scholarly journals Surface Tension of GaInSnBiZn Liquid High-entropy Alloy

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
Shirong Zhu ◽  
Lu Liu ◽  
Qiaoli Lin
Keyword(s):  
Surface Tension ◽  
Thermodynamic Characteristics ◽  
Surface Concentration ◽  
Theoretical Models ◽  
High Entropy Alloy ◽  
Alloy Formation ◽  
High Entropy ◽  
General Solution Model ◽  
Alloy Material ◽  
Potential Applications

As an emerging alloy material, high-entropy alloy has potential applications that distinguish it from traditional alloys due to its special physicochemical properties. In this work, a low melting point GaInSnBiZn high-entropy alloy was designed based on Miedema model, and its surface tension was measured by the continuous pendant-drop method. The results show that the intrinsic surface tension of GaInSnBiZn high-entropy alloy at 80 °C is 545±5 mN/m, and the surface tension of the liquid alloy is significantly reduced by the formation of surface oxide film. The surface tension of GaInSnBiZn high-entropy alloy was analyzed by using theoretical models (Guggenheim model, GSM (general solution) model and Butler model), and the thermodynamic characteristics of the surface tension formation were further verified by combining with thermodynamic calculations, among which the calculated results of Butler model were in good agreement with the experimental data. Meanwhile, it is found that the surface concentration of Bi in the alloy is much larger than the nominal concentration of its bulk phase, which contributes the most to the surface tension of the alloy, however, it contributes the least to the entropy of the alloy formation in combination with the Butler model.

High Entropy Based Composites - An Overview

2019 ◽  
Vol 969 ◽  
pp. 98-103
Author(s):  
T. Ram Prabhu ◽  
Yash Chodancar ◽  
M. Arivarasu ◽  
N. Arivazhagan ◽  
R.K. Mishra
Keyword(s):  
Solid Solution ◽  
Short Note ◽  
Atomic Ratio ◽  
Fatigue Properties ◽  
High Entropy Alloy ◽  
Matrix Composites ◽  
Essential Information ◽  
High Entropy ◽  
Potential Applications ◽  
Processing Techniques

High entropy alloy (HEA) is a new class of alloy that has a different alloy design concept over the conventional dilute alloys. In this alloy, the alloying elements have an equi-atomic ratio that helps to increase the entropy of the alloy to stabilize the simple solid solution (BCC, FCC and HCP) over the intermetallics. The stabilization of solid solution improves the paradoxial properties such as strength and toughness. High thermal stability, excellent creep and fatigue properties, outstanding corrosion resistance are the attractive features of HEA. Recently, the HEA is explored as a matrix or particle in the metal matrix composites. Research studies on HEA based composites are plenty and scattered. In this work, we attempt to collate essential information in the HEA based composites. The overview covers (1) processing techniques, (2) microstructure characterization and (3) the mechanical properties in detail. A short note on the potential applications of HEA based composites is also proposed.

Hexagonal close-packed high-entropy alloy formation under extreme processing conditions

2019 ◽  
Vol 34 (5) ◽  
pp. 709-719 ◽  
Author(s):  
Ram Devanathan ◽  
Weilin Jiang ◽  
Karen Kruska ◽  
Michele A. Conroy ◽  
Timothy C. Droubay ◽  
...  
Keyword(s):  
High Entropy Alloy ◽  
Alloy Formation ◽  
Processing Conditions ◽  
High Entropy ◽  
Hexagonal Close Packed ◽  
Image Position

Abstract

scholarly journals Mechanical and Magnetic Properties of the High-Entropy Alloys for Combinatorial Approaches

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 200 ◽  
Author(s):  
E-Wen Huang ◽  
Guo-Yu Hung ◽  
Soo Yeol Lee ◽  
Jayant Jain ◽  
Kuan-Pang Chang ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Thermal Spray Coatings ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Spray Coatings ◽  
Wear And Corrosion ◽  
Potential Applications ◽  
Magnetic Applications ◽  
Alloy Properties

This review summarizes the state of high-entropy alloys and their combinatorial approaches, mainly considering their magnetic applications. Several earlier studies on high-entropy alloy properties, such as magnetic, wear, and corrosion behavior; different forms, such as thin films, nanowires, thermal spray coatings; specific treatments, such as plasma spraying and inclusion effects; and unique applications, such as welding, are summarized. High-entropy alloy systems that were reported for both their mechanical and magnetic properties are compared through the combination of their Young’s modulus, yield strength, remanent induction, and coercive force. Several potential applications requiring both mechanical and magnetic properties are reported.

