scholarly journals HIGH-ENTROPY ALLOYS AS A PROSPECTIVE CLASS OF NEW RADIATION-TOLERANT MATERIALS RESEARCH DEVELOPMENT ANALYSIS BASED ON THE INFORMATION DATABASES

2021 ◽  
pp. 3-15
Author(s):  
A.V. Levenets ◽  
M.A. Tikhonovsky ◽  
V.N. Voyevodin ◽  
A.G. Shepelev ◽  
O.V. Nemashkalo
Keyword(s):  
Radiation Damage ◽  
Exponential Growth ◽  
High Entropy Alloys ◽  
Research Development ◽  
Metallic Materials ◽  
High Entropy ◽  
New Class ◽  
Materials Research ◽  
Development Analysis ◽  
Radiation Tolerant

A new class of metallic materials, so-called “high-entropy alloys” (HEAs), was under review. Various definitions of these alloys are given, their main differences from the conventional alloys are indicated and the dynamics of publications in the period from the first publications in 2004 to the end of 2020 are presented. It is noted the almost exponential growth of the article numbers concerning these alloys, and the main reasons of such high interest are discussed. Experimental results of development the radiation-tolerant materials based on the concept of high-entropy alloys and study of the radiation damage mechanisms are summarised.

scholarly journals High-Pressure Induced Phase Transitions in High-Entropy Alloys: A Review

Entropy ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 239 ◽  
Author(s):  
Fei Zhang ◽  
Hongbo Lou ◽  
Benyuan Cheng ◽  
Zhidan Zeng ◽  
Qiaoshi Zeng
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Future Research ◽  
High Entropy Alloys ◽  
High Entropy ◽  
New Class ◽  
Materials Research ◽  
The Stability ◽  
Irreversible Phase Transitions

High-entropy alloys (HEAs) as a new class of alloy have been at the cutting edge of advanced metallic materials research in the last decade. With unique chemical and topological structures at the atomic level, HEAs own a combination of extraordinary properties and show potential in widespread applications. However, their phase stability/transition, which is of great scientific and technical importance for materials, has been mainly explored by varying temperature. Recently, pressure as another fundamental and powerful parameter has been introduced to the experimental study of HEAs. Many interesting reversible/irreversible phase transitions that were not expected or otherwise invisible before have been observed by applying high pressure. These recent findings bring new insight into the stability of HEAs, deepens our understanding of HEAs, and open up new avenues towards developing new HEAs. In this paper, we review recent results in various HEAs obtained using in situ static high-pressure synchrotron radiation x-ray techniques and provide some perspectives for future research.

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 Ultrastrong lightweight compositionally complex steels via dual-nanoprecipitation

2020 ◽  
Vol 6 (46) ◽  
pp. eaba9543 ◽  
Author(s):  
Zhangwei Wang ◽  
Wenjun Lu ◽  
Huan Zhao ◽  
Christian H. Liebscher ◽  
Junyang He ◽  
...  
Keyword(s):  
High Performance ◽  
Energy Savings ◽  
Tensile Elongation ◽  
High Strength ◽  
Metallic Materials ◽  
Principal Element ◽  
High Entropy ◽  
Solid Solution Strengthening ◽  
New Class ◽  
Solution Strengthening

High-performance lightweight materials are urgently needed, given the pressing quest for weight reduction and the associated energy savings and emission reduction. Here, by incorporating the multi–principal element feature of compositionally complex alloys, we develop the concept of lightweight steels further and propose a new class of compositionally complex steels (CCSs). This approach allows us to use the high solid solution strengthening and shift the alloys’ compositions into previously unattainable phase regions where both nanosized shearable κ-carbides and non-shearable B2 particles are simultaneously formed. The achievement of dual-nanoprecipitation in our CCSs leads to materials with ultrahigh specific tensile strength (up to 260 MPa·cm3 g−1) and excellent tensile elongation (13 to 38%), a combination outperforming all other high-strength high-entropy alloys and advanced lightweight steels. Our concept of CCSs is thus useful for guiding the design of ultrastrong lightweight metallic materials.

scholarly journals Compositional and structural origins of radiation damage mitigation in high-entropy alloys

2020 ◽  
Vol 128 (12) ◽  
pp. 125904
Author(s):  
M. A. Cusentino ◽  
M. A. Wood ◽  
R. Dingreville
Keyword(s):  
Radiation Damage ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Damage Mitigation

scholarly journals High Entropy Alloys Manufactured by Additive Manufacturing

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 639 ◽  
Author(s):  
José M. Torralba ◽  
Mónica Campos
Keyword(s):  
Additive Manufacturing ◽  
Review Paper ◽  
Physical Metallurgy ◽  
High Entropy Alloys ◽  
Metallic Materials ◽  
Processing Conditions ◽  
High Entropy ◽  
New Material ◽  
Manufacturing Technologies ◽  
Structure And Microstructure

High entropy alloys have attracted much interest over the last 16 years due to their promising an unusual properties in different fields that offer many new possible application. Additionally, additive manufacturing has drawn attention due to its versatility and flexibility ahead of a new material challenge, being a suitable technology for the development of metallic materials. Moreover, high entropy alloys have demonstrated that many gaps exist in the literature on its physical metallurgy, and in this sense, additive manufacturing could be a feasible technology for solving many of these challenges. In this review paper the newest literature on this topic is condensed into three different aspects: the different additive manufacturing technologies employed to process high entropy alloys, the influence of the processing conditions and composition on the expected structure and microstructure and information about the mechanical and corrosion behavior of these alloys.

High-entropy alloys in light transition metal systems

2014 ◽  
Vol 70 (a1) ◽  
pp. C943-C943
Author(s):  
Roksolana Kozak ◽  
Walter Steurer
Keyword(s):  
Single Phase ◽  
Elevated Temperatures ◽  
High Hardness ◽  
High Entropy Alloys ◽  
X Ray Diffraction ◽  
High Entropy ◽  
Mixing Entropy ◽  
Al Content ◽  
New Class ◽  
Arc Melting

High-entropy alloys (HEAs) are a new class of alloys designed with the approach of maximization of configurational mixing entropy by increasing the number of constituents [1,2]. Alloys produced in such a way are reported for a variety of promising properties (high hardness and strength, wear resistance, magnetism etc.) [3]. However, origin of these properties (microstructure, phase content, element composition, thermal history) is not always clear. High mixing entropy in HEAs favours the formation of single-phase substitutional solid solutions at elevated temperatures with approximately equiatomic compositions and simple average crystal structures of either the cF4-Cu (fcc) or the cI2-W (bcc). Nevertheless, only a few element combinations produce truly single-phase materials. In order to search for new HEAs compositions samples in the systems Cr-Fe-Co-Ni-Al and Cr-Fe-Co-Ni-Mn were synthesized by arc melting and homogenized in tantalum ampoules at 1100 and 1300 °C for 2 weeks. DTA, X-ray diffraction and electron microscopy measurements were performed. Only samples with small Al content (~ 5 at.%) showed the single-phase microstructure. Their local atomic structure is under investigation.

High Entropy Alloys: From Bulk Metallic Materials to Nanoparticles

2018 ◽  
Vol 49 (10) ◽  
pp. 4986-4990 ◽  
Author(s):  
Qingfeng Wu ◽  
Zhijun Wang ◽  
Feng He ◽  
Lilin Wang ◽  
Jie Luo ◽  
...  
Keyword(s):  
High Entropy Alloys ◽  
Metallic Materials ◽  
High Entropy
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