A review on laser cladding of high-entropy alloys, their recent trends and potential applications

WxNbMoTa refractory high-entropy alloys with four different tungsten concentrations (x = 0, 0.16, 0.33, 0.53) were fabricated by laser cladding deposition. The crystal structures of WxNbMoTa alloys are all a single-phase solid solution of the body-centered cubic (BCC) structure. The size of the grains and dendrites are 20 μm and 4 μm on average, due to the rapid solidification characteristics of the laser cladding deposition. These are much smaller sizes than refractory high-entropy alloys fabricated by vacuum arc melting. In terms of integrated mechanical properties, the increase of the tungsten concentration of WxNbMoTa has led to four results of the Vickers microhardness, i.e., Hv = 459.2 ± 9.7, 476.0 ± 12.9, 485.3 ± 8.7, and 497.6 ± 5.6. As a result, NbMoTa alloy shows a yield strength (σb) and compressive strain (εp) of 530 Mpa and 8.5% at 1000 °C, leading to better results than traditional refractory alloys such as T-111, C103, and Nb-1Zr, which are commonly used in the aerospace industry.

Download Full-text

Microstructure and Abrasion Resistance of Laser Cladding CoCrFeNiTiNbB1.25 High-Entropy Alloys Coatings Treated by Aging

Science of Advanced Materials ◽

10.1166/sam.2021.4010 ◽

2021 ◽

Vol 13 (8) ◽

pp. 1479-1487

Author(s):

Lin Ding ◽

Hongxin Wang ◽

Xiumin Quan

Keyword(s):

Abrasive Wear ◽

Mass Loss ◽

Laser Cladding ◽

Aging Temperature ◽

Abrasion Resistance ◽

Volume Fraction ◽

High Entropy Alloys ◽

H13 Steel ◽

High Entropy ◽

The Right

Laser cladding CoCrFeNiTiNbB1.25 high-entropy alloys coatings on H13 steel was fabricated. The microstructure and abrasion resistance of aged high-entropy alloys coatings at different temperature were researched. Results showed the phase was not changed in the high-entropy alloys coatings as the aging temperature elevated, the volume fraction of TiB phase was firstly increased, then reduced. The diffraction peak of fcc phase was firstly shifted to the right, and then shifted to the left. The aged high-entropy alloys coatings consisted of typical dendrite, interdendritic eutectic and dispersed intermetallic compound, and the dendrite obviously was coarsened after aging at 850 °C. Compared with non-aged high-entropy alloys coatings, the microhardness of aged high-entropy alloys coatings was firstly elevated as the aging temperature elevated, then decreased, and the mass loss was opposite. The microhardness and mass loss was decreased by 4.3% and 11.9%, respectively, for the aging at 750 °C. The abrasion mechanism of non-aged high-entropy alloys coatings was the abrasive wear, and was the abrasive wear and adhesive wear after aging.

Download Full-text

Mechanical and Magnetic Properties of the High-Entropy Alloys for Combinatorial Approaches

Crystals ◽

10.3390/cryst10030200 ◽

2020 ◽

Vol 10 (3) ◽

pp. 200 ◽

Cited By ~ 4

Author(s):

E-Wen Huang ◽

Guo-Yu Hung ◽

Soo Yeol Lee ◽

Jayant Jain ◽

Kuan-Pang Chang ◽

...

Keyword(s):

Magnetic Properties ◽

Thermal Spray Coatings ◽

High Entropy Alloy ◽

High Entropy Alloys ◽

High Entropy ◽

Spray Coatings ◽

Wear And Corrosion ◽

Potential Applications ◽

Magnetic Applications ◽

Alloy Properties

This review summarizes the state of high-entropy alloys and their combinatorial approaches, mainly considering their magnetic applications. Several earlier studies on high-entropy alloy properties, such as magnetic, wear, and corrosion behavior; different forms, such as thin films, nanowires, thermal spray coatings; specific treatments, such as plasma spraying and inclusion effects; and unique applications, such as welding, are summarized. High-entropy alloy systems that were reported for both their mechanical and magnetic properties are compared through the combination of their Young’s modulus, yield strength, remanent induction, and coercive force. Several potential applications requiring both mechanical and magnetic properties are reported.

Download Full-text