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

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.

Download Full-text

Break the strength-ductility trade-off in a ransformation-induced plasticity high-entropy alloy reinforced with precipitation strengthening

Journal of Material Science and Technology ◽

10.1016/j.jmst.2021.08.061 ◽

2021 ◽

Author(s):

Dong Huang ◽

Yanxin Zhuang

Keyword(s):

Precipitation Strengthening ◽

High Entropy Alloy ◽

Trade Off ◽

High Entropy

Download Full-text

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

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2019.06.204 ◽

2019 ◽

Vol 803 ◽

pp. 491-498 ◽

Cited By ~ 13

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

Download Full-text

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

Materials Letters ◽

10.1016/j.matlet.2019.03.075 ◽

2019 ◽

Vol 246 ◽

pp. 186-189 ◽

Cited By ~ 5

Author(s):

Yuankui Cao ◽

Yong Liu ◽

Yunping Li ◽

Bin Liu ◽

Jiawen Wang ◽

...

Keyword(s):

Precipitation Strengthening ◽

High Entropy Alloy ◽

High Entropy

Download Full-text

High-strength and high-ductility AlCoCrFeNi2.1 eutectic high-entropy alloy achieved via precipitation strengthening in a heterogeneous structure

Scripta Materialia ◽

10.1016/j.scriptamat.2020.04.035 ◽

2020 ◽

Vol 186 ◽

pp. 336-340 ◽

Cited By ~ 3

Author(s):

Ting Xiong ◽

Shijian Zheng ◽

Jingyu Pang ◽

Xiuliang Ma

Keyword(s):

High Strength ◽

Precipitation Strengthening ◽

High Entropy Alloy ◽

Heterogeneous Structure ◽

High Ductility ◽

High Entropy

Download Full-text

Instant and Persistent Hydrogen Production Using Nano High Entropy Catalyst

10.26434/chemrxiv.9777257.v1 ◽

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>

Download Full-text