Yanfei Gao
University of Tennessee
Ultimate tensile strengthAmorphous metalFinite element methodDislocationComposite materialMetallurgyMaterials scienceDeformation mechanismCondensed matter physicsAlloyIndentationNanoindentationSlip (materials science)MechanicsNucleationPlasticityCrystallographyAnisotropyMicrostructureStress (mechanics)
183Publications
38H-index
5,200Citations
Publications 179
Newest
#1X.L. Li (Hunan University)H-Index: 2
#2Zhongtao Li (Hunan University)H-Index: 1
Last. Yanfei Gao (UT: University of Tennessee)H-Index: 38
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Abstract In the current work, a parallel comparison of the influence of Al, Mo and Ti, on the microstructure and strengthening of the CoCrFeNi alloy was conducted. To achieve this, inconsistencies on variables including the extent of alloying, thermomechanical processing and property-evaluation method were avoided. Microstructurally, following cold-rolling, annealing of the 4 at.% Al-doped alloys at 800-1000 °C did not result in phase separation; nevertheless, that of the 4 at.% Mo- and Ti-doped...
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#1Liubin Xu (UT: University of Tennessee)H-Index: 3
#2Luis Casillas-Trujillo (UT: University of Tennessee)H-Index: 2
Last. Haixuan Xu (UT: University of Tennessee)H-Index: 21
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Abstract null null Stacking fault energy (SFE) in fcc materials is a fundamental property that is closely related to Shockley partial dislocations and deformation twinning, the latter of which is potentially responsible for some of the exceptional mechanical properties observed in Ni-based high/medium-entropy alloys. In this study, the SFEs and twinning energies over a wide range of compositions are systematically determined in model Ni-based binary alloys using both first-principles density fun...
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#1Qingqing Ding (ZJU: Zhejiang University)H-Index: 9
#2Hongbin Bei (ZJU: Zhejiang University)H-Index: 62
Last. Ze Zhang (ZJU: Zhejiang University)H-Index: 77
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Abstract The GH3536 (Hastelloy X) superalloy is one of the most widely used Ni-based sheet alloys for gas turbine hot parts. In order to investigate its relationship among the processing, microstructure, and mechanical properties, GH3536 alloy was fabricated from pure constituent elements by arc melting and drop casting. The drop-cast ingots were homogenized, cold rolled and recrystallized to obtain single phase microstructure with average grain size of ∼ 12 μm. Tensile tests were then performed...
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#1Xue WangH-Index: 3
#2Yanfei GaoH-Index: 38
Last. Zhili FengH-Index: 33
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Abstract Friction stir welding (FSW) has found increased applications in automotive and aerospace industries due to its advantages of solid-state bonding, no fusion and melting, and versatility in various working conditions and material combinations. However, the relationship among processing parameters, material properties, and bonding extent and fidelity remains largely empirical, primarily because of the lack of the mechanistic understanding of the tool-workpiece frictional behavior that affe...
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#1Weidong Li (UT: University of Tennessee)H-Index: 16
#2Di Xie (UT: University of Tennessee)H-Index: 2
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract Research in the field of high-entropy alloys has been surging since the 2010s. As widely acknowledged, research interests in this field are largely sparked by the enormous possibilities in compositions, microstructures, and properties. In the first decade of extensive investigations, while many avenues of research in this vibrant field are being continuously opened, a considerable portion of endeavors is directed toward two very fundamentally important aspects. One is the exploration of...
2 CitationsSource
#1Di Xie (UT: University of Tennessee)H-Index: 2
#2Zongyang Lyu (UT: University of Tennessee)H-Index: 2
Last. Yanfei Gao (UT: University of Tennessee)H-Index: 38
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Abstract Unlike many Mg alloys that exhibit limited ductility, duplex Mg-Li alloys possess enhanced ductility but the underlying mechanisms are unclear. Using real-time in situ neutron diffraction measurements, we show that the underlying deformation modes in this duplex microstructure include an early yield of body-centered-cubic (BCC) β-Li phase and the later elevated hardening in this phase at large macroscopic plastic strain, and the sequential activation of basal and pyramidal slip systems ...
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#1Xin Cai (UT: University of Tennessee)
#2Wei Liu (China University of Petroleum)
Last. Yanfei Gao (UT: University of Tennessee)H-Index: 38
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Abstract A user-friendly and generic finite element framework for simulating hydraulic fracture with a complex crack network in unconventional oil and gas exploitation is developed in this work with the following unique features. While the cohesive zone model (CZM) removes crack singularities, its finite element simulations suffer numerical convergence problem during crack nucleation and growth, which can be regularized by a fictitious viscosity approach. The decoupling of cohesive-cracked solid...
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#1Di Xie (UT: University of Tennessee)H-Index: 2
#2Zongyang Lyu (UT: University of Tennessee)H-Index: 2
Last. Yanfei Gao (UT: University of Tennessee)H-Index: 38
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Abstract This work investigates the microscopic deformation mechanisms of an extruded, precipitation-strengthened AZ80 magnesium (Mg) alloy subjected to strain-controlled low-cycle fatigue using in situ neutron diffraction measurements. Results demonstrate that the plastic deformation during cyclic loading is dominated by the alternating {10.2} extension twinning and detwinning mechanisms. The observed deformation mode is strongly texture and precipitate dependent. For the initial texture, the t...
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#1Wei Niu (UT: University of Tennessee)
#2Yanfei Gao (UT: University of Tennessee)H-Index: 38
Abstract Metallic materials under extreme thermo-mechanical-environmental service conditions oftentimes rely on the formation of dense and protective oxide layers, e.g., typically alumina or chromia. Their failures, however, usually emerge from the morphological instability of such layers at the oxide-alloy interface. This work suggests that a tensile, biaxial stress arises in the substrate alloy due to the concomitant oxidation-diffusion-creep processes, which, in contrast to the growth stress ...
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#1Yanfei Gao (UT: University of Tennessee)H-Index: 38
#2W. Zhang (UT: University of Tennessee)
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...
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