Solid solution softening in a Al0.1CoCrFeMnNi high-entropy alloy

2020 ◽  
Vol 186 ◽  
pp. 63-68 ◽  
Author(s):  
Q. Cheng ◽  
X.D. Xu ◽  
X.Q. Li ◽  
Y.P. Li ◽  
T.G. Nieh ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Solid Solution Softening

scholarly journals Nanoporous Quasi-High-Entropy Alloy Microspheres

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 345 ◽  
Author(s):  
Lianzan Yang ◽  
Yongyan Li ◽  
Zhifeng Wang ◽  
Weimin Zhao ◽  
Chunling Qin
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Hierarchical Porous

High-entropy alloys (HEAs) present excellent mechanical properties. However, the exploitation of chemical properties of HEAs is far less than that of mechanical properties, which is mainly limited by the low specific surface area of HEAs synthesized by traditional methods. Thus, it is vital to develop new routes to fabricate HEAs with novel three-dimensional structures and a high specific surface area. Herein, we develop a facile approach to fabricate nanoporous noble metal quasi-HEA microspheres by melt-spinning and dealloying. The as-obtained nanoporous Cu30Au23Pt22Pd25 quasi-HEA microspheres present a hierarchical porous structure with a high specific surface area of 69.5 m2/g and a multiphase approximatively componential solid solution characteristic with a broad single-group face-centered cubic XRD pattern, which is different from the traditional single-phase or two-phase solid solution HEAs. To differentiate, these are named quasi-HEAs. The synthetic strategy proposed in this paper opens the door for the synthesis of porous quasi-HEAs related materials, and is expected to promote further applications of quasi-HEAs in various chemical fields.

A review on phase prediction in high entropy alloys

2021 ◽  
pp. 095440622110089
Author(s):  
Vinay Kumar Soni ◽  
S Sanyal ◽  
K Raja Rao ◽  
Sudip K Sinha
Keyword(s):  
Solid Solution ◽  
Phase Formation ◽  
Single Phase ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Modeling Tools ◽  
High Entropy ◽  
Recent Developments ◽  
Phase Prediction ◽  
The Stability

The formation of single phase solid solution in High Entropy Alloys (HEAs) is essential for the properties of the alloys therefore, numerous approach were proposed by many researchers to predict the stability of single phase solid solution in High Entropy Alloy. The present review examines some of the recent developments while using computational intelligence techniques such as parametric approach, CALPHAD, Machine Learning etc. for prediction of various phase formation in multicomponent high entropy alloys. A detail study of this data-driven approaches pertaining to the understanding of structural and phase formation behaviour of a new class of compositionally complex alloys is done in the present investigation. The advantages and drawbacks of the various computational are also discussed. Finally, this review aims at understanding several computational modeling tools complying the thermodynamic criteria for phase formation of novel HEAs which could possibly deliver superior mechanical properties keeping an aim at advanced engineering applications.

Solid State Amorphization and Alloy Parameters for High Entropy Alloys

2021 ◽  
Vol 1016 ◽  
pp. 990-996
Author(s):  
Takeshi Nagase
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Intermetallic Compounds ◽  
Electron Irradiation ◽  
Fast Electron ◽  
High Entropy Alloy ◽  
Solid Solution Formation ◽  
High Entropy ◽  
Solution Formation ◽  
State Amorphization

Fast electron irradiation can induce the solid-state amorphization (SSA) of many intermetallic compounds. The occurrence of SSA stimulated by fast electron irradiation was found in the Al0.5TiZrPdCuNi high-entropy alloy (HEA). The relationship between the occurrence of SSA in intermetallic compounds under fast electron irradiation and the empirical alloy parameters for predicting the solid-solution-formation tendency in HEAs was discussed. The occurrence of SSA in intermetallic compounds was hardly predicted, only by the alloy parameters of δ or ΔHmix, which have been widely used for predicting solid-solution formation in HEAs. All intermetallic compounds with ΔHmix ≤ -35 kJ/mol and those with δ ≥ 12.5 exhibit the occurrence of SSA. This implies that the intermetallic compounds with a largely negative ΔHmix value and a largely positive δ parameter are favorable for the occurrence of SSA.

scholarly journals Refractory High-Entropy HfTaTiNbZr-Based Alloys by Combined Use of Ball Milling and Spark Plasma Sintering: Effect of Milling Intensity

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1268 ◽  
Author(s):  
Natalia Shkodich ◽  
Alexey Sedegov ◽  
Kirill Kuskov ◽  
Sergey Busurin ◽  
Yury Scheck ◽  
...  
Keyword(s):  
Solid Solution ◽  
Ball Milling ◽  
Spark Plasma Sintering ◽  
Vickers Hardness ◽  
High Energy ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Energy Ball

For the first time, a powder of refractory body-centered cubic (bcc) HfTaTiNbZr-based high-entropy alloy (RHEA) was prepared by short-term (90 min) high-energy ball milling (HEBM) followed by spark plasma sintering (SPS) at 1300 °C for 10 min and the resultant bulk material was characterized by XRD and SEM/EDX. The material showed ultra-high Vickers hardness (10.7 GPa) and a density of 9.87 ± 0.18 g/cm³ (98.7%). Our alloy was found to consist of HfZrTiTaNb-based solid solution with bcc structure as a main phase, a hexagonal closest packed (hcp) Hf/Zr-based solid solution, and Me2Fe phases (Me = Hf, Zr) as minor admixtures. Principal elements of the HEA phase were uniformly distributed over the bulk of HfTaTiNbZr-based alloy. Similar alloys synthesized without milling or in the case of low-energy ball milling (LEBM, 10 h) consisted of a bcc HEA and a Hf/Zr-rich hcp solid solution; in this case, the Vickers hardness of such alloys was found to have a value of 6.4 GPa and 5.8 GPa, respectively.

