略微偏离化学计量组成，而FeAl相中的D值在约41at处具有弱的最小值。铝百分比在NiAl和CoAl相中相互扩散的活化能Q值在约47at处显示最大值。百分比的铝，其中CoAl相中的Q值比NiAl相中的Q值高得多，而FeAl相中的Q值几乎恒定且远低于其他两个相。观察到，化合物的晶格常数变得越大，则在化合物中扩散的活化能变得越低。因此，在B2型NiAl，CoAl和FeAl中扩散的活化能的大小可能与化合物的晶格常数有关。利用镍和铁的互扩散系数以及示踪扩散系数，借助达肯关系，可以估算出铝在NiAl和FeAl相中的扩散系数。

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