Tensile yield strength of a single bulk Al0.3CoCrFeNi high entropy alloy can be tuned from 160 MPa to 1800 MPa

2019 ◽  
Vol 162 ◽  
pp. 18-23 ◽  
Author(s):  
Bharat Gwalani ◽  
Stephane Gorsse ◽  
Deep Choudhuri ◽  
Yufeng Zheng ◽  
Rajiv S. Mishra ◽  
...  
Keyword(s):  
Yield Strength ◽  
Tensile Yield Strength ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Enhanced tensile yield strength in laser additively manufactured Al0.3CoCrFeNi high entropy alloy

Materialia ◽  
2020 ◽  
Vol 9 ◽  
pp. 100522 ◽  
Author(s):  
Mohan Sai Kiran Kumar Yadav Nartu ◽  
Talukder Alam ◽  
Sriswaroop Dasari ◽  
Srinivas Aditya Mantri ◽  
Stephane Gorsse ◽  
...  
Keyword(s):  
Yield Strength ◽  
Tensile Yield Strength ◽  
High Entropy Alloy ◽  
High Entropy

A novel Fe-Co-Ni-Si high entropy alloy with high yield strength, saturated magnetization and Curie temperature

2020 ◽  
Vol 281 ◽  
pp. 128653
Author(s):  
Chen Chen ◽  
Yanzhou Fan ◽  
Hang Zhang ◽  
Jialiang Hou ◽  
Weiwei Zhang ◽  
...  
Keyword(s):  
Yield Strength ◽  
Curie Temperature ◽  
High Yield ◽  
High Entropy Alloy ◽  
High Yield Strength ◽  
High Entropy

Microstructure and Mechanical Properties of Equitomic CoCrFeCuNi High Entropy Alloy

2018 ◽  
Vol 765 ◽  
pp. 149-154 ◽  
Author(s):  
Seung Min Oh ◽  
Sun Ig Hong
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Cold Rolling ◽  
Cast Alloy ◽  
Cold Work ◽  
High Entropy Alloy ◽  
Second Phase ◽  
Rich Phase ◽  
High Entropy ◽  
Microstructure And Mechanical Properties

Microstructure and mechanical properties of cast and cold-rolled equitomic CoCrFeCuNi alloy in which Mn was substituted by Cu from Cantor alloy was studied. The separation into two solid solutions (Cr-Co-Fe rich and Cu-rich phases) were observed in CoCrFeCuNi. Coarsening and widening of interdendritic Cu-rich phase after homogenization was observed after homogenization, suggesting Cu-rich phase is thermodynamically stable. The compressive stress-strain curves of homogenized cast CoCrFeCuNi alloy exhibited the reasonably high strength and excellent deformability for the cast alloy. The yield strength increased up to 960MPa after cold rolling from 265MPa of the homogenized cast alloy. The significant increase of yield strength is thought to be associated with the alignment of Cu-rich second phase in addition to cold work dislocation storage after cold rolling.

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

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.

scholarly journals In Situ Development and High Temperature Features of CoCrFeNi-M6Cp High Entropy-Alloy Based Hardmetal

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 408
Author(s):  
Huizhong Li ◽  
He Lin ◽  
Xiaopeng Liang ◽  
Weiwei He ◽  
Bin Liu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Volume Fraction ◽  
High Entropy Alloy ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Average Grain Size ◽  
Carbide Particles

In this work, an in-situ CoCrFeNi-M6Cp high entropy-alloy (HEA) based hardmetal with a composition of Co25Cr21Fe18Ni23Mo7Nb3WC2 was fabricated by the powder metallurgy (PM) method. Microstructures and mechanical properties of this HEA were characterized and analyzed. The results exhibit that this HEA possesses a two-phase microstructure consisting of the face-centered cubic (FCC) matrix phase and the carbide M6C phase. This HEA has an average grain size of 2.2 μm, and the mean size and volume fraction of carbide particles are 1.2 μm and 20%. The tensile tests show that the alloy has a yield strength of 573 MPa, ultimate tensile strength of 895 MPa and elongation of 5.5% at room temperature. The contributions from different strengthening mechanisms in this HEA were calculated. The grain boundary strengthening is the dominant strengthening mechanism, and the carbide particles are significant for the further enhancement of yield strength by the dislocation strengthening and Orowan strengthening. In addition, with increasing temperatures from 600 °C to 900 °C, the HEA shows a reduced yield strength (YS) from 473 MPa to 142 MPa, a decreased ultimate tensile strength (UTS) from 741 MPa to 165 MPa and an enhanced elongation from 10.5% to 31%.

scholarly journals Snoek-type damping performance in strong and ductile high-entropy alloys

2020 ◽  
Vol 6 (25) ◽  
pp. eaba7802 ◽  
Author(s):  
Zhifeng Lei ◽  
Yuan Wu ◽  
Junyang He ◽  
Xiongjun Liu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Atomic Oxygen ◽  
Tensile Yield Strength ◽  
Damping Capacity ◽  
High Entropy Alloy ◽  
Mechanical Vibrations ◽  
High Entropy ◽  
Public Health Hazards ◽  
Damping Materials ◽  
Damping Peak ◽  
Snoek Relaxation

Noise and mechanical vibrations not only cause damage to devices, but also present major public health hazards. High-damping alloys that eliminate noise and mechanical vibrations are therefore required. Yet, low operating temperatures and insufficient strength/ductility ratios in currently available high-damping alloys limit their applicability. Using the concept of high-entropy alloy (HEA), we present a class of high-damping materials. The design is based on refractory HEAs, solid-solutions doped with either 2.0 atomic % oxygen or nitrogen, (Ta0.5Nb0.5HfZrTi)98O2 and (Ta0.5Nb0.5HfZrTi)98N2. Via Snoek relaxation and ordered interstitial complexes mediated strain hardening, the damping capacity of these HEAs is as high as 0.030, and the damping peak reaches up to 800 K. The model HEAs also exhibit a high tensile yield strength of ~1400 MPa combined with a large ductility of ~20%. The high-temperature damping properties, together with superb mechanical properties make these HEAs attractive for applications where noise and vibrations must be reduced.

scholarly journals Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy

2020 ◽  
Author(s):  
Chanho Lee ◽  
Yi Chou ◽  
George Kim ◽  
Michael C. Gao ◽  
Ke An ◽  
...  
Keyword(s):  
Yield Strength ◽  
Lattice Distortion ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Enhanced Yield
Sign in / Sign up

Export Citation Format

Share Document