A comparative study of a solid solution hardening in carbon-alloyed FeMnCrNiCo0.95C0.05 high-entropy alloy subjected to different thermal–mechanical treatments

2020 ◽  
pp. 129073
Author(s):  
Elena Astafurova ◽  
Evgenii Melnikov ◽  
Sergey Astafurov ◽  
Kseniya Reunova ◽  
Marina Panchenko ◽  
...  
Keyword(s):  
Solid Solution ◽  
Comparative Study ◽  
Solid Solution Hardening ◽  
High Entropy Alloy ◽  
Solution Hardening ◽  
High Entropy

Monocrystalline elastic constants of fcc-CrMnFeCoNi high entropy alloy

MRS Advances ◽  
2017 ◽  
Vol 2 (27) ◽  
pp. 1429-1434 ◽  
Author(s):  
Katsushi Tanaka ◽  
Takeshi Teramoto ◽  
Ryo Ito
Keyword(s):  
Solid Solution ◽  
Elastic Constants ◽  
Room Temperature ◽  
Entropy Change ◽  
High Entropy Alloy ◽  
Melting Points ◽  
High Entropy ◽  
Fcc Metals ◽  
Cauchy Pressure ◽  
Fcc Structure

ABSTRACTMono-crystalline elastic constants of equiatomic quinary Cr-Mn-Fe-Co-Ni high entropy alloy with the fcc structure have experimentally been determined by a resonance ultrasound spectroscopy at room temperature. The values of the bulk modulus of the high entropy alloy experimentally determined are similar to other conventional fcc metals when the values are normalized by the melting points. This indicates that the entropy change at melting is similar to that of conventional metals. The values of Pough’s index and the Cauchy pressure are determined as 1.79 and -11.6 GPa, respectively. When the ductility of the alloy is judged from the indices, the ductility of the high entropy alloy is limited. In order to explain the negative Cauchy pressure of the high entropy alloy, it is required to assume that relatively strong directional interatomic bondings like intermetallic compounds exist in the alloy though the crystal is disordered solid solution.

scholarly journals Designing Rules of Laser-Clad High-Entropy Alloy Coatings with Simple Solid Solution Phases

2020 ◽  
Vol 33 (8) ◽  
pp. 1064-1076 ◽  
Author(s):  
Yongfei Juan ◽  
Jiao Zhang ◽  
Yongbing Dai ◽  
Qing Dong ◽  
Yanfeng Han
Keyword(s):  
Solid Solution ◽  
High Entropy Alloy ◽  
High Entropy

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.

Preparation of a Light-Weight MgCaAlLiCu High-Entropy Alloy

2017 ◽  
Vol 727 ◽  
pp. 132-135 ◽  
Author(s):  
Xing Hao Du ◽  
Rui Wang ◽  
Cai Chen ◽  
Bao Lin Wu ◽  
J.C. Huang
Keyword(s):  
Solid Solution ◽  
Tetragonal Symmetry ◽  
High Entropy Alloy ◽  
Solid Solution Phase ◽  
Light Weight ◽  
High Fracture ◽  
Compression Process ◽  
High Entropy ◽  
Symmetry Structure ◽  
Alloy Cast

In this paper, a light-weight equimolar MgCaAlLiCu high entropy alloy (HEA) is reported. The microstructure of the alloy cast in copper mould was composed mainly of a solid solution phase with tetragonal symmetry structure, presenting the high-entropy alloy nature. The alloy exhibited high fracture strength of 910 MPa during the room-temperature compression process. Based on thermodynamic calculation, the underlying reason for the formation of the solid solution in the MgCaAlLiCu alloy is given.

Cooling Rate and Size Effect on the Microstructure and Mechanical Properties of AlCoCrFeNi High Entropy Alloy

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
F. J. Wang ◽  
Y. Zhang ◽  
G. L. Chen ◽  
H. A. Davies
Keyword(s):  
Solid Solution ◽  
Atomic Ratio ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Body Centered Cubic ◽  
Mechanical Behaviors ◽  
High Entropy ◽  
Intermediate Phases ◽  
Different Diameters ◽  
Very High

High entropy alloys are usually defined as the kind of alloys with at least five principle components, each component has the equi-atomic ratio or near equi-atomic ratio, and the high entropy alloys can have very high entropy of mixing, forming simple solid solution rather than many complex intermediate phases. In this paper, the size effects on the microstructure and mechanical behaviors of a high entropy alloy of AlCoCrFeNi was studied by preparing as-cast rod samples with different diameters. The alloy independent of cast diameter samples has the same phase of body centered cubic solid solution. With decreasing casting diameter, both the strength and the plasticity are increased slightly.

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