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Acta Metall Sin  2018, Vol. 54 Issue (11): 1553-1566    DOI: 10.11900/0412.1961.2018.00372
Materials and Processes Current Issue | Archive | Adv Search |
Deformation Behavior and Toughening of High-Entropy Alloys
Zhaoping LU(), Zhifeng LEI, Hailong HUANG, Shaofei LIU, Fan ZHANG, Dabo DUAN, Peipei CAO, Yuan WU, Xiongjun LIU, Hui WANG
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
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A new alloy design concept, high-entropy alloys (HEAs), has attracted increasing attentions and becomes a new research highlight recently. Different from traditional alloy design strategy which usually blends with one or two elements as the principal constituent and other minor elements for the further optimization of properties, HEAs are multicomponent alloys containing several principle elements (usually ≥5) in equiatomic or near equiatomic ratio. Due to their unique atomic structure, HEAs possess a lot of distinguished properties. Since the discovery of HEAs, a variety of HEA systems have been developed and shown unique physical, chemical and thermodynamic properties, especially the promising mechanical properties such as high strength and hardness, abrasion resistance, corrosion resistance and softening resistance. Here in this short review manuscript, starting from the research challenges for understanding the deformation mechanism of HEAs, this work briefly summarized the mechanical properties and deformation behavior of HEAs, reviewed the proposed strengthening-toughening strategies and their corresponding deformation mechanism in HEAs. A brief perspective on the research directions of mechanical behavior of HEAs was also proposed.

Key words:  high-entropy alloy      toughening      deformation behavior and mechanism     
Received:  16 August 2018     
ZTFLH:  TG457.19  
Fund: Supported by National Natural Science Foundation of China (Nos.51671018, 51871016, 11790293, 51531001 and 51671021), Program of Introducing Talents of Discipline to University of China (No.B07003) and Fundamental Research Funds for the Central Universities (Nos.FRF-TP-18-004C1and FRF-TP-15-004C1)

Cite this article: 

Zhaoping LU, Zhifeng LEI, Hailong HUANG, Shaofei LIU, Fan ZHANG, Dabo DUAN, Peipei CAO, Yuan WU, Xiongjun LIU, Hui WANG. Deformation Behavior and Toughening of High-Entropy Alloys. Acta Metall Sin, 2018, 54(11): 1553-1566.

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Fig.1  True tensile stress-strain curves of high-entropy alloys (HEAs) with different Ta contents (a), ultimate tensile strength and ductility of the ductilized HEAs, in comparison with other advanced alloys (b) (IF—interstitial free, TWIP—twinning induced plasticity, TRIP—transformation induced plasticity)
Fig.2  Room-temperature tensile properties of FeCoNiCr HEA with Ti and Al addition
Fig.3  Characterization of the morphology and structure of precipitate in FeCoNiCr HEA with Ti and Al addition
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