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
#1Biao Ding (SHU: Shanghai University)H-Index: 3
#2Weili Ren (SHU: Shanghai University)H-Index: 18
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract High total strain-controlled creep-fatigue tests of 1.8% were performed for a directionally-solidified Ni-based superalloy, DZ445, at 900 °C in air. Dwell times of 0, 2, and 5 min. were introduced at the tensile peak strain for each cycle. Experimental results show a decrease in fatigue life with increasing dwell time. The significant cyclic softening is observed after the application of the dwell time. The mean compressive stress and large plastic-strain accumulation are produced due t...
#1Yi ChouH-Index: 4
#2Chanho Lee (UT: University of Tennessee)H-Index: 12
Last. Yi-Chia ChouH-Index: 14
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High annular angle dark field-scanning transmission electron microscopy (HAADF-STEM) was used to directly measure the lattice distortion of NbTaTiV and NbTaTiVZr by fitting the images with a two-dimensional (2-D) Gauss function. The effect of the scanning direction and the accuracy of the HAADF-STEM method were discussed, and the lattice distortion factors in NbTaTiV and NbTaTiVZr were 0.113 and 0.155 A, respectively.
#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 ...
#1Hao Huang (USTB: University of Science and Technology Beijing)
#2Peter K. Liaw (UT: University of Tennessee)H-Index: 94
Last. Yong Zhang (USTB: University of Science and Technology Beijing)H-Index: 112
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A controlled wrinkled structure is a simple and effective approach to achieve unique properties and has been widely used in flexible materials. In this study, we reported a substrate prestrain method for fabricating wrinkle-structured Zr52Ti34Nb14 multiple-basis-element (MBE) alloy films as biocompatible materials. Variations in the film thickness and substrate prestraining enabled a precise control of the amplitude and wavelength of the wrinkled structures, ranging from micrometers to nanometer...
#1Z. Wang (TUT: Taiyuan University of Technology)
#1Zhiming Wang (Lancaster University)H-Index: 66
Last. Junwei Qiao (TUT: Taiyuan University of Technology)H-Index: 29
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Single-phase hexagonal close-packed structure of the ScYLaGdTbDyHoErLu high-entropy alloy was studied in detail. The applicability of the rule of mixture was analyzed with respect to the lattice constant, mechanical parameters, elastic properties, melting point, and hardness of the alloy. Significant tension-compression asymmetry has been found and explained by the strength differential effect during the uniaxial tests. Numerous deformation twins and high densities of stacking faults can be obse...
#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...
9 CitationsSource
#1Chenhe Wang (Beihang University)
#2Nengbin Hua (Fujian University of Technology)H-Index: 15
Last. Tao Zhang (Beihang University)H-Index: 4
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Ti47Cu38−xZr7.5Fe2.5Sn2Si1Ag2Pdx (x = 1, 2, 3, and 4 atomic percent, at. pct) bulk metallic glasses (BMGs) with potential for biomedical applications were fabricated by copper-mold casting. The Ti-based BMGs exhibited high glass-forming ability (GFA) with critical diameters of 4 to 5 mm and a supercooled liquid region over 50 K, though the high contents of Pd slightly decreased the GFA. The additions of 2 and 3 at. pct Pd benefited the improvement of plasticity, and the resultant BMGs showed the...
#1Wangying Yu (USST: University of Shanghai for Science and Technology)
#2Wei Li (USST: University of Shanghai for Science and Technology)H-Index: 16
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract The multi-component (AlCrTiZrMo)-Six-N high-entropy films with different silicon contents were deposited on the silicon substrate by magnetron sputtering. The influence of silicon contents on the structures and properties of the films was studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), electron probe microanalyzer (EPMA) and nanoindentation. The results show that the (AlCrTiZrMo)N film without sil...
#1Nengbin Hua (Fujian University of Technology)H-Index: 15
#1Nengbin Hua (Fujian University of Technology)H-Index: 2
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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Abstract The microstructures, mechanical, corrosion, and wear behaviors of the TixZrNbTaMo (x = 0.5, 1, 1.5, and 2, molar ratio) high entropy alloys (HEAs) were studied. It was found that the Ti–Zr–Nb–Ta–Mo HEAs showed a dendrite structure with two body-centered-cubic (BCC) solid solution phases. The Ti0.5ZrNbTaMo HEA exhibited a high hardness of about 500 HV, high compressive strength approaching 2,600 MPa, and large plastic strain of over 30%. Furthermore, the highly-protective oxide films for...
23 CitationsSource
Last. Gian SongH-Index: 16
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Single-phase solid-solution refractory high-entropy alloys (RHEAs) have been receiving significant attention due to their excellent mechanical properties and phase stability at elevated temperatures. Recently, many studies have been reported regarding the precipitation-enhanced alloy design strategy to further improve the mechanical properties of RHEAs at elevated temperatures. In this study, we attempted to develop precipitation-hardened light-weight RHEAs via addition of Ni or Co into Al0.8NbT...