Molecular Dynamics Study on the Diffusion Process of AuAgCuNiPd High-entropy Alloy Metallurgy Induced by Pulsed Laser Heating

2021 ◽  
Author(s):  
Gen Lin ◽  
Jianwu Guo ◽  
Pengfei Ji
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Laser Heating ◽  
Pulsed Laser ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Alloy Material ◽  
Wide Range ◽  
Pulsed Laser Heating

As a novel alloy material with outstanding mechanical properties, high-entropy alloys have a wide range of promising applications. By establishing individual Au, Ag, Cu, Ni, and Pd nanolaminates with faced-centered-cubic...

scholarly journals The formation and stability of bulk amorphous and high entropy alloys

2021 ◽  
Vol 4 (1) ◽  
pp. 51-57
Author(s):  
Attila Szabó ◽  
Krisztián Bán ◽  
József Hlinka ◽  
Judit Pásztor ◽  
Antal Lovas
Keyword(s):  
Amorphous Alloys ◽  
Configurational Entropy ◽  
Temperature Stability ◽  
High Entropy Alloy ◽  
Alloy Formation ◽  
High Entropy Alloys ◽  
High Temperature Stability ◽  
High Entropy ◽  
Phase Stabilization ◽  
Fcc Phase

Abstract Two kinds of phase stabilization mechanism are discussed and compared: the first is characteristic of the formation of bulk amorphous alloys, in which the high supercooling ability of multicomponent liquids is responsible for the glassy phase stabilization. Here the hindered nucleation of crystalline phases is the center phenomenon. The origin of this hindering is the slowing atomic mobility in the supercooling melt. In contrast the melt supercooling is negligible during the high entropy alloy formation. It is believed that stability of the crystalline single fcc phase is the consequence of the characteristic of high configurational entropy at high temperatures. However, the significance of this entropy-dominated stabilization is overestimated in several references. It has been concluded that transition metal contraction (arising from the d electron participation in the overall bonding state) does also contribute to the high temperature stability of fcc single phase in the high entropy alloys.

scholarly journals In-Situ Alloy Formation of a WMoTaNbV Refractory Metal High Entropy Alloy by Laser Powder Bed Fusion (PBF-LB/M)

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3095
Author(s):  
Florian Huber ◽  
Dominic Bartels ◽  
Michael Schmidt
Keyword(s):  
Electron Microscopy ◽  
Refractory Metal ◽  
High Entropy Alloy ◽  
Alloy Formation ◽  
High Entropy Alloys ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
High Entropy

High entropy or multi principal element alloys are a promising and relatively young concept for designing alloys. The idea of creating alloys without a single main alloying element opens up a wide space for possible new alloy compositions. High entropy alloys based on refractory metals such as W, Mo, Ta or Nb are of interest for future high temperature applications e.g., in the aerospace or chemical industry. However, producing refractory metal high entropy alloys by conventional metallurgical methods remains challenging. For this reason, the feasibility of laser-based additive manufacturing of the refractory metal high entropy alloy W20Mo20Ta20Nb20V20 by laser powder bed fusion (PBF-LB/M) is investigated in the present work. In-situ alloy formation from mixtures of easily available elemental powders is employed to avoid an expensive atomization of pre-alloyed powder. It is shown that PBF-LB/M of W20Mo20Ta20Nb20V20 is in general possible and that a complete fusion of the powder mixture without a significant number of undissolved particles is achievable by in-situ alloy formation during PBF-LB/M when selecting favorable process parameter combinations. The relative density of the samples with a dimension of 6 × 6 × 6 mm3 reaches, in dependence of the PBF-LB/M parameter set, 99.8%. Electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) measurements confirm the presence of a single bcc-phase. Scanning electron microscopy (SEM) images show a dendritic and/or cellular microstructure that can, to some extent, be controlled by the PBF-LB/M parameters.

Сoating of a multicomponent system Al–Cr–Ni–Co–Fe on a steel substrate obtained by laser

2021 ◽  
pp. 109-117
Author(s):  
R. Yu. Bystrov ◽  
D. A. Gerashchenkov
Keyword(s):  
Mechanical Properties ◽  
Steel Substrate ◽  
Multicomponent System ◽  
Thermodynamic Characteristics ◽  
Physical And Mechanical Properties ◽  
High Energy ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Equimolar Composition ◽  
System A

In recent years, the unique physical and mechanical properties of high-entropy alloys (HEAs) have been the subject of increased attention of researchers. The study of the thermodynamic characteristics of such materials may be of interest for formulating the principles of the formation of structures with the required functional characteristics. Since the processes of structure and phase formation, as well as the diffusion mobility of atoms, the mechanism for the formation of mechanical properties and thermal stability differ significantly from similar processes in traditional alloys, HEAs are singled out into a special group of materials.The article presents a brief overview of the results of obtaining a high-entropy alloy by the combined method. At the first stage, a precursor layer was deposited by сold gas dynamic spraying (CGDS), and at the second stage, it was subjected to high-energy action using a laser. An alloy of the Al-Cr-Ni-Co-Fe type has been studied. By varying the ratio of the components, it was possible to obtain an almost equimolar composition for this system. A prediction of properties and structure is made based on the phase composition of the system.

New High Entropy Alloy for Biomedical Applications

2017 ◽  
Vol 750 ◽  
pp. 180-183 ◽  
Author(s):  
Brandusa Ghiban ◽  
Gabriela Popescu ◽  
Daniela Dumitrescu ◽  
Vasile Soare
Keyword(s):  
Biomedical Applications ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Metallic Materials ◽  
Corrosion Properties ◽  
High Entropy ◽  
New Class ◽  
Potential Applications ◽  
High Degree ◽  
Oxidation And Corrosion

High Entropy Alloys (HEAs) represent a new concept of metallic materials, that contain 5 or more elements, in proportions from 5 at.% to 35 at.%, and form simple solid solutions (BCC and/or FCC) instead of complicated intermetallic phases. The high degree of randomness atomic HEA, gives them excellent properties: electrical, mechanical, electrochemical, ductility, anti-corrosion properties, stable structure etc, with applications in peak thus representing a growing research. These specific features provides HEA with excellent hardness, strength and wear strength, malleability, oxidation and corrosion resistance, with potential applications in diverse industrial areas [1÷4]. Considering these properties we decide to improve biomedical alloys with this new class of HEAs.

scholarly journals Microstructure and Thermal Analysis of Metastable Intermetallic Phases in High-Entropy Alloy CoCrFeMo0.85Ni

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1073
Author(s):  
Zihui Dong ◽  
Dmitry Sergeev ◽  
Michael F. Dodge ◽  
Francesco Fanicchia ◽  
Michael Müller ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Single Phase ◽  
Intermetallic Phases ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Potential Applications ◽  
Thermal Stability Of ◽  
Liquidus Temperatures

CoCrFeMoNi high entropy alloys (HEAs) exhibit several promising characteristics for potential applications of high temperature coating. In this study, metastable intermetallic phases and their thermal stability of high-entropy alloy CoCrFeMo0.85Ni were investigated via thermal and microstructural analyses. Solidus and liquidus temperatures of CoCrFeMo0.85Ni were determined by differential thermal analysis as 1323 °C and 1331 °C, respectively. Phase transitions also occur at 800 °C and 1212 °C during heating. Microstructure of alloy exhibits a single-phase face-centred cubic (FCC) matrix embedded with the mixture of (Co, Cr, Fe)-rich tetragonal phase and Mo-rich rhombohedron-like phase. The morphologies of two intermetallics show matrix-based tetragonal phases bordered by Mo-rich rhombohedral precipitates around their perimeter. The experimental results presented in our paper provide key information on the microstructure and thermal stability of our alloy, which will assist in the development of similar thermal spray HEA coatings.

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