Optimizing the coupled effects of Hall-Petch and precipitation strengthening in a Al 0.3 CoCrFeNi high entropy alloy

2017 ◽  
Vol 121 ◽  
pp. 254-260 ◽  
Author(s):  
B. Gwalani ◽  
Vishal Soni ◽  
Michael Lee ◽  
SA Mantri ◽  
Yang Ren ◽  
...  
Keyword(s):  
Precipitation Strengthening ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Microstructure and Mechanical Property Evolution during Annealing of a Cold-Rolled Metastable Powder Metallurgy High Entropy Alloy

Entropy ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 833 ◽  
Author(s):  
Li ◽  
Qiu ◽  
Guo ◽  
Liu ◽  
Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Powder Metallurgy ◽  
Cold Deformation ◽  
Precipitation Strengthening ◽  
High Entropy Alloy ◽  
Σ Phase ◽  
High Entropy ◽  
Fine Grain

Precipitation strengthening is an effective approach to strengthen high-entropy alloys (HEAs) with a simple face-center-cubic (FCC) structure. In this work, CoCrFeNiMo0.2 HEAs were prepared by powder metallurgy, followed by cool rolling and subsequent heat-treatment at different temperatures. The effects of cold working and annealing on microstructure and mechanical properties have been investigated. Results show the fine and dispersed (Cr, Mo)-rich σ phase with a topologically close-packed structure precipitated in the FCC matrix after the prior cold deformation process, which enhanced the mechanical property of the CoCrFeNiMo0.2 alloy. The HEA annealed at 600 °C for 48 h had a tensile strength of 1.9 GPa but an elongation which decreased to 8%. The HEA annealed at 800 °C for 12 h exhibited a tensile strength of 1.2 GPa and an elongation of 31%. These outstanding mechanical properties can be attributed to precipitation strengthening and fine-grain strengthening.

Carbide precipitation strengthening in fine-grained carbon-doped FeCoCrNiMn high entropy alloy

2019 ◽  
Vol 803 ◽  
pp. 491-498 ◽  
Author(s):  
Jian Peng ◽  
Ziyong Li ◽  
Liming Fu ◽  
Xinbo Ji ◽  
Zhuorui Pang ◽  
...  
Keyword(s):  
Carbide Precipitation ◽  
Precipitation Strengthening ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Carbon Doped ◽  
Fine Grained

Precipitation strengthening in a hot-worked TiNbTa0.5ZrAl0.5 refractory high entropy alloy

2019 ◽  
Vol 246 ◽  
pp. 186-189 ◽  
Author(s):  
Yuankui Cao ◽  
Yong Liu ◽  
Yunping Li ◽  
Bin Liu ◽  
Jiawen Wang ◽  
...  
Keyword(s):  
Precipitation Strengthening ◽  
High Entropy Alloy ◽  
High Entropy

Instant and Persistent Hydrogen Production Using Nano High Entropy Catalyst

2019 ◽  
Author(s):  
Nirmal Kumar ◽  
Subramanian Nellaiappan ◽  
Ritesh Kumar ◽  
Kirtiman Deo Malviya ◽  
K. G. Pradeep ◽  
...  
Keyword(s):  
Formic Acid ◽  
Minimum Energy ◽  
High Entropy Alloy ◽  
Hydrogen Energy ◽  
High Entropy ◽  
Electro Oxidation ◽  
The Individual ◽  
Novel Catalyst ◽  
Cell Anode ◽  
Fuel Cell Anode

<div>Renewable harvesting clean and hydrogen energy using the benefits of novel multicatalytic materials of high entropy alloy (HEA equimolar Cu-Ag-Au-Pt-Pd) from formic acid with minimum energy input has been achieved in the present investigation. The synthesis effect of pristine elements in the HEA drives the electro-oxidation reaction towards non-carbonaceous pathway . The atomistic simulation based on DFT rationalize the distinct lowering of the d-band center for the individual atoms in the HEA as compared to the pristine counterparts. This catalytic activity of the HEA has also been extended to methanol electro-oxidation to show the unique capability of the novel catalyst. The nanostructured HEA, properties using a combination of casting and cry omilling techniques can further be utilized as fuel cell anode in direct formic acid/methanol fuel cells (DFFE).<br></div>

Complex magnetism and magnetoresistance of Gd-Tb-Dy-Ho-Lu hexagonal high-entropy alloy

2018 ◽  
Author(s):  
Janez Dolinšek ◽  
Stanislav Vrtnik ◽  
J. Lužnik ◽  
P. Koželj ◽  
M. Feuerbacher
Keyword(s):  
High Entropy Alloy ◽  
High Entropy

Recent progress in multi-element alloy and nitride coatings sputtered from high-entropy alloy targets

2006 ◽  
Vol 31 (6) ◽  
pp. 723-736 ◽  
Author(s):  
Keng-Hao Cheng ◽  
Chia-Han Lai ◽  
Su-Jien Lin ◽  
Jien-Wei Yeh
Keyword(s):  
Recent Progress ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Nitride Coatings
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