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CrFeMnVCu系高熵合金的微觀組織和性能
作者:
作者單位:

1.北京機(jī)電工程總體設(shè)計部;2.北礦檢測技術(shù)有限公司

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基金項目:

國家高技術(shù)研究發(fā)展計劃（863計劃），2012AA03A513


Microstructure and Mechanical Properties of CrFeMnVCu High Entropy Alloys
Author:
Affiliation:

1.Beijing System Design Institute of Electro Mechanic Engineering;2.Bgrimm MTC Technology Co., Ltd

Fund Project:

National High Technology Research and Development Program 863, 2012AA03A513

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    摘要:

    本文在CrMnFeV四元合金的基礎(chǔ)上添加奧氏體形成元素Cu元素，同時降低Mn元素含量，并采用電弧熔煉+銅模吸鑄工藝制備了CrMnFeVCu系高熵合金，并系統(tǒng)研究了合金的成分設(shè)計和元素配比對高熵合金組織和性能的影響機(jī)理。結(jié)果表明，CrMnFeV四元合金由BCC固溶體和極少量B2顆粒組成，CrMnxFeVCu0.2x （x= 0.3、0.5、0.7、1）合金由BCC結(jié)構(gòu)的樹枝晶相和FCC結(jié)構(gòu)的枝晶間相組成，且隨著Cu含量的增加，F(xiàn)CC枝晶間相的體積分?jǐn)?shù)和尺寸逐漸增大，相形態(tài)從顆粒狀逐漸轉(zhuǎn)變?yōu)殚L條狀和塊狀。壓縮試驗表明，CrMn0.3FeVCu0.06合金的屈服強度最高（1273 MPa），且塑性優(yōu)異（εf = 50.7%），隨著Cu含量的增加，合金的力學(xué)性能逐漸降低，這主要歸因于CrMnxFeVCu0.2x合金中主要的強化機(jī)制是位錯強化和第二相強化，而FCC相尺寸的增大會降低第二相強化的效果。

    Abstract:

    In this paper, a series of new Cr-Mn-Fe-V-Cu high-entropy alloys with high ductility were prepared by arc melting and suction casting. It was found that with the addition of Cu, the structure of the alloys evolved from BCC+BCC1 phases (CrFeMnV alloy) to BCC + FCC phases (CrFeMnxVCu0.2xalloys). Formation of the Cu-Mn-rich FCC phase was caused by immiscibility of Cu with V, Cr and Fe. With increase of Cu, the volume fraction of FCC phase increased, and the morphology of the FCC phase transformed from granular particles to long strips and blocks. The five Cr-Mn-Fe-V-Cu HEAs present a great balance between strength and ductility. The CrFeMn0.3VCu0.06 alloy with granular FCC particles exhibits highest compressive yield strength (1273 MPa) and excellent ductility (εf = 50.7%). The dislocation and precipitate strengthening are responsible for high strength of the CrFeMn0.3VCu0.06 alloy. Therefore, the dislocation density and distribution of FCC phase are the crucial factors influencing both microstructures and mechanical properties of the HEAs.

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引用本文

宋若康,張琳. CrFeMnVCu系高熵合金的微觀組織和性能[J].稀有金屬材料與工程,2021,50(10):3707~3713.[song ruokang, Zhang Lin. Microstructure and Mechanical Properties of CrFeMnVCu High Entropy Alloys[J]. Rare Metal Materials and Engineering,2021,50(10):3707~3713.]
DOI：10.12442/j. issn.1002-185X.20200817

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  • 收稿日期:2020-10-22
  • 最后修改日期:2020-11-25
  • 錄用日期:2020-12-23
  • 在線發(fā)布日期: 2021-10-28
  • 出版日期: 2021-10-25