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B2-FeAl 有序相中成分與溫度對占位與反位缺陷的影響: 相場法研究
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西北工業(yè)大學凝固技術國家重點實驗室

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中圖分類號:

TG151.1

基金項目:

國家自然科學基金項目（面上項目，重點項目，重大項目）


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

Fund Project:

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

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    摘要:

    原子占位與反位缺陷對金屬間化合物合金的物理與機械性能產生巨大的影響。B2-FeAl作為一種具有優(yōu)異性能的材料,研究其中的原子占位與反位缺陷具有十分重要的意義。本文利用相場方法研究了B2-FeAl有序相中鋁濃度與溫度對原子占位與反位缺陷變化趨勢的影響。研究結果表明,鋁濃度的增加或者溫度的降低能夠加速母相中的溶質原子分離,進而使得鋁原子占位、鐵原子占位以及反位鐵或鋁更早達到平衡態(tài)。特別地,鋁濃度的升高或溫度的降低能夠增強鋁和鐵的占位,并減少兩種類型的反位缺陷。此外,研究結果還表明鋁濃度或者溫度的變化不能改變B2-FeAl有序向中主要的反位缺陷類型。

    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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王錕,王永欣,胡石,陳錚,程巖峰. B2-FeAl 有序相中成分與溫度對占位與反位缺陷的影響: 相場法研究[J].稀有金屬材料與工程,2019,48(7):2112~2117.[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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  • 收稿日期:2018-01-24
  • 最后修改日期:2018-05-17
  • 錄用日期:2018-06-15
  • 在線發(fā)布日期: 2019-08-01
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