Peter K. Liaw
University of Tennessee
Ultimate tensile strengthAmorphous metalDeformation (engineering)Composite materialMetallurgyMaterials scienceStructural materialSuperalloyCondensed matter physicsAlloyHigh entropy alloysPhase (matter)Amorphous solidFracture mechanicsDuctilityNeutron diffractionPlasticityCrystallographyMicrostructureThermodynamics
1,128Publications
94H-index
33.5kCitations
Publications 1109
Newest
#1Yang Chen (Hunan University)H-Index: 8
#1Yang Chen (Hunan University)H-Index: 2
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
view all 6 authors...
Abstract The irradiation damage-induced voids can hinder dislocation glide, and thereby change the mechanical properties in the nuclear materials. However, the detailed process of the dislocation interacting with complex-shape void is not revealed well. Here, we study systematically the interaction between an edge dislocation and a polygonal void with different initial geometries in the irradiated metals by dislocation dynamics simulations, in terms of the critical resolved shear stress (CRSS). ...
2 CitationsSource
#1Jia Li (Hunan University)H-Index: 25
#1Jia Li (Hunan University)H-Index: 18
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
view all 9 authors...
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
#1Yiping Lu (DUT: Dalian University of Technology)H-Index: 30
#2Yong Dong (GDUT: Guangdong University of Technology)H-Index: 16
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract Eutectic high-entropy alloys (EHEAs), as a sub-group of high-entropy alloys (HEAs), are becoming a new research hotspot in the metallic materials community because of their excellent castability, fine and uniform microstructures even in the as-cast state, high strength, and good ductility. Some of the EHEAs have shown promising potentials for industrial applications. Here, the history, interesting solidification microstructure and mechanical properties, and the design strategy of EHEAs ...
47 CitationsSource
#1Y. G. Shi (CAS: Chinese Academy of Sciences)H-Index: 12
#2Bin Yang (USTB: University of Science and Technology Beijing)H-Index: 21
Last. Ying Zhao (CAS: Chinese Academy of Sciences)H-Index: 1
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Abstract High-entropy alloys (HEAs) are inherently complex and potentially span a vast composition space, making their research and discovery challenging. In the present study, high-throughput synthesis of an Alx(CoCrFeNi)100-x combinatorial material library covering x = 4.5–40 atomic percent Al is achieved, using magnetron co-sputtering. The effects of Al on the microstructure and corrosion behavior are investigated. With the increased amount of Al, crystal-structures of thin films transform fr...
6 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
view all 6 authors...
Abstract The precipitates play a significant role in not only enhancing the strength, but also maintaining the high toughness in alloys. However, the interactions of the nanoscale precipitates with dislocations in the high entropy alloys (HEAs) are difficult to observe directly by in-situ TEM experiments due to the limits of the resolution and time. Here, using atomic simulations we report the synergistic strengthening of the coherent precipitate and atomic-scale lattice distortion in the HEAs a...
16 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
view all 8 authors...
Abstract High-entropy amorphous alloys present high hardness, but low tensile ductility. Here, deformation behaviour of the amorphous/crystalline FeCoCrNi high-entropy alloy (HEA) composite prepared by the previous experiment is investigated using atomic simulations. The result shows the partial dislocations in the crystal HEA layer, and the formation of shear bands in the amorphous HEA layer occurs after yielding. The strength of the amorphous/crystalline HEA composite reduces with increasing t...
4 CitationsSource
#1Baobin XieH-Index: 2
#2Qihong FangH-Index: 29
Last. Peter K. LiawH-Index: 94
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In the alloy materials, their mechanical properties mightly rely on the compositions and concentrations of chemical elements. Therefore, looking for the optimum elemental concentration and composition is still a critical issue to design high-performance alloy materials. Traditional alloy designing method via “trial and error” or domain experts’ experiences is barely possible to solve the issue. Here, we propose a “composition-oriented” method combined machine learning to design the Cu–Zn alloys ...
Source
#1William Yi Wang (NPU: Northwestern Polytechnical University)H-Index: 18
#2Bin Gan (NPU: Northwestern Polytechnical University)H-Index: 13
Last. Zi Kui Liu (PSU: Pennsylvania State University)H-Index: 79
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Abstract Metallic amorphous/crystalline (A/C) nanolaminates exhibit excellent ductility while retaining their high strength. However, the underlying physical mechanisms and the resultant structural changes during plastic deformation still remain unclear. In the present work, the structure-property relationship of CuZr/Cu A/C nanolaminates is established through integrated high-throughput micro-compression tests and molecular dynamics simulations together with high-resolution transmission electro...
4 CitationsSource
#1Jiang Li (DUT: Dalian University of Technology)H-Index: 3
#2Zhijun Li (DUT: Dalian University of Technology)H-Index: 72
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract This present work simulated the coherent BCC/B2 microstructures existing in body-centered-cubic (BCC)-based Al-Ni-Co-Fe-Cr high entropy alloys (HEAs) in light of the phase-field method. These coherent BCC/B2 microstructures contain spherical or cuboidal nanoprecipitates, or exhibit a weave-like spinodal decomposition in experiments. Based on the Chan-Hilliard equation, a two-dimensional phase field model was established using the COMSOL Multiphysics software to reveal the coherent micro...
6 CitationsSource
#1Ruixuan LiH-Index: 5
#2Lu Xie (USTB: University of Science and Technology Beijing)H-Index: 6
Last. Yong ZhangH-Index: 112
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High-entropy alloys (HEAs) open up new doors for their novel design principles and excellent properties. In order to explore the huge compositional and microstructural spaces more effectively, high-throughput calculation techniques are put forward, overcoming the time-consuming and laboriousness of traditional experiments. Here we present and discuss four different calculation methods that are usually applied to accelerate the development of novel HEA compositions, that is, empirical models, fir...
6 CitationsSource