AlCoCuFeNi High-Entropy Alloy Coating Fabricated by Laser Cladding with Gas-Atomized Pre-Alloy Powders

2020 ◽  
Vol 993 ◽  
pp. 1148-1154 ◽  
Author(s):  
Mi Na Zhang ◽  
Wen Tai Ouyang ◽  
Jun Ke Jiao ◽  
Wen Wu Zhang ◽  
Xiang Lin Zhou
Keyword(s):  
Temperature Gradient ◽  
Laser Cladding ◽  
Steel Substrate ◽  
Alloy Coating ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Metallurgical Bonding ◽  
High Microhardness ◽  
Fcc Phase ◽  
Equiaxed Grain

AlCoCuFeNi high-entropy alloy coating was prepared by laser cladding with gas-atomized pre-alloy powders. The phase, microstructure and microhardness of HEA coating have been investigated. The results show that the AlCoCuFeNi coating was about ~ 800 μm in thickness, and the hard coating with strong metallurgical bonding to the substrate was obtained. The HEA coating is mainly composed of BCC dendrites phase and Cu-rich FCC phase within the interdendrite. The transition in structure from columnar to equiaxed grain can be observed in the coating due to the effect of different temperature gradient. The laser clad AlCoCuFeNi coating exhibited high microhardness of about 427.7 HV0.2, which was 2.5 times that of the 45# steel substrate.

Effect of Mn Contents on the Phase Transition of the High Entropy Alloy Prepared by Laser Cladding

2016 ◽  
Vol 849 ◽  
pp. 64-70 ◽  
Author(s):  
Shi Da Liu ◽  
Cun Yuan Peng ◽  
Ming Xing Ma ◽  
Wen Jin Liu ◽  
Wei Ming Zhang
Keyword(s):  
Phase Transition ◽  
Laser Cladding ◽  
Phase Structure ◽  
Steel Substrate ◽  
High Hardness ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Two Phases ◽  
Fcc Phase ◽  
Bcc Phase

Al1.3FeCoNiCuCr high entropy alloy (HEA) coatings were prepared by pre-placed laser cladding on 921A steel substrate, and the study on the phase transition of the Al1.3FeCoNiCuCr coating due to the introduction of Mn was conducted. The combination of TEM and XRD results showed that the Al1.3FeCoNiCuCr HEA coatings without Mn addition typically consisted of two kinds of grains, i.e., one is composed of only FCC phase, and the another is a mixture of BCC and FCC phases. The two phases were of similar ratio in the coatings, while nanoparticulate precipitates were observed in the bcc phase. When 3 wt. % Mn was introduced into the alloy, the coatings consisted of also FCC and BCC phase. However, most of the grains were in FCC phase, while the BCC phase with a lath shape only distributed between the FCC phases. High hardness nanobanded precipitates were observed in the FCC phase. It is clearly revealed that the phase structure of Al1.3FeCoNiCuCr coatings undergoes a dramatic transition due to the introducing of Mn.

scholarly journals Phase Evolution, Microstructure and Mechanical Property of AlCoCrFeNiTi High-Entropy Alloy Coatings Prepared by Mechanical Alloying and Laser Cladding

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1036
Author(s):  
Weijie Yu ◽  
Yun Wang ◽  
Ruitao Li ◽  
Junhong Mao
Keyword(s):  
Mechanical Alloying ◽  
Laser Cladding ◽  
Steel Substrate ◽  
Phase Evolution ◽  
High Entropy Alloy ◽  
Second Phase ◽  
Face Centered Cubic ◽  
High Entropy ◽  
Fcc Phase ◽  
Bcc Phase

AlCoCrFeNiTi high-entropy alloy coatings (HEACs) were prepared by mechanical alloying (MA) and laser cladding (LC) process on H13 hot-working die steel substrate. Phase evolution, microstructure, and mechanical properties of the alloyed powder and HEACs were investigated in detail. The final milling AlCoCrFeNiTi coating powders exhibited simple body centered cubic (BCC) phase and mean granular size of less than 4 μm. With the increase of heat input of the laser, partial BCC phase transformed into minor face centered cubic (FCC) phase during LC. AlCoCrFeNiTi HEACs showed excellent metallurgical bonding with the substrate, and few defects. Moreover, the microhardness of AlCoCrFeNiTi HEACs reached 1069 HV due to the existence of the hard oxidation and the second phase grains, which are about five times that of the substrate. The laser surface cladding HEACs exhibited deteriorated tensile property compared with that of the substrate and the fracture generally occurred in the region of HEACs. The fracture mechanism of AlCoCrFeNiTi HEACs was dominated by the comprehensive influence of brittle fracture and ductile fracture.

Study on Laser Cladding FeAlCrNiSiC High Entropy Alloy Coating

Applied laser ◽  
2015 ◽  
Vol 35 (1) ◽  
pp. 7-13 ◽  
Author(s):  
陈岁元 Chen Suiyuan ◽  
徐世海 Xu Shihai ◽  
王力 Wang Li ◽  
尹桂莉 Yin Guili ◽  
梁京 Liang Jing ◽  
...  
Keyword(s):  
Laser Cladding ◽  
Alloy Coating ◽  
High Entropy Alloy ◽  
High Entropy

Formation of core–shell structure in high entropy alloy coating by laser cladding

2016 ◽  
Vol 363 ◽  
pp. 543-547 ◽  
Author(s):  
Hui Zhang ◽  
Wanfei Wu ◽  
Yizhu He ◽  
Mingxi Li ◽  
Sheng Guo
Keyword(s):  
Laser Cladding ◽  
Shell Structure ◽  
Alloy Coating ◽  
High Entropy Alloy ◽  
Core Shell ◽  
High Entropy ◽  
Core Shell Structure

scholarly journals Fabrication of AlCoCrFeNi High-Entropy Alloy Coating on an AISI 304 Substrate via a CoFe2Ni Intermediate Layer

Entropy ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 2 ◽  
Author(s):  
Wenyuan Cui ◽  
Sreekar Karnati ◽  
Xinchang Zhang ◽  
Elizabeth Burns ◽  
Frank Liou
Keyword(s):  
Intermediate Layer ◽  
Steel Substrate ◽  
Alloy Coating ◽  
304 Stainless Steel ◽  
High Entropy Alloy ◽  
Intermediate Step ◽  
Dendritic Microstructure ◽  
Aisi 304 ◽  
High Entropy ◽  
Average Hardness

Through laser metal deposition, attempts were made to coat AlCoCrFeNi, a high-entropy alloy (HEA), on an AISI 304 stainless steel substrate to integrate their properties. However, the direct coating of the AlCoCrFeNi HEA on the AISI 304 substrate was found to be unviable due to cracks at the interface between these two materials. The difference in compositional change was suspected to be the source of the cracks. Therefore, a new transition route was performed by coating an intermediate layer of CoFe2Ni on the AISI 304 substrate. Investigations into the microstructure, phase composition, elemental composition and Vickers hardness were carried out in this study. Consistent metallurgical bonding was observed along both of the interfaces. It was found that the AlCoCrFeNi alloy solidified into a dendritic microstructure. The X-ray diffraction pattern revealed a transition of the crystal structure of the AISI 304 substrate to the AlCoCrFeNi HEA. An intermediate step in hardness was observed between the AISI 304 substrate and the AlCoCrFeNi HEA. The AlCoCrFeNi alloy fabricated was found to have an average hardness of 418 HV, while the CoFe2Ni intermediate layer had an average hardness of 275 HV.

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