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The Effects of Composition and Temperature on Site Occupancies and Antisite Defects in B2-FeAl Ordered Phase: A Phase Field Study
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Affiliation:

1.State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an;2.Civil Aviation Safety Engi-neering Institute,Civil Aviation Flight University of China

Clc Number:

TG151.1

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Abstract:

    The site occupancies and antisite defects play important role in the physical and mechanical properties of intermetallic compound alloys. In this paper, the effects of Al concentration (cAl) and temperature (T) on the change trend of site occupancies and antisite defects in B2-FeAl, which has attractive properties, are investigated by phase field method. The numerical results show that the increase of cAl or the decrease of T can result in an acceleration of solute atoms segregation in matrix phase, and make site occupancies of Al and Fe as well as antisite Fe/Al reach equilibrium state earlier. Meanwhile, the increase of cAl or the decrease of T can enhance the site occupancies of Fe and Al and reduce the two types of antisite defects. Furthermore, the theoretical results show that the change of cAl and T is not able to change the main type of antisite defect in B2-FeAl ordered phase.

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[Kun Wang, Yongxin Wang, Shi Hu, Zheng Chen, Yanfeng Cheng. The Effects of Composition and Temperature on Site Occupancies and Antisite Defects in B2-FeAl Ordered Phase: A Phase Field Study[J]. Rare Metal Materials and Engineering,2019,48(7):2112~2117.]
DOI:10.12442/j. issn.1002-185X.20180090

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History
  • Received:January 24,2018
  • Revised:May 17,2018
  • Adopted:June 15,2018
  • Online: August 01,2019
  • Published: