scholarly journals High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Entropy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 146 ◽  
Author(s):  
Wei-Bing Liao ◽  
Hongti Zhang ◽  
Zhi-Yuan Liu ◽  
Pei-Feng Li ◽  
Jian-Jun Huang ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetron Sputtering ◽  
High Hardness ◽  
Deformation Mechanisms ◽  
High Entropy Alloy ◽  
Alloy Thin Film ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Strength And Deformation

Recently, high-entropy alloy thin films (HEATFs) with nanocrystalline structures and high hardness were developed by magnetron sputtering technique and have exciting potential to make small structure devices and precision instruments with sizes ranging from nanometers to micrometers. However, the strength and deformation mechanisms are still unclear. In this work, nanocrystalline Al0.3CoCrFeNi HEATFs with a thickness of ~4 μm were prepared. The microstructures of the thin films were comprehensively characterized, and the mechanical properties were systematically studied. It was found that the thin film was smooth, with a roughness of less than 5 nm. The chemical composition of the high entropy alloy thin film was homogeneous with a main single face-centered cubic (FCC) structure. Furthermore, it was observed that the hardness and the yield strength of the high-entropy alloy thin film was about three times that of the bulk samples, and the plastic deformation was inhomogeneous. Our results could provide an in-depth understanding of the mechanics and deformation mechanism for future design of nanocrystalline HEATFs with desired properties.

scholarly journals Phase Evolution and Microstructure Analysis of CoCrFeNiMo High-Entropy Alloy for Electro-Spark-Deposited Coatings for Geothermal Environment

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 406 ◽  
Author(s):  
Sigrun N. Karlsdottir ◽  
Laura E. Geambazu ◽  
Ioana Csaki ◽  
Andri I. Thorhallsson ◽  
Radu Stefanoiu ◽  
...  
Keyword(s):  
Bulk Material ◽  
Microstructural Analysis ◽  
Electrochemical Corrosion ◽  
High Hardness ◽  
Phase Evolution ◽  
Vacuum Arc ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
Σ Phase ◽  
High Entropy

In this work, a CoCrFeNiMo high-entropy alloy (HEA) material was prepared by the vacuum arc melting (VAM) method and used for electro-spark deposition (ESD). The purpose of this study was to investigate the phase evolution and microstructure of the CoCrFeNiMo HEA as as-cast and electro-spark-deposited (ESD) coating to assess its suitability for corrosvie environments encountered in geothermal energy production. The composition, morphology, and structure of the bulk material and the coating were analyzed using scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The hardness of the bulk material was measured to access the mechanical properties when preselecting the composition to be pursued for the ESD coating technique. For the same purpose, electrochemical corrosion tests were performed in a 3.5 wt.% NaCl solution on the bulk material. The results showed the VAM CoCrFeNiMo HEA material had high hardness (593 HV) and low corrosion rates (0.0072 mm/year), which is promising for the high wear and corrosion resistance needed in the harsh geothermal environment. The results from the phase evolution, chemical composition, and microstructural analysis showed an adherent and dense coating with the ESD technique, but with some variance in the distribution of elements in the coating. The crystal structure of the as-cast electrode CoCrFeNiMo material was identified as face centered cubic with XRD, but additional BCC and potentially σ phase was formed for the CoCrFeNiMo coating.

High entropy alloy thin films deposited by magnetron sputtering of powder targets

2015 ◽  
Vol 580 ◽  
pp. 71-76 ◽  
Author(s):  
B.R. Braeckman ◽  
F. Boydens ◽  
H. Hidalgo ◽  
P. Dutheil ◽  
M. Jullien ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
High Entropy Alloy ◽  
High Entropy

High hardness dual-phase high entropy alloy thin films produced by interface alloying

2019 ◽  
Vol 162 ◽  
pp. 281-285 ◽  
Author(s):  
Y.P. Cai ◽  
G.J. Wang ◽  
Y.J. Ma ◽  
Z.H. Cao ◽  
X.K. Meng
Keyword(s):  
Thin Films ◽  
High Hardness ◽  
High Entropy Alloy ◽  
Dual Phase ◽  
High Entropy

scholarly journals Molecular dynamics simulation of Al–Co–Cr–Cu–Fe–Ni high entropy alloy thin film growth

2016 ◽  
Vol 68 ◽  
pp. 78-86 ◽  
Author(s):  
Lu Xie ◽  
Pascal Brault ◽  
Anne-Lise Thomann ◽  
Xiao Yang ◽  
Yong Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Film Growth ◽  
Thin Film Growth ◽  
Dynamics Simulation ◽  
High Entropy Alloy ◽  
Alloy Thin Film ◽  
High Entropy

