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 1104
#1Rui Feng (UT: University of Tennessee)H-Index: 14
Catastrophic accidents caused by fatigue failures often occur in engineering structures. Thus, a fundamental understanding of cyclic-deformation and fatigue-failure mechanisms is critical for the development of fatigue-resistant structural materials. Here we report a high-entropy alloy with enhanced fatigue life by ductile-transformable multicomponent B2 precipitates. Its cyclic-deformation mechanisms are revealed by real-time in-situ neutron diffraction, transmission-electron microscopy, crysta...
#2S. P. Pan (TUT: Taiyuan University of Technology)H-Index: 1
#3Y.J. Zhang (USTB: University of Science and Technology Beijing)H-Index: 11
High-entropy alloy is an alloy design concept without a principal component. This concept not only refers to the complexity of alloy compositions but also means that when the high-entropy alloy transits from a high-energy state to low-energy state, there will be more intermediate metastable states. Corresponding to different states are the changes in the degree and manner of order in the microstructure. In this study, we used machine learning to combine elemental characteristics with long-term o...
Abstract null null The nitrided layer on Ni45(CoCrFe)40(AlTi)15 high-entropy alloys (HEAs) was prepared by plasma nitriding. The microstructure, hardness, the effect of temperature on the tribological properties and adhesive strength of the nitride layer were investigated. The results revealed that the as-cast alloy was composed of a single FCC phase, and the hardness measured by nano-indentation was 8.8 GPa. After nitriding, the hard phases, such as AlN, CrN, Fe3N, and TiN, appeared, the surfac...
#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...
#1Mingkang Wang (DUT: Dalian University of Technology)
#2Junhao Yuan (DUT: Dalian University of Technology)
Last. Peter K. Liaw (UT: University of Tennessee)H-Index: 94
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The present work investigated the formation and mechanical behavior of body-centered-cubic (BCC) Zr(Hf)-Nb-Ti medium entropy alloys (MEAs), in which three series of alloys, [Zr-Zr14](Zr,Nb)3, [Ti-Zr14](Ti,Nb)3, and [Ti-(Hf,Zr)14](Nb)3, were designed by the cluster formula approach. With increasing the Nb content, the BCC-β structural stability of the [Zr-Zr14](Zr,Nb)3 alloys would be enhanced, as evidenced by the BCC [Zr-Zr14](Nb)3 (Zr83.33Nb16.67 in atomic percent at. pct) alloy containing a mi...
#1Md. R. U. Ahsan (Tennessee Technological University)H-Index: 5
#2Xuesong Fan (UT: University of Tennessee)H-Index: 4
Last. Duck Bong Kim (Tennessee Technological University)H-Index: 11
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Abstract Bimetallic additively manufactured structures (BAMSs) can replace traditionally-fabricated functionally-graded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from post-processing. The present work fabricates a BAMS by sequentially depositing the austenitic stainless-steel and Inconel625 using a gas-metal-arc-welding (GMAW)-based wire + arc additive manufacturing (WAAM) system. Elemental mapping shows a smooth compositiona...
1 CitationsSource
#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)
#2M. L. Bao (TUT: Taiyuan University of Technology)H-Index: 1
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...
2 CitationsSource
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...