首页|Graphene enables equiatomic FeNiCrCoCu high-entropy alloy with improved TWIP and TRIP effects under shock compression

Graphene enables equiatomic FeNiCrCoCu high-entropy alloy with improved TWIP and TRIP effects under shock compression

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Graphene(Gr)reinforced high-entropy alloy(HEA)matrix composites are expected as potential candi-dates for next-generation structural applications in light of outstanding mechanical properties.A deep comprehension of the underlying deformation mechanisms under extreme shock loading is of paramount importance,however,remains lacking due to experimentally technical limitations in existence.In the present study,by means of nonequilibrium molecular dynamics simulations,dynamic deformation behav-iors and corresponding mechanisms in equiatomic FeNiCrCoCu HEA/Gr composite systems were investi-gated in terms of various shock velocities.The resistance to dislocation propagation imparted by Gr was corroborated to encourage the elevated local stress level by increasing the likelihood of dislocation inter-plays,which facilitated the onset of twins and hexagonal close-packed(HCP)martensite laths.Meanwhile,the advent of Gr was demonstrated to endow the HEA with an additional twinning pathway that induced a structural conversion from HCP to parent face-centered cubic(FCC)inside HCP martensite laths,differ-ent from the classical one that necessitated undergoing the intermediate procedure of extrinsic stacking fault(ESF)evolution.More than that,by virtue of an increase in flow stress,the transformation-induced plasticity(TRIP)effect was validated to be additionally evoked as the predominant strain accommodation mechanism at higher strains on the one hand,but which only assisted plasticity in pure systems,and on the other hand,can also act as an auxiliary regulation mode together with the twinning-induced plastic-ity(TWIP)effect under intermediate strains,but with enhanced contributions relative to pure systems.One may expect that TRIP and TWIP effects promoted by introducing Gr would considerably inspire a synergistic effect between strength and ductility,contributing to the exceptional shock-resistant perfor-mance of FeNiCrCoCu HEAs under extreme regimes.

Molecular dynamicsHigh-entropy alloyGrapheneTRIPTWIPShock

Hongcai Xie、Zhichao Ma、Wei Zhang、Hongwei Zhao、Luquan Ren

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School of Mechanical and Aerospace Engineering,Jilin University,Changchun 130025,China

Key Laboratory of CNC Equipment Reliability Ministry of Education,Jilin University,Changchun 130025,China

Institute of Structured and Architected Materials,Liaoning Academy of Materials,Shenyang 110167,China

Key Laboratory of Bionic Engineering Ministry of Education,Jilin University,Changchun 130025,China

Weihai Institute for Bionics-Jilin University,Weihai 264400,China

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国家自然科学基金国家自然科学基金Jilin Province Science and Technology Development Project中央高校基本科研业务费专项

9226620652227810YDZJ202101ZYTS1292022-JCXK-11

2024

10.1016/j.jmst.2023.06.035

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.170(3)
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