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首页> 外文会议>Symposium Proceedings vol.842; Symposium on Integrative and Interdisciplinary Aspects of Intermetallics; 20041129-1201; Boston,MA(US) >Thermal Analysis of Relaxation Processes of Supersaturated Vacancies in B2-Type Aluminides
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Thermal Analysis of Relaxation Processes of Supersaturated Vacancies in B2-Type Aluminides

机译：B2型铝化物中过饱和空位弛豫过程的热分析

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摘要

Relaxation behavior of supersaturated vacancies in water-quenched and rapidly solidified B2 type CoAl and NiAl with the stoichiometric composition was studied by differential scanning calorimetry (DSC). In both CoAl and NiAl quenched from 1773 K, a single exothermic peak due mainly to the recovery of supersaturated vacancies appeared near 950 K. On the other hand, the exothermic peak was also observed in as-spun rapidly solidified CoAl and NiAl ribbons, and the temperature range of the peak was much broader than that of quenched-in bulks, suggesting that the peak in the rapidly solidified ribbons results from not only a single recovery process of vacancies but also those of some other lattice defects. TEM observation showed that a large amount of dislocations were introduced in the NiAl ribbon and that comparatively many voids as well as an amount of dislocations were introduced in the CoAl ribbon.
机译：通过差示扫描量热法（DSC）研究了水冷快速凝固的B2型CoAl和NiAl化学计量组成的过饱和空位的弛豫行为。在从1773 K开始淬火的CoAl和NiAl中，一个主要由过饱和空位恢复引起的放热峰出现在950 K附近。另一方面，在初生快速凝固的CoAl和NiAl带中也观察到放热峰。峰的温度范围比淬火块的温度范围宽得多，这表明快速凝固的薄带中的峰不仅是由于空位的单一恢复过程引起的，而且还归因于一些其他晶格缺陷的产生。 TEM观察表明，在NiAl带中引入了大量的位错，并且在CoAl带中引入了相对较多的空隙以及一定量的位错。

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