| 引用本文： |
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王戎丞,陶小马,欧阳义芳.铝含量对B2铁铝空位浓度和硬度的影响[J].广西科学,2017,24(6):568-572. [点击复制]
- WANG Rongcheng,TAO Xiaoma,OUYANG Yifang.The Effect of Al Composition on Vacancy Concentration and Hardness for B2-FeAl[J].Guangxi Sciences,2017,24(6):568-572. [点击复制]
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| 摘要: |
| [目的]铁铝合金在高温结构材料、加热元件等方面有广泛的应用,对其强化和韧化机理的研究对设计和开发新型铁铝基高温合金具有重要意义。[方法]采用真空熔炼方法制备不同铝含量的铁铝合金,经过不同的退火温度热处理后,用XRD方法测量其晶格常数,确定其X射线密度,采用阿基米德法测量其体密度,从而确定其空位浓度;用显微硬度计测量其硬度。[结果]空位浓度随着铝含量的增加而增加,随热处理温度的升高合金中空位浓度增加;显微硬度随铝含量的增加或热处理温度的升高而增大。[结论]随着铝含量的增加,空位形成能下降,空位浓度增加;随着热处理温度的升高,合金中空位浓度增大;合金显微硬度增大主要是由于空位浓度增加对位错的阻碍作用增强所致。显微硬度与空位浓度的关系可近似表示为HV=1.922+2.179CVac1/2。 |
| 关键词: 金属间化合物 力学性能 点缺陷 |
| DOI：10.13656/j.cnki.gxkx.20171219.008 |
| 投稿时间：2017-05-10修订日期：2017-06-08 |
| 基金项目:国家自然科学基金项目(11464001,51061004,51531009)和广西自然科学基金项目(2014GXNSFAA118308)资助。 |
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| The Effect of Al Composition on Vacancy Concentration and Hardness for B2-FeAl |
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WANG Rongcheng1,2, TAO Xiaoma2, OUYANG Yifang1,2
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| (1.School of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong, 510640, China;2.Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, College of Physics Science and Engineering, Guangxi University, Nanning, Guangxi, 530004, China) |
| Abstract: |
| [Objective] B2-FeAl has a wide range of applications in heating elements and high temperature structural materials. The studies for mechanism of strengthening and malleablizing of B2-FeAl are of great significance for the design and development of B2-FeAl-based superalloy.[Methods] The vacancy concentration in B2-Fe1-xAlx(x=0.40-0.51) has been experimentally determined as function of Al composition and quenching temperatures ranging from 773 K to 1 173 K by XRD and measurement of bulk density. The hardness of the B2-Fe1-xAlx alloys has also been measured by micro-hardness tester.[Results] The vacancy concentration increases with the increase of Al content and annealing temperature. The micro-hardness also increases with increasing Al content and annealing temperature.[Conclusions] With the increase of Al content, the formation energies of vacancy decrease and the concentration of vacancy increases.With the increase of the heat treatment temperature, the concentration of vacancies in the alloy increases.The increase of the micro-hardness of the alloy is mainly due to the increased inhibition of the dislocation caused by the increase of the vacancy concentration. The quantitative relationship between the micro-hardness and vacancy concentration can be approximated as HV=1.922+2.179CVac1/2. |
| Key words: intermetallics mechanical properties point defect |
