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

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.

Effect of Aging Treatment on Microstructure and Wear Properties of CoCrFeNiTiNbB1.25 High Entropy Alloys Coatings by Laser Cladding

2021 ◽  
Vol 13 (7) ◽  
pp. 1280-1288
Author(s):  
Lin Ding ◽  
Hongxin Wang ◽  
Xiumin Quan
Keyword(s):  
Abrasive Wear ◽  
Mass Loss ◽  
Laser Cladding ◽  
Volume Fraction ◽  
Aging Treatment ◽  
Treatment Temperature ◽  
High Entropy Alloys ◽  
Wear Properties ◽  
H13 Steel ◽  
High Entropy

ABSTRACTLaser cladding CoCrFeNiTiNbB1.25 high entropy alloys (HEAs) coatings on H13 steel was fabricated. The effect of aging treatment temperature on microstructure and wear resistance of the HEAS coatings was investigated. Results showed the phases of the HEAs coatings were not changed as the aging treatment increased, 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 HEAs coatings consisted of typical dendrite, interdendritic eutectic and dispersed intermetallic compound after aging treatment, and the dendrite obviously was coarsened after aging treatment at 850 °C. Compared with HEAs coatings before aging treatment, the microhardness of the HEAs coatings was firstly increased as the aging treatment temperature increased, 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 treatment at 750 °C. The wear mechanism of the HEAs coatings before aging treatment was the abrasive wear, and was the abrasive wear and adhesive wear after aging treatment.

TGO and Al diffusion behavior of CuAlxNiCrFe high-entropy alloys fabricated by high-speed laser cladding for TBC bond coats

2021 ◽  
pp. 109781
Author(s):  
Qing-Long Xu ◽  
Kang-Cheng Liu ◽  
Ke-Yan Wang ◽  
Li-Yan Lou ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Laser Cladding ◽  
High Speed ◽  
High Entropy Alloys ◽  
Diffusion Behavior ◽  
High Entropy ◽  
Bond Coats

Thermal stability and oxidation resistance of FeCrxCoNiB high-entropy alloys coatings by laser cladding

2019 ◽  
Vol 359 ◽  
pp. 132-140 ◽  
Author(s):  
Fa Chang ◽  
Bingjie Cai ◽  
Chong Zhang ◽  
Biao Huang ◽  
Shuai Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Oxidation Resistance ◽  
Laser Cladding ◽  
High Entropy Alloys ◽  
High Entropy

Effect of Mo and aging temperature on corrosion behavior of (CoCrFeNi)100-Mo high-entropy alloys

2020 ◽  
Vol 812 ◽  
pp. 152139 ◽  
Author(s):  
Wenrui Wang ◽  
Jieqian Wang ◽  
Zhihui Sun ◽  
Jiangtao Li ◽  
Laifeng Li ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Aging Temperature ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals Prediction of Strength and Ductility in Partially Recrystallized CoCrFeNiTi0.2 High-Entropy Alloy

Entropy ◽  
2019 ◽  
Vol 21 (4) ◽  
pp. 389 ◽  
Author(s):  
Hanwen Zhang ◽  
Peizhi Liu ◽  
Jinxiong Hou ◽  
Junwei Qiao ◽  
Yucheng Wu
Keyword(s):  
Tensile Strength ◽  
Single Phase ◽  
Volume Fraction ◽  
Tensile Elongation ◽  
High Entropy Alloy ◽  
High Entropy Alloys ◽  
Number Density ◽  
High Entropy ◽  
Average Size ◽  
Strength And Ductility

The mechanical behavior of a partially recrystallized fcc-CoCrFeNiTi0.2 high entropy alloys (HEA) is investigated. Temporal evolutions of the morphology, size, and volume fraction of the nanoscaled L12-(Ni,Co)3Ti precipitates at 800 °C with various aging time were quantitatively evaluated. The ultimate tensile strength can be greatly improved to ~1200 MPa, accompanied with a tensile elongation of ~20% after precipitation. The temporal exponents for the average size and number density of precipitates reasonably conform the predictions by the PV model. A composite model was proposed to describe the plastic strain of the current HEA. As a consequence, the tensile strength and tensile elongation are well predicted, which is in accord with the experimental results. The present experiment provides a theoretical reference for the strengthening of partially recrystallized single-phase HEAs in the future.

scholarly journals WxNbMoTa Refractory High-Entropy Alloys Fabricated by Laser Cladding Deposition

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 533 ◽  
Author(s):  
Qingyu Li ◽  
Hang Zhang ◽  
Dichen Li ◽  
Zihao Chen ◽  
Sheng Huang ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Compressive Strain ◽  
The Body ◽  
Vacuum Arc ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Refractory Alloys ◽  
Arc Melting ◽  
Bcc Structure ◽  
Tungsten Concentration

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.

scholarly journals Tribological Behavior of Boronized Fe40Mn20Cr20Ni20 High-Entropy Alloys

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1561
Author(s):  
Xin Guo ◽  
Xi Jin ◽  
Xiaohui Shi ◽  
Huijun Yang ◽  
Min Zhang ◽  
...  
Keyword(s):  
Wear Rate ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Tribological Behavior ◽  
Deionized Water ◽  
Cubic Phase ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Delamination Wear ◽  
Hot Rolled

The tribological behavior of hot-rolled and boronized Fe40Mn20Cr20Ni20 high-entropy alloys (HEAs) sliding against a Si3N4 ball was investigated in the air, deionized water and seawater. The results showed that the hot-rolled Fe40Mn20Cr20Ni20 HEA was composed of an FCC (face-centered cubic) phase. In addition, the boronized HEA was composed of a great number of borides, including CrB, FeB, MnB, Fe2B, Fe3B and MnB2. The hardness increased from 139 HV to 970 HV after boronizing. In air, the wear rate decreased from 4.51 × 10−4 mm3/Nm to 0.72 × 10−4 mm3/Nm after boronizing. The wear mechanism transformed from abrasive wear and oxidative wear to the polishing effect. After boronizing, in the deionized water, the wear rate decreased from 1.27 × 10−4 mm3/Nm to 8.43 × 10−5 mm3/Nm. The wear mechanism transformed from abrasive wear and delamination wear to delamination wear. In the seawater, the wear rate decreased by about ten times that of hot-rolled alloy.

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