Jia Li
Hunan University
Ultimate tensile strengthDiffusion (business)Nanocrystalline materialDeformation (engineering)DislocationChemical physicsComposite materialMetallurgyMaterials scienceDeformation mechanismCondensed matter physicsSurface integrityAlloyHigh entropy alloysIndentationShear modulusGrain boundaryNanoindentationMachiningSlip (materials science)Fracture mechanicsMolecular dynamicsNucleationCrystal twinningCrack closurePlasticityCrystallographyPrecipitation (chemistry)Peierls stressMicrostructureStress (mechanics)Thermodynamics
103Publications
18H-index
1,149Citations
Publications 51
Newest
#1Yanru Chen (Hunan University)
#2Qingkun Zhao (Hunan University)H-Index: 1
Last. Jia Li (Hunan University)H-Index: 18
view all 5 authors...
Abstract The physical and mechanical properties can be greatly affected by lattice distortion caused by interstitial atoms. However, at nanoscale, effect of interstitial atom on high entropy alloys (HEAs) still requires to be discussed. Here, we study effect of interstitial N atom on formation energy, lattice constant, elastic modulus, density of states, and deformation charge density in FeCoCrNiMn HEAs using first-principles calculation. The results show that the incorporation of N atom makes H...
Source
#1Yuanyuan Tian (Hunan University)H-Index: 5
#2Hui Feng (Hunan University)H-Index: 9
Last. Liangchi Zhang (UNSW: University of New South Wales)H-Index: 74
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Abstract Nanoscale sliding friction behavior of nanoparticle on Cu/Ag bilayers influenced by water film is investigated by molecular dynamics (MD) simulation. The results show that the existence of water film aggravates the subsurface damage and the change of Cu/Ag interface microstructure, but improves the quality of groove surface and decreases the friction coefficient. Under the water-assisted sliding, there is a water-film thickness to minimize subsurface damage and friction coefficient, whi...
1 CitationsSource
#1Hang Xiao (Hunan University)
#2Yifan Dai (National University of Defense Technology)
Last. Jia Li (Hunan University)H-Index: 25
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Abstract The ion beam polishing techniques for silicon wafers play a key role in the fabrication of optical element. However, the dynamical ion beam polishing process at nanoscale time and space is very difficult to be recorded and observed, which most directly affects the quality of the machined surface. Here, the material removal and surface generation process during ion beam polishing are investigated using atomic simulation. In order to reveal the effects of the Ar ion dose, surface roughnes...
1 CitationsSource
#1Jia Li (Hunan University)H-Index: 18
#1Jia Li (Hunan University)H-Index: 25
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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High entropy alloys (HEAs) exhibit an unusual combination of high fracture strength and ductility. However, atomic mechanisms responsible for crack propagation in HEAs are still not clear, which limits further improving the damage tolerance. Here we investigate effect of crystal orientation on the crack-tip behaviors in single-crystal HEA CrMnFeCoNi using atomic simulations to explore fracture micromechanism. The formation of deformation twinning and activation of multislip systems are observed ...
4 CitationsSource
#1Fusheng Tan (Hunan University)H-Index: 2
#2Jia Li (Hunan University)H-Index: 18
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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In-depth understanding of grain boundaries (GBs) in multi-principal element alloys (MPEAs) is significant for designing MPEAs by GB engineering. This work explores the nanoscale GB structure and migration mechanism in MPEAs using atomic simulations. The GB-roughening transformation is observed as the mixing entropy increases, and the effect of entropy is confirmed by thermodynamic analysis. The entropy-induced transition of GB migration is proved: 1) the “concentrated shuffling mechanism” contro...
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#1Ao Fu (CSU: Central South University)H-Index: 6
#2Bin Liu (CSU: Central South University)H-Index: 85
Last. Yong Liu (CSU: Central South University)H-Index: 42
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Abstract We introduce a novel stainless equiatomic FeCrNi medium entropy alloy (MEA) with improved tensile properties and corrosion resistance. This alloy exhibits superior tensile properties with yield strength of 644 MPa, ultimate tensile strength of ~1.03 GPa and ductility of ~54 %, mainly owing to the multiple deformation mechanisms including nanotwinning, deformation induced phase transformation and solution strengthening of intersitial elements. The high content of Cr in this alloy stimula...
10 CitationsSource
#1Shenghang Xu (CSU: Central South University)H-Index: 3
#2Meng Du (CSU: Central South University)H-Index: 1
Last. Yong Liu (CSU: Central South University)H-Index: 42
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Abstract Nature materials, such as bones and nacre, achieve excellent balance of toughness and strength via a hierarchical “brick-and-mortar” microstructure, which is an attractive model for engineering materials design. Here, we produced nacre-like Ti-Ta metallic composites via a powder metallurgy process, during which mixed powders were sintered by spark plasma sintering, followed by hot and cold rolling and then annealing. The structure consists of soft Ta-enriched regions and hard Ti-enriche...
5 CitationsSource
#1Qingkun Zhao (Hunan University)H-Index: 1
#2Jia Li (Hunan University)H-Index: 18
Last. Hui Feng (Hunan University)H-Index: 9
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Abstract The elastic and plastic properties, generalized stacking-fault energy, surface energy, and electronic properties of AlxFeCuCrNi high-entropy alloys are studied via first-principle calculations. The present work is performed by employing density-functional theory within the general gradient approximation and virtual crystal approximation model. The increasing Al concentration enhances Young's modulus, bulk modulus and shear modulus, but it reduces the ductility based on the investigation...
10 CitationsSource
#1X. Zeng (Hunan University)H-Index: 6
#1Xin ZengH-Index: 1
Last. Pihua Wen (Lond: University of London)H-Index: 26
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Source
#1Jia Li (Hunan University)H-Index: 18
#2Haotian Chen (Hunan University)H-Index: 5
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
view all 8 authors...
Abstract The microstructures determine the macro-mechanical properties in metals and alloys. However, the formation mechanism of microstructures in high-entropy alloys (HEAs) rapidly cooled to room temperature still remains unknown at nanoscale. Here, we present the AlCoCrCuFeNi HEAs prepared by various cooling rates and the deformation behaviour using molecular dynamic simulation. The results show that the radial distribution function of HEAs is in good agreement with the previous experimental ...
19 CitationsSource