In situ neutron diffraction unravels deformation mechanisms of a strong and ductile FeCrNi medium entropy alloy

doi:10.1016/j.jmst.2021.10.034

CORC > 金属研究所 > 中国科学院金属研究所

	In situ neutron diffraction unravels deformation mechanisms of a strong and ductile FeCrNi medium entropy alloy
	Tang, L.1; Jiang, F. Q.2; Wrobel, J. S.3; Liu, B.4; Kabra, S.5; Duan, R. X.1; Luan, J. H.6; Jiao, Z. B.7; Attallah, M. M.1; Nguyen-Manh, D.8
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2022-07-20
卷号	116 页码:103-120
关键词	Medium entropy alloy Multi-component alloy Cryogenic temperature Neutron diffraction
ISSN号	1005-0302
DOI	10.1016/j.jmst.2021.10.034
通讯作者	Nguyen-Manh, D.(Duc.Nguyen@ukaea.uk) ; Cai, B.(b.cai@bham.ac.uk)
英文摘要	We investigated the mechanical and microstructural responses of a high-strength equal-molar medium entropy FeCrNi alloy at 293 and 15 K by in situ neutron diffraction testing. At 293 K, the alloy had a very high yield strength of 651 +/- 12 MPa, with a total elongation of 48% +/- 5%. At 15 K, the yield strength increased to 1092 +/- 22 MPa, but the total elongation dropped to 18% +/- 1%. Via analyzing the neutron diffraction data, we determined the lattice strain evolution, single-crystal elastic constants, stacking fault probability, and estimated stacking fault energy of the alloy at both temperatures, which are the critical parameters to feed into and compare against our first-principles calculations and dislocation-based slip system modeling. The density functional theory calculations show that the alloy tends to form short-range order at room temperatures. However, atom probe tomography and atomic-resolution transmission electron microscopy did not clearly identify the short-range order. Additionally, at 293 K, experimental measured single-crystal elastic constants did not agree with those determined by first-principles calculations with short-range order but agreed well with the values from the calculation with the disordered configuration at 2000 K. This suggests that the alloy is at a metastable state resulted from the fabrication methods. In view of the high yield strength of the alloy, we calculated the strengthening contribution to the yield strength from grain boundaries, dislocations, and lattice distortion. The lattice distortion contribution was based on the Varenne-Luque-Curtine strengthening theory for multi-component alloys, which was found to be 316 MPa at 293 K and increased to 629 MPa at 15 K, making a significant contribution to the high yield strength. Regarding plastic deformation, dislocation movement and multiplication were found to be the dominant hardening mechanism at both temperatures, whereas twinning and phase transformation were not prevalent. This is mainly due to the high stacking fault energy of the alloy as estimated to be 63 mJm(-2) at 293 K and 47 mJm(-2) at 15 K. This work highlights the significance of lattice distortion and dislocations played in this alloy, providing insights into the design of new multi-component alloys with superb mechanical performance for cryogenic applications. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	CityU grant[9360161] ; RGC grant[25202719] ; Euratom research and training program 2014-2018[633053] ; RCUK Energy Programme[EP/T012250/1] ; European Research Council (ERC) under the European Union[714697] ; high-performing computing facility MARCONI (Bologna, Italy) by EUROfusion ; Polish Minister of Science and Higher Education[5018/H2020-Euratom/2019/2] ; Interdisciplinary center for Mathematical and Computational Modeling (ICM) , University of Warsaw[GB79-6] ; Euratom research and training program 2019-2020[633053]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000788821800003
资助机构	CityU grant ; RGC grant ; Euratom research and training program 2014-2018 ; RCUK Energy Programme ; European Research Council (ERC) under the European Union ; high-performing computing facility MARCONI (Bologna, Italy) by EUROfusion ; Polish Minister of Science and Higher Education ; Interdisciplinary center for Mathematical and Computational Modeling (ICM) , University of Warsaw ; Euratom research and training program 2019-2020
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/172515]
专题	金属研究所_中国科学院金属研究所
通讯作者	Nguyen-Manh, D.; Cai, B.
作者单位	1.Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.Warsaw Univ Technol, Fac Mat Sci & Engn, Ul Woloska 141, PL-02507 Warsaw, Poland 4.Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China 5.Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England 6.City Univ Hong Kong, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China 7.Hong Kong Polytech Univ, Dept Mech Engn, Hung Hom, Hong Kong, Peoples R China 8.United Kingdom Atom Energy Author, CCFE, Abingdon OX14 3DB, Oxon, England
推荐引用方式 GB/T 7714	Tang, L.,Jiang, F. Q.,Wrobel, J. S.,et al. In situ neutron diffraction unravels deformation mechanisms of a strong and ductile FeCrNi medium entropy alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2022,116:103-120.
APA	Tang, L..,Jiang, F. Q..,Wrobel, J. S..,Liu, B..,Kabra, S..,...&Cai, B..(2022).In situ neutron diffraction unravels deformation mechanisms of a strong and ductile FeCrNi medium entropy alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,116,103-120.
MLA	Tang, L.,et al."In situ neutron diffraction unravels deformation mechanisms of a strong and ductile FeCrNi medium entropy alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 116(2022):103-120.