Peter K. Liaw
University of Tennessee
Ultimate tensile strengthAmorphous metalDeformation (engineering)Composite materialMetallurgyMaterials scienceStructural materialSuperalloyCondensed matter physicsAlloyHigh entropy alloysPhase (matter)Amorphous solidFracture mechanicsDuctilityNeutron diffractionPlasticityCrystallographyMicrostructureThermodynamics
Publications 1109
#1Elaf A. Anber (Drexel University)H-Index: 4
#2Andrew C. Lang (Drexel University)H-Index: 10
Last. Mitra L. Taheri (Drexel University)H-Index: 2
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Abstract The AlxCoCrFeNi family of high entropy alloys (HEAs) has received considerable attention due to its promising thermal, mechanical, and corrosion-resistant properties which make it widely suited for aerospace and marine applications. While the formation of secondary phases has been studied at various annealing temperatures, the results have focused on the late stages of precipitation, highlighting the need for the analysis of the intermediate stage precipitation. Here we use in-situ heat...
2 CitationsSource
#1Chanho Lee (UT: University of Tennessee)H-Index: 12
#2Yi Chou (NCTU: National Chiao Tung University)H-Index: 4
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Severe distortion is one of the four core effects in single-phase high-entropy alloys (HEAs) and contributes significantly to the yield strength. However, the connection between the atomic-scale lattice distortion and macro-scale mechanical properties through experimental verification has yet to be fully achieved, owing to two critical challenges: 1) the difficulty in the development of homogeneous single-phase solid-solution HEAs and 2) the ambiguity in describing the lattice distortion and rel...
20 CitationsSource
#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...
12 CitationsSource
#1Tu Ngoc Lam (Can Tho University)H-Index: 4
#1Tu-Ngoc Lam (NCTU: National Chiao Tung University)H-Index: 7
Last. E-Wen Huang (JAEA: Japan Atomic Energy Agency)H-Index: 17
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Abstract We examined fatigue-crack-growth behaviors of CoCrFeMnNi high-entropy alloys (HEAs) under as-fatigued and tensile-overloaded conditions using neutron-diffraction measurements coupled with diffraction peak-profile analyses. We applied both high-resolution transmission electron microscopy (HRTEM) and neutron-diffraction strain mapping for the complementary microstructure examinations. Immediately after a single tensile overload, the crack-growth-retardation period was obtained by enhancin...
12 CitationsSource
Abstract The Ti–48Al–2Cr alloy was subjected to the plasma-hydrogenation treatment. Then the alloy containing minor hydrogen was prepared (0.058 wt percent, wt.%). Hot-compression experiments were carried out at temperatures ranging from 1000 to 1,150 °C and strain rates ranging from 1 to 0.001 s−1. The results show that the peak stress after the plasma-hydrogenation treatment is lower than that of the unhydrogenated one. At 1100 °C and the strain rate of 0.01 s−1, the peak stress is reduced by ...
#1Linxia Bi (DUT: Dalian University of Technology)H-Index: 2
#2Xiaona Li (DUT: Dalian University of Technology)H-Index: 8
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract Entropy-stabilized refractory metal oxide thin films have great application prospects in many fields due to their good preparation performance, excellent thermal stability, high hardness and abrasion resistance, and adjustable conductivity. In present paper, a series of (NbMoTaWV)100-xOx (x = 0–53.63) five-component entropy-stabilized oxide thin films were deposited on the single-crystal Si (100) substrates by radio frequency magnetron sputtering to study the effect of oxygen content on...
1 CitationsSource
#1Y.H. Wu (TUT: Taiyuan University of Technology)H-Index: 1
#2H.J. Yang (TUT: Taiyuan University of Technology)H-Index: 1
Last. J.W. Qiao (TUT: Taiyuan University of Technology)H-Index: 1
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Abstract High-entropy alloys (HEAs) with a single-phase face-centered cubic (FCC) structure generally have excellent plasticity. However, its limited room temperature strength and hardness result in lower wear resistance, which hinders tribological and engineering applications. In this paper, the pack-boronizing method was used to improve the tribological properties of Al0·1CoCrFeNi HEAs with a single-phase FCC structure. The boronizing treatment was carried out at 900 °C for 2, 4, 6, and 8 h, r...
7 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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Abstract The gradient nanostructured medium entropy alloys (MEAs) exhibit a good yielding strength and great plasticity. Here, the mechanical properties, microstructure, and strain gradient in the gradient nanostructured MEA CrCoNi are studied by atomic simulations. The strong gradient stress and strain always occur in the deformed gradient nanograined MEA CrCoNi. The origin of improving strength is attributed to the formation of the 9R phase, deformation twinning, as well as the fcc to hcp phas...
13 CitationsSource
#1Kang-Tien Hsieh (NTU: National Taiwan University)H-Index: 1
#1Kang-Tien Hsieh (NTU: National Taiwan University)H-Index: 1
Last. Chin-Lung Kuo (NTU: National Taiwan University)H-Index: 1
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Abstract We performed the modified-embedded-atom-method (MEAM) based molecular dynamics (MD) simulations to investigate the plastic deformation and phase transformation behaviors in the CoCrFeMnNi HEA under high compression at room temperature. Our MD simulations revealed that the stress-induced phase transformations in the CoCrFeMnNi HEA are strongly crystal orientation-dependent. The [0 0 1] uniaxial compression can induce the significant face-centered-cubic (fcc) -to-hexagonal-close-packed (h...
5 CitationsSource
#1Fuyu Dong (SUT: Shenyang University of Technology)H-Index: 6
#2Yuan Ye (SUT: Shenyang University of Technology)H-Index: 1
Last. Hongjun Huang (SUT: Shenyang University of Technology)H-Index: 5
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Abstract The high-temperature deformation mechanisms and processing maps of an equiatomic body-centered-cubic(BCC) structured MoNbHfZrTi refractory high-entropy alloy (RHEA) were studied over the temperatures ranging from 1100 to 1250 °C and different strain rates varying from 10−3 to 0.5 s−1. Flow-stress analyses were performed, using an Arrhenius type relation. The activation energy (Q) for high-temperature deformation was calculated as 326.1 kJ/mol, and the related strain rate sensitivity (m)...
4 CitationsSource