scholarly journals Solid solution hardening in CrMnFeCoNi-based high entropy alloy systems studied by a combinatorial approach

2021 ◽  
Author(s):  
Tom Keil ◽  
Daniel Utt ◽  
Enrico Bruder ◽  
Alexander Stukowski ◽  
Karsten Albe ◽  
...  
Keyword(s):  
Solid Solution ◽  
Yield Strength ◽  
Strain Hardening ◽  
Solid Solution Hardening ◽  
High Entropy Alloy ◽  
Solution Hardening ◽  
Local Composition ◽  
High Entropy ◽  
Dependent Strain ◽  
Local Shear

Abstract Solid solution hardening in high entropy alloys was studied for the Cantor alloy using diffusion couples and nanoindentation. We study a continuous variation of the alloying content and directly correlate the nanoindentation hardness to the local composition up to the phase boundary. The composition dependent hardness is analysed using the Labusch model and the more recent Varvenne model. The Labusch model has been fitted to experimental data and confirms Cr as the most potent strengthening element. For comparison of the experimental hardness and the predicted yield strength of the Varvenne model, a concentration-dependent strain-hardening factor is introduced to account for strain hardening during indentation, which leads to a very good agreement between experiment and model. A study of the input parameters of the Varvenne model, performed by atomistic computer simulations, shows no significant effect of fluctuations in the atomic size misfit volumes or in the local shear modulus to the computed yield strength. Graphic Abstract

Martensitic Transformation of High-Entropy and Medium-Entropy Shape Memory Alloys

2021 ◽  
Vol 1016 ◽  
pp. 1802-1810
Author(s):  
Hiromichi Matsuda ◽  
Masayuki Shimojo ◽  
Hideyuki Murakami ◽  
Yoko Yamabe-Mitarai
Keyword(s):  
Solid Solution ◽  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
High Entropy ◽  
The One

As new generation of high-temperature shape memory alloys, high-entropy alloys (HEAs) have been attracted for strong solid-solution hardened alloys due to their severe lattice distortion and sluggish diffusion. TiPd is the one potential high-temperature shape memory alloys because of its high martensitic transformation temperature above 500 °C. As constituent elements, Zr expected solid-solution hardening, Pt expected increase of transformation temperature, Au expected keeping transformation temperature, and Co expected not to form harmful phase. By changing the alloy composition slightly, two HEAs and two medium entropy alloys (MEAs) were prepared. Only two MEAs, Ti45Zr5Pd25Pt20Au5, and Ti45Zr5Pd25Pt20Co5 had the martensitic transformation. The perfect recovery was obtained in Ti45Zr5Pd25Pt20Co5 during the repeated thermal cyclic test, training, under 200 MPa. On the other hand, the small irrecoverable strain was remained in Ti45Zr5Pd25Pt20Au5 during the training under 150 MPa because of the small solid-solution hardening effect. It indicates that Ti45Zr5Pd25Pt20Co5 is the one possible HT-SMA working between 342 and 450 °C.

Modelling solid solution hardening in high entropy alloys

2015 ◽  
Vol 85 ◽  
pp. 14-23 ◽  
Author(s):  
Isaac Toda-Caraballo ◽  
Pedro E.J. Rivera-Díaz-del-Castillo
Keyword(s):  
Solid Solution ◽  
Solid Solution Hardening ◽  
High Entropy Alloys ◽  
Solution Hardening ◽  
High Entropy

Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy

2021 ◽  
Author(s):  
Zibing An ◽  
Shengcheng Mao ◽  
Tao Yang ◽  
Chain Tsuan Liu ◽  
Bin Zhang ◽  
...  
Keyword(s):  
Solid Solution ◽  
Yield Strength ◽  
Lattice Strain ◽  
Tensile Elongation ◽  
High Yield ◽  
High Entropy Alloy ◽  
High Yield Strength ◽  
High Entropy ◽  
Elongation To Failure

A combination of high yield strength (1.1 GPa) and large tensile elongation to failure (28%) is achieved in a HfNbTiV refractory high-entropy alloy by creating modulated nanoscale inhomogeneity in both composition and lattice strain.

Solid-solution hardening of a high-Entropy AlTiVCrNbMo alloy

2014 ◽  
Vol 2014 (4) ◽  
pp. 285-292 ◽  
Author(s):  
S. A. Firstov ◽  
T. G. Rogul’ ◽  
N. A. Krapivka ◽  
S. S. Ponomarev ◽  
V. N. Tkach ◽  
...  
Keyword(s):  
Solid Solution ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
High Entropy

Structural Features and Solid-Solution Hardening of High-Entropy CrMnFeCoNi Alloy

2016 ◽  
Vol 55 (3-4) ◽  
pp. 225-235 ◽  
Author(s):  
S. A. Firstov ◽  
T. G. Rogul’ ◽  
N. A. Krapivka ◽  
S. S. Ponomarev ◽  
V. V. Kovylyaev ◽  
...  
Keyword(s):  
Solid Solution ◽  
Structural Features ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
High Entropy

The Effect of Tungsten on the Mechanical Properties of Tantalum

1999 ◽  
Vol 121 (2) ◽  
pp. 172-177 ◽  
Author(s):  
C. L. Briant ◽  
D. H. Lassila
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Yield Strength ◽  
Mechanical Behavior ◽  
Work Hardening ◽  
Solid Solution Hardening ◽  
Solution Hardening

This paper reports a study of the mechanical behavior of Ta-W alloys. The results show that tungsten additions increase the yield strength and the rate of work hardening of tantalum. These additions also cause a change in the deformed microstructure from one that is primarily cellular to one that consists mostly of dislocation tangles. It is proposed that the increase in yield strength arises from solid solution hardening and that the increase in the work hardening can be correlated with an increase in the density and arrangement of dislocations present in the material.

Computational design of light and strong high entropy alloys (HEA): Obtainment of an extremely high specific solid solution hardening

2018 ◽  
Vol 156 ◽  
pp. 120-123 ◽  
Author(s):  
Edern Menou ◽  
Franck Tancret ◽  
Isaac Toda-Caraballo ◽  
Gérard Ramstein ◽  
Philippe Castany ◽  
...  
Keyword(s):  
Solid Solution ◽  
Computational Design ◽  
Solid Solution Hardening ◽  
High Entropy Alloys ◽  
Solution Hardening ◽  
High Entropy
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