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New para-magnetic(CoFeNi)(50)(CrMo)(50-x)(CB)x(x=20,25,30)non-equiatomic high entropy metallic glasses with wide supercooled liquid region and excellent mechanical properties

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Journal of Materials Science & Technology 2020年第8期36卷 135-143页

作者： Jeong Tae ki. Sung Hwan Hong Jin Man Park Jürgen Eckert ki.buem ki. Erich Schmid Institute of Materials Science Austrian Academy of Sciences(ÖAW)Jahnstrae 128700LeobenAustria Hybrid Materials Center(HMC) Department of Nanotechnology and Advanced Materials EngineeringSejong University209Neungdong-roGwangjin-guSeoul143-747Republic of Korea Global Technology Center(GTC) Samsung Electronics Co.Ltd129 Samsung-roYeongtong-guSuwonsiGyeonggi-do443-742Republic of Korea Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 128700LeobenAustria

In this study,high entropy metallic glasses(HEMGs)were developed through a combination of concepts for designing metallic glasses(main element+transition metal+metalloid element)and high-entropy alloys(more than five elements,each element having an atomic concentration between 5 at.%and 35 at.%).The developed metallic glass alloys are composed of Co-Fe-Ni main elements,transition metals(Cr,Mo)and metalloid elements(C,B).Moreover,the present work reports the thermal,mechanical and magnetic properties of(CoFeNi)(50)(CrMo)(50-x)(CB)x alloys with x=20,25,*** developed as-spun HEMGs exhibit typical paramagnetic properties even for a high amount of ferromagnetic elements(Co,Fe,and Ni)and have high elastic modulus(103–160 GPa)and hardness(14–27 GPa),thus possessing mechanical properties similar to well-known Co-based metallic glasses(Co-Cr-Mo-C-B system).In addition,some of the bulk samples prepared with a diameter of 2 mm form bulk metallic glasses with a high compressive strength around 3.5 *** mechanisms determining the stability of the supercooled liquid,as well as the paramagnetic and mechanical properties for the developed non-equiatomic HEMGs,are discussed.

关键词： Metallic glasses Paramagnetism High entropy alloys Phase stability

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Mechanical, deformation and fracture behaviors of bulk metallic glass composites reinforced by spherical B2 particles

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Progress in Natural Science:Materials International 2018年第6期28卷 704-710页

作者： Sung Hwan Hong Jeong Tae ki. Jin Man Park Gian Song Wei-Min Wang ki.buem ki. Department of Nanotechnology and Advanced Materials Engineering Sejong University Erich Schmid Institute of Materials Science Austrian Academy of Sciences Global Technology Center (GTC) Samsung Electronics Co. Ltd. 4. Division of Advanced Materials Engineering Kongju National University 5. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministy of Education Shandong University

Ti45Cu40Ni7Zr5Sn2.5Si0.5alloys were prepared under various cooling rate conditions during *** alloys exhibited different volume fractions of B2 particles with 0～40 vol%in an amorphous *** bulk metallic glass of 1 mm diameter showed no macroscopic plasticity and exhibited the typical vein patterns in a maximum shear stress plane on the fracture ***,a bulk metallic glass composite containing the B2 particles revealed obvious plasticity(～5.6%)with a remarkable work-hardening behavior that resulted from a stress-induced martensitic transformation of the B2 ***,the composite displayed the complicated fracture morphologies containing of three types of fracture *** detailed investigations on the microstructural evolution,mechanical,deformation and fracture characteristics,the influence of B2 particle on overall behavior of the TiCu-based bulk metallic glass composites was elucidated.

关键词： Bulk metallic glass Composite Mechanical properties Martensitic transformation Fracture behavior

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Understanding microstructure and mechanical properties of(AlTa(0.76))xCoCrFeNi(2.1) eutectic high entropy alloys via thermo-physical parameters

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Journal of Materials Science & Technology 2020年第22期54卷 131-137页

作者： Min Jung ki. Gyeol Chan Kang Sung Hwan Hong Hae Jin Park Sang Chul Muna Gian Song ki.buem ki. Department of Nanotechnology and Advanced Materials Engineering Sejong University209 Neungdong-roCwangjin-guSeoul143-747South Korea Division of Advanced Materials Engineering Kongju National UniversityCheonanChungnam330-717South Korea

(AlTa(0.76))xCoCrFeNi(2.1)(x values in molar ratio,x=0.1,0.3,0.5,0.7,1.0,and 1.5) alloys were designed to investigate the microstructure and mechanical properties of the eutectic high entropy alloys(EHEAs)consisting of FCC,B2,and Laves *** on the compositional variatio,clear microstructural variation was observed,as follows:(1) Group 1:FCC dendrite+Laves interdendrite(x=0.1),(2) Group 2:FCC dendrite+fine-eutectic structure consisting of FCC and Laves phases(x=0.3,0.5 and 0.7),(3) Group 3:B2 dendrite+bimodal eutectic structure [FCC/B2+Laves](x=1.0),(4) Group 4:Laves dendrite+eutectic structure consisting of B2 and Laves phases(x=1.5).As the fraction of Laves or B2 phases increases,yield stress increases from 293 to 2336 MPa,while the plastic strain decreases from 50 % to 2%.Thermo-physical parameters,such as mixing entropy(△S(mix)),mixing enthalpy(△H(mix)),valence electron concentration(VEC),and atomic size difference(δr),were calculated to understand the microstructural *** criteria(δr-VEC and δr-△H(mix)) were utilized to elucidate the formation of the eutectic structures in the present EHEAs,revealing the usefulness of the thermo-physical parameters in the development of EHEAs.

关键词： High-entropy alloy Eutectic high-entropy alloy Microstructure Mechanical properties Thermo-physical parameter

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Formation of photo-reactive heterostructure from a multicomponent amorphous alloy with atomically random distribution

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Journal of Materials Science & Technology 2022年第14期109卷 245-253页

作者： Hae Jin Park Hee Jin Lee Tae Kyung ki. Sung Hwan Hong Wei-Min Wang Taek Jib Choi ki.buem ki. Department of Nanotechnology and Advanced Materials Engineering Sejong University209 Neung dong-roGwangjin-guSeoul 05006Republic of Korea Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

In this study,metallic glass is designed tunable for promising functional applications via a facile and stable,one-step *** approach about alloy design and process is based on the unique properties of the Ti-Cu-Ni-Sn metallic glass that are afforded by the varying oxygen affinities of the four constituent *** metallic glass exhibits homogeneous nucleation of oxides and uniform formation of the various metal *** alloy design and hydrothermal synthesis to customize the metallic glasses are the most critical factors that determine the characteristics of the metal oxides and the resulting nanostructures and photoelectrode *** enables the desired element to be selectively grown via a facile single-step *** results provide a promising road map for the application of metallic glasses to photoelectrochemical(PEC)solar water splitting,as well as various other new possibilities.

关键词： Metallic glass Alloy design Hydrothermal synthesis Metal oxide Water splitting

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Evolution of microstructure and mechanical characteristics of(CrFeNiCu)_(100-x)Ti_(x)high-entropy alloys

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Rare Metals 2023年第9期42卷 3088-3098页

作者： Yusupov Dilshodbek Sung Hwang Hong Muhammad Aoun Abbas Gyeol Chan Kang Hae Jin Park Elyorjon Jumaev Wei-Min Wang ki.buem ki. Department of Nanotechnology and Advanced Materials Engineering Sejong UniversitySeoul05006Republic of Korea Almalyk Mountain Mining Complex(MMC) Almalyk City110100Republic of Uzbekistan School of Materials Science and Engineering Shandong UniversityJinan250100China Department of Chemical Engineering New Uzbekistan UniversityTashkent100007Republic of Uzbekistan

Cr Fe Ni Cu)_(100-x)Ti_(x)(x=0,3,5,7 and 10;at%)high-entropy alloys have been designed by the consideration of the thermophysical relationship between Ti and other principal elements to investigate the influence of Ti on the microstructural evolution and mechanical properties of(CrFeNiCu)_(100-x)Ti_(x)high-entropy *** addition of Ti content in HEAs leads to a change in phase formation from dual-phase(FCC1 and FCC2,FCC:face-centered cubic)to the mixture of FCC1,FCC2 phases,and an additional body-centered cubic(BCC)*** yield strength and Vickers hardness of the alloys are enhanced from 291 to 1511 MPa and HV 134 to HV 531,respectively,which depends strongly on the volume fraction of BCC *** the one hand,the plasticity of the alloys reduces from 45.00%to 24.09%,but it could be considered reasonable *** results revealed that the addition of a minor alloying element in high-entropy alloys with consideration of thermophysical parameters led to the formation of a multiple solid solution structure with excellent mechanical properties.

关键词： High-entropy alloy(HEA) Microstructure Mechanical properties Theoretical parameters

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