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Mechanical properties and microstructure of the Al0.3CoCrFeNiTi0.3 high entropy alloy under dynamic compression
Zhong, Xianzhe1; Zhang, Qingming1; Xie, Jing1; Wu, Mingze1; Jiang, Fuqing2; Yan, Yongming1; Wang, Zhiwei1
Corresponding AuthorZhang, Qingming(qmzhang@bit.edu.cn)
2021-04-22
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume812Pages:11
AbstractIn this work, the mechanical properties and corresponding microstructural evolution of the as-cast Al0.3CoCrFeNiTi0.3 high-entropy alloy (HEA) under quasi-static and dynamic compressive loadings were investigated. The HEA consisted of FCC/L12 + BCC/B2 mixed solutions exhibited a good combination of high strength and large ductility upon quasi-static loading, which is mainly due to the strengthening effect of coherent L12-nanoparticles. The HEA exhibited a significant positive strain rate effect, and its yield strength rised from 810 to 1181 MPa when the strain rate increased from 10-3 to 4700 s-1. Compared with the quasi-static condition, the density of stacking fault (SF) networks and immobile Lomer?Cottrell (L-C) locks were greater under dynamic loading. Furthermore, the deformation mode of the HEA was dominated by planar glide under high strain rate loading, and the dislocation substructure showed Taylor lattice, high-density dislocation walls and intersected microbands with the increase of strain. The dynamic Hall?Petch and microband-induced plasticity effects could be responsible for the excellent dynamic compressive properties. Fractographic observations indicated that the fracture of the HEA is controlled by the mixed ductile-brittle mechanism under dynamic compressive loading. An improved Johnson-Cook (J-C) constitutive model considering adiabatic temperature rise was employed to predict the plastic flow behavior of the HEA under dynamic conditions and the improved J-C model was in good agreement with the experimental results.
KeywordHigh-entropy alloy Dynamic loading Mechanical properties Dislocation structures Constitutive model
Funding OrganizationNational Key R&D Program of China ; Civil Aerospace Pre Research Project
DOI10.1016/j.msea.2021.141147
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2016YFC0801204] ; Civil Aerospace Pre Research Project[D020304]
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000639101200002
PublisherELSEVIER SCIENCE SA
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/162354
Collection中国科学院金属研究所
Corresponding AuthorZhang, Qingming
Affiliation1.Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Zhong, Xianzhe,Zhang, Qingming,Xie, Jing,et al. Mechanical properties and microstructure of the Al0.3CoCrFeNiTi0.3 high entropy alloy under dynamic compression[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,812:11.
APA Zhong, Xianzhe.,Zhang, Qingming.,Xie, Jing.,Wu, Mingze.,Jiang, Fuqing.,...&Wang, Zhiwei.(2021).Mechanical properties and microstructure of the Al0.3CoCrFeNiTi0.3 high entropy alloy under dynamic compression.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,812,11.
MLA Zhong, Xianzhe,et al."Mechanical properties and microstructure of the Al0.3CoCrFeNiTi0.3 high entropy alloy under dynamic compression".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 812(2021):11.
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