Peijian Shi
Shanghai University
Composite numberUltimate tensile strengthNeckingDeformation (engineering)Strain hardening exponentComposite materialDynamic recrystallizationEutectic systemAtomHardening (metallurgy)Materials scienceSolid solution strengtheningAtomic diffusionStrength of materialsWork hardeningThermomechanical processingCastabilityStacking faultExtrusionAlloyHigh entropy alloysRibbonFracture (geology)Elastic modulusPhase (matter)DuctilityAtomic unitsCrystal twinningElectrical resistivity and conductivityAnnealing (metallurgy)Lamellar structureEquiaxed crystalsPrecipitation (chemistry)Grain boundary strengtheningMicrostructure
Publications 6
#1Peijian ShiH-Index: 2
#2Yat LiH-Index: 93
Last. Yunbo ZhongH-Index: 20
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Abstract Over recent years, eutectic high-entropy alloys (EHEAs) have intrigued substantial research enthusiasms due to their good castability as well as balanced strength–ductility synergy. In this study, a bulk cast Al19.25Co18.86Fe18.36Ni43.53 EHEA is developed with fine in-situ lamellar eutectics. The eutectics comprise alternating ordered face-centered-cubic (L12) and ordered body-centered-cubic (B2) phases with semi-coherent interfaces. The resulting microstructure resembles that of most r...
Abstract null null The mechanical and electrical properties of continuously cast Cu-0.4 wt%Te alloy produced by continuous extrusion forming at 800 °C were investigated. It was found that this thermomechanical processing was an effective way to induce the formation of refined recrystallized grain and promote dynamic precipitation of Te atom, thereby simultaneously improving the strength, ductility and electrical conductivity of Cu-0.4 wt%Te alloy.
#1Yanfei Gao (UT: University of Tennessee)H-Index: 38
#2Wei Zhang (UT: University of Tennessee)H-Index: 132
Last. Yifei Zhong (SHU: Shanghai University)H-Index: 16
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Abstract Among various mechanisms responsible for the strength-ductility trade-off in metallic materials, the leading strategy is to delay the onset of necking by improving the work hardening rate via a number of metallurgical approaches such as heterogeneous or gradient microstructures. Recent research activities on high-entropy alloys also witness a wide range of alloy design capabilities that permit these microstructural designs such as the dual-phase lamellar microstructures. This work addre...
#1Peijian Shi (SHU: Shanghai University)H-Index: 2
#2Yunbo Zhong (SHU: Shanghai University)H-Index: 20
Last. Yuntian Zhu (Nanjing University of Science and Technology)H-Index: 111
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Abstract High strength of materials usually comes with low ductility due to the lost or short-lived strain hardening. Here, we uncover a sequentially-activated multistage strain hardening (SMSH) that allows for sustained and effective strain-hardening capability in strong ultrafine-grained eutectic high-entropy alloy (EHEA). Consequently, exceptional ductility is realized in an ultrafine-grained EHEA, accompanied with high ultimate strength. We demonstrate that the SMSH is derived from a coordin...
4 CitationsSource
#1Tianxiang Zheng (SHU: Shanghai University)H-Index: 10
#2Peijian Shi (SHU: Shanghai University)H-Index: 2
Last. Qiuliang Wang (CAS: Chinese Academy of Sciences)H-Index: 20
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Abstract Al-20wt.%Si hypereutectic alloys were designed in order to study how a high static magnetic field (HSMF) during annealing affected the microstructure evolution, atomic diffusion, and resultant mechanical properties from the microscale to the atomic scale. Our results indicate that the size of the primary silicon particles (PSPs) increased with increasing temperature, while it decreased with increasing magnetic flux density (MFD). The solid solubilities of the Al matrix were 0.84 wt% and...
#1Peijian Shi (SHU: Shanghai University)H-Index: 2
#2Weili Ren (SHU: Shanghai University)H-Index: 18
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Realizing improved strength–ductility synergy in eutectic alloys acting as in situ composite materials remains a challenge in conventional eutectic systems, which is why eutectic high-entropy alloys (EHEAs), a newly-emerging multi-principal-element eutectic category, may offer wider in situ composite possibilities. Here, we use an AlCoCrFeNi2.1 EHEA to engineer an ultrafine-grained duplex microstructure that deliberately inherits its composite lamellar nature by tailored thermo-mechanical proces...
149 CitationsSource