Oxidation of amorphous HfNbTaTiZr high entropy alloy thin films prepared by DC magnetron sputtering

2020 ◽  
pp. 157978
Author(s):  
Petr Hruška ◽  
František Lukáč ◽  
Stanislav Cichoň ◽  
Martin Vondráček ◽  
Jakub Čížek ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
High Entropy Alloy ◽  
Dc Magnetron Sputtering ◽  
High Entropy

scholarly journals Co-introduction of precipitate hardening and TRIP in a TWIP high-entropy alloy using friction stir alloying

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Tianhao Wang ◽  
Shivakant Shukla ◽  
Bharat Gwalani ◽  
Subhasis Sinha ◽  
Saket Thapliyal ◽  
...  
Keyword(s):  
Current Approach ◽  
Deformation Mechanisms ◽  
Engineering Properties ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Friction Stir ◽  
The Matrix ◽  
Face Centered ◽  
Multiple Deformation

AbstractTuning deformation mechanisms is imperative to overcome the well-known strength-ductility paradigm. Twinning-induced plasticity (TWIP), transformation-induced plasticity (TRIP) and precipitate hardening have been investigated separately and have been altered to achieve exceptional strength or ductility in several alloy systems. In this study, we use a novel solid-state alloying method—friction stir alloying (FSA)—to tune the microstructure, and a composition of a TWIP high-entropy alloy by adding Ti, and thus activating site-specific deformation mechanisms that occur concomitantly in a single alloy. During the FSA process, grains of the as-cast face-centered cubic matrix were refined by high-temperature severe plastic deformation and, subsequently, a new alloy composition was obtained by dissolving Ti into the matrix. After annealing the FSA specimen at 900 °C, hard Ni–Ti rich precipitates formed to strengthen the alloy. An additional result was a Ni-depleted region in the vicinity of newly-formed precipitates. The reduction in Ni locally reduced the stacking fault energy, thus inducing TRIP-based deformation while the remaining matrix still deformed as a result of TWIP. Our current approach presents a novel microstructural architecture to design alloys, an approach that combines and optimizes local compositions such that multiple deformation mechanisms can be activated to enhance engineering properties.

Investigation of structure and mechanical properties of TiZrHfNiCuCo high entropy alloy thin films synthesized by magnetron sputtering

2019 ◽  
Vol 797 ◽  
pp. 834-841 ◽  
Author(s):  
Young Seok Kim ◽  
Hae Jin Park ◽  
Sang Chul Mun ◽  
Elyorjon Jumaev ◽  
Sung Hwan Hong ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Magnetron Sputtering ◽  
High Entropy Alloy ◽  
High Entropy

Research on Electromagnetic Properties of High Entropy Alloys

2013 ◽  
Vol 837 ◽  
pp. 277-282 ◽  
Author(s):  
Iulia Florea ◽  
Raluca Maria Florea ◽  
Oana Bălţătescu ◽  
Vasile Soare ◽  
Costel Roman ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Hardness ◽  
Electromagnetic Properties ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Face Centered Cubic ◽  
Metallic Elements ◽  
High Entropy ◽  
Good Thermal Stability ◽  
Structural Applications

In 1995, Yeh suggested the formation of an alloy made up of at least five metallic elements which have large mixing entropy solutions with many elements forming solide alloys. This alloy appeared because traditional alloys are characteised by high fragility and are difficult to process. High entropy alloys are alloys which have approximately equal concentrations, formed by a group of 5 to 11 elements majority in composition, mole fraction of each major metallic element in the alloy is between 5% and 30%. During the research it has been proved that this alloy has a high hardness and it is also corrosion proof and also resistance and good thermal stability It should be mentioned that High Entropy Alloys are characterized as alloys consisting of roughly equal concentrations of at least five metallic elements and are claimed to favor close-packed, disordered structures due to high configurational entropy. Such crystal structures, e.g. face-centered cubic (FCC), are advantageous in that they should offer multiple active slip systems usually observed in ductile metals and alloys. This opens the door to a large number of rich chemistries which would otherwise contain unacceptable volume fractions of intermetallic compounds to be useful in structural applications That way in this paper will carry out research to one specific high entropy alloy, we analyze the physical, chemical, electrical, magnetic, corrosion resistance of these materials, heat treatments corresponding and plastic deformation. This paper is divided into several chapters which will present application domains, and also a number of conclusions. Key words : high entropy alloys, properties of alloys, application domains, corrosion proof, thermal stability

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