CrCoNi中熵合金变形中位错与孪晶协调变形机制

doi:10.11896/cldb.20090129

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (4505KB)
Export: BibTeX | EndNote (RIS)

Abstract How to improve plasticity and toughness of materials while improving strength has always been one of the hotspots in the field of material scie-nce, which is also a major scientific problem in the field of materials and an important bottleneck restricting the development of materials. The CrCoNi medium entropy alloy has excellent strength and plasticity at room temperature and low temperature, especially at liquid nitrogen temperature, which attracts the attention of researchers.
In the early stage of deformation, the traditional metal is mainly dislocation slip. With the increase of strain, twins are induced, and the coordinated deformation of twins and dislocations is realized.Unlike conventional metals, the CrCoNi medium entropy alloy has very low stacking fault energy, it is easy to form a large number of stacking faults, dislocations and twins in the deformation process. Nano-twins are introduced to refine grains in the deformation, and the coordinated improvement of strength and toughness is realized through fine grain strengthening. Moreover,twins can form three-dimensional network and improve the ability of coordinated deformation.In addition,during the deformation process of CrCoNi alloy, there is an interaction between dislocations and twins. After dislocation packing, twins are triggered, which hinders the movement of dislocations and improves the dislocation density. The dislocation slip channel is adjusted to promote dislocation cross slip. Thus, the plastic deformation of CrCoNi alloy is more uniform and the contradiction between strength and toughness is coordinated.
In order to explain the relationship between excellent mechanical properties and nano-structure of CrCoNi medium entropy alloy during deformation, this paper starts from the deformation mechanism of CrCoNi medium entropy alloy, summarizes the existing morphology, motion mode and coordination mechanism of dislocation and twin in the deformation process of CrCoNi alloy, analyzes the interaction between dislocation and twin in CrCoNi alloy under different deformation conditions and their influence on deformation, and discusses the dominant mechanism of dislocation-twin synergistic strengthening and toughening. Finally, future research of medium entropy alloy is prospected.

Key words： medium entropy alloy dislocation twin coordination deformation strengthening and toughening mechanism

Published: Online: 2022-07-26

CLC number:

TG139

Fund:Yunnan Provincial Science and Technology Department Fund Oriented(908075156031),Key Laboratory Project of Sichuan Province for Comprehensive Utilization of Vanadium and Titanium Resources(2018FTSZ41),and Panzhihua City Science and Technology Guidance Plan Program(2020ZD-G-10).

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	CHEN Jinliang
	FENG Zhongxue
	YI Jianhong

Cite this article:

CHEN Jinliang,FENG Zhongxue,YI Jianhong. Coordination Deformation Mechanism Between Dislocation and Twin in CrCoNi Medium Entropy Alloy[J]. Materials Reports, 2022, 36(14): 20090129-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20090129 OR http://www.mater-rep.com/EN/Y2022/V36/I14/20090129

1 Rao J C,Diao H Y,Ocelík V,et al. Acta Materialia, 2017,131,206.
2 Dennis E J,Nokeun P. Materials Letters, 2019,255,126528.
3 Schneider M, George E P, Manescau T J,et al. Data in Brief, 2019,27,104592.
4 Laplanche G, Kostka A, Reinhart C,et al. Acta Materialia,2017,128,292.
5 Bernd G, Anton H, Keli V T, et al. Nature Communications,2016,7,10602.
6 Zhang Z J, Sheng H W, Wang Z J, et al. Nature Communications, 2017, 8,14390.
7 Chen C X.Deformation mechanism of high entropy alloy. Ph.D. Thesis, Zhejiang University, China, 2018(in Chinese).
陈陈旭.高熵合金微观变形机理.博士学位论文,浙江大学,2018
8 Laplanche G, Schneider M, Scholz F,et al. Scripta Materialia, 2020,177,44.
9 Liang Y X,Yang X F,Ming K S,et al. Science China Technological Sciences, 2021,64(2),407.
10 Slone C E, Chakraborty S, Miao J,et al. Acta Materialia, 2018,158,38.
11 Slone C E, Miao J, George E P,et al. Acta Materialia, 2019,165,496.
12 Wen R, You C P, Zeng L F,et al. Journal of Materials Science, 2020,55(26),12544.
13 Wu X L, Yang M X, Jiang P,et al. Scripta Materialia, 2020,178,452.
14 Yang M X, Zhou L L, Wang C,et al. Scripta Materialia, 2019,172,66.
15 Dan S G,Werner S, Jose R I,et al. Materials Science Forum, 2018,941,833.
16 Dan S G,Werner S,Aurimas P,et al. Intermetallics, 2018,101,87.
17 Sathiaraj G D,Kalsar R,Kumar S S,et al. Materials Today: Proceedings, 2020,27,2147.
18 He G A, Zhao Y F,Gan B,et al. Journal of Alloys and Compounds, 2020,815,152382.
19 Slone C E, LaRosa C R, Zenk C H,et al. Scripta Materialia, 2020,178,295.
20 Huang H, Li X Q, Dong Z H,et al. Acta Materialia, 2018,149,388.
21 Praveen S,Peyman A R,JeongM P,et al. Materials Science & Enginee-ring A, 2019,766,138372.
22 Lu W J,Luo X,Yang Y Q,et al. Materials Chemistry and Physics, 2019,238,121841.
23 Sadeghilaridjani M,Mukherjee S. JOM, 2019,71,3466.
24 Praveen S,Peyman A R,Jae W B,et al. Intermetallics, 2019,113,106578.
25 Bin G,Jeffrey M W, Zhongnan B,et al. Journal of Materials Science & Technology, 2019,35,957.
26 Dennis E J,Yongsu L,Myeong H J,et al. Materials Letters,2019,253,327.
27 Lu L,Chen X, Lu K,et al. Science, 2009,323,607.
28 Slone C E, George E P, Mills M J. Journal of Alloys and Compounds, 2020,817,152777.
29 Zhang R P, Zhao S T, Ding J, et al. Nature, 2020,581,283.
30 Binglun Y, Shuhei Y, Nobuhiro T, et al. Nature Communications, 2020,11,2507.
31 Zhang F X, Zhao S J, Jin K,et al. Physical Review Letters, 2017,118,205501.
32 He G A,Zhao Y F,Gan B,et al. Journal of Alloys and Compounds, 2020,815,152382.
33 Ma Y,Yuan F P,Yang M X,et al. Acta Materialia, 2018,148,407.
34 Yuan F P, Cheng W Q, Zhang S D,et al. Materialia, 2020,9,100565.
35 Feng K, Zhang Y, Li Z G,et al. Surface & Coatings Technology, 2020,397,126004.
36 Tsianikas S J, Chen Y, Xie Z. Materials Science & Technology, 2020,39,183.