Laser Cladding of Al0.5CoCrCuFeNiSi High Entropy Alloy Coating without and with Yttria Addition on H13 Steel

Al0.5CoCrCuFeNiSi high entropy alloy coating without and with a 1 wt.% Y2O3 addition was fabricated by laser cladding technique on H13 substrate. The results showed that the laser cladding coatings without and with Y2O3 addition consist of a mixture of body centered cubic (BCC) dendrites and face centered cubic (FCC) interdendrites. With the addition of Y2O3, the peaks of BCC dendrites in the coating shifted to leftwards, which is caused by the distortion of lattice due to the dissolution of Y with larger atomic radius. There exist cracks and porosities in the coating without Y2O3 addition. With Y2O3 addition, the cracks and porosities in the laser cladding coating were inhibited greatly. In addition, the microstructure of the coating with Y2O3 addition was refined due to the improving of the ratio of nucleation. The enhancement of properties, such as hardness, wear resistance and corrosion resistance, of the coating with Y2O3 addition came from the inhibition of cracks and porosities and the refinement of microstructure.

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Effect of temperature on small-scale deformation of individual face-centered-cubic and body-centered-cubic phases of an Al0.7CoCrFeNi high-entropy alloy

Materials & Design ◽

10.1016/j.matdes.2020.108611 ◽

2020 ◽

Vol 191 ◽

pp. 108611 ◽

Cited By ~ 1

Author(s):

Adenike M. Giwa ◽

Zachary H. Aitken ◽

Peter K. Liaw ◽

Yong-Wei Zhang ◽

Julia R. Greer

Keyword(s):

Effect Of Temperature ◽

Small Scale ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

Body Centered Cubic ◽

High Entropy ◽

Cubic Phases ◽

Face Centered

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Effects of Annealing on the Microstructure and Wear Resistance of Laser Cladding CrFeMoNbTiW High-Entropy Alloy Coating

Crystals ◽

10.3390/cryst11091096 ◽

2021 ◽

Vol 11 (9) ◽

pp. 1096

Author(s):

Qiang Shen ◽

Yan Li ◽

Jing Zhao ◽

Dezheng Liu ◽

Yongsheng Yang

Keyword(s):

Wear Resistance ◽

Laser Cladding ◽

Annealing Temperature ◽

Annealing Treatment ◽

Alloy Coating ◽

Resistance Testing ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

High Entropy ◽

Hardness Tester

In this study, a CrFeMoNbTiW high-entropy alloy (HEA) coating was prepared on a Q245R steel (American grade: SA515 Gr60) substrate by means of laser cladding. The effects of annealing temperature on the microstructure and wear resistance of the CrFeMoNbTiW coating were investigated using X-ray diffraction (XRD), a scanning electron microscope (SEM), a Vickers hardness tester and a roller friction wear tester. The results showed that the coating was mainly composed of body-centered cubic (BCC) solid solution and face-centered cubic (FCC) structural (Nb,Ti)C carbides prior to annealing, exhibiting an interdendritic structure and needlelike dendritic crystal structure with average microhardness of 682 HV0.2. The coarsening of the dendrite arms increased gradually after a 10-h long annealing treatment at 800 °C, 900 °C and 1000 °C, and a small amount of Laves phase was produced. After annealing, the highest microhardness value of the as-annealed coating reached 1176 HV0.2, which represents an increase of approximately 72.5% compared to that of the as-deposit coating. The wear resistance testing results imply that this type of coating retains good wear resistance following the annealing treatment and that its wear resistance increases in proportion to the annealing temperature in a range from 800 °C to 1000 °C.

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Effects of Boron Content on Microstructure and Wear Properties of FeCoCrNiBx High-Entropy Alloy Coating by Laser Cladding

Applied Sciences ◽

10.3390/app10010049 ◽

2019 ◽

Vol 10 (1) ◽

pp. 49 ◽

Cited By ~ 1

Author(s):

Dezheng Liu ◽

Jing Zhao ◽

Yan Li ◽

Wenli Zhu ◽

Liangxu Lin

Keyword(s):

Wear Resistance ◽

Laser Cladding ◽

Alloy Coating ◽

Rolling Friction ◽

Substrate Material ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

Micro Hardness ◽

Wear Properties ◽

High Entropy

The FeCoCrNiBx high-entropy alloy (HEA) coatings with three different boron (B) contents were synthesized on Q245R steel (American grade: SA515 Gr60) by laser cladding deposition technology. Effects of B content on the microstructure and wear properties of FeCoCrNiBx HEA coating were investigated. In this study, the phase composition, microstructure, micro-hardness, and wear resistance (rolling friction) were investigated by X-ray diffraction (XRD), a scanning electron microscope (SEM), a micro hardness tester, and a roller friction wear tester, respectively. The FeCoCrNiBx coatings exhibited a typical dendritic and interdendritic structure, and the microstructure was refined with the increase of B content. Additionally, the coatings were found to be a simple face-centered cubic (FCC) solid solution with borides. In terms of mechanical properties, the hardness and wear resistance ability of the coating can be enhanced with the increase of the B content, and the maximum hardness value of three HEA coatings reached around 1025 HV0.2, which is higher than the hardness of the substrate material. It is suggested that the present fabricated HEA coatings possess potentials in application of wear resistance structures for Q245R steel.

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Laser cladding of FeCoCrNi high-entropy alloy on Ti-6Al-4V alloy: Microstructure, phase transformation and bonding region

Modern Physics Letters B ◽

10.1142/s0217984921500378 ◽

2020 ◽

pp. 2150037

Author(s):

Xiaohong Zhan ◽

Chaoqi Qi ◽

Mengyao Wu ◽

Lijun Liu ◽

Zhuanni Gao

Keyword(s):

Laser Cladding ◽

Element Distribution ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

Rich Phase ◽

High Entropy ◽

Comprehensive Properties ◽

Input Material ◽

Face Centered ◽

Fcc Phase

High-entropy alloys (HEAs) have shown considerable promise from both a scientific and an application perspective due to their outstanding comprehensive properties. In this study, an equiatomic FeCoCrNi HEA is used as input material for laser cladding on Ti-6Al-4V alloy. The HEA coating is characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) to investigate the bonding region, element distribution and microstructure evolution. The results show that the HEA coating is mainly composed of face-centered cubic (FCC) phase and body-centered cubic (BCC) phase, precipitating a small amount of (Fe, Cr)-rich phase and (Ni, Ti)-rich phase. Otherwise, the bonding region, which is between coating and substrate, is emphatically concerned in this paper. The bonding region is formed by the convection zone which is resulted from the density difference of HEA and TC4. In addition, the convection in molten pool plays a key role in the morphology of bonding region.

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Effect of Titanium Content on Microstructure and Properties of FeWCrMnCoCuTix High Entropy Alloy Coating Prepared by Laser Cladding

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.563.25 ◽

2014 ◽

Vol 563 ◽

pp. 25-29

Author(s):

Xu Long An ◽

Qi Bin Liu ◽

Bo Zheng

Keyword(s):

Laser Cladding ◽

Alloy Coating ◽

Titanium Content ◽

Experimental Result ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

High Entropy ◽

Microstructure And Properties ◽

Simple Body ◽

Ti Content

To obtain the coating with excellent properties, FeWCrMnCoCuTix(x=0.2, 0.4, 0.6) high entropy alloys coating on 45 steel were prepared by laser cladding. By means of OM, XRD and microhardness tester, the effect of Ti content on microstructure and properties of coating is investigated. The experimental result shows that the phase composition of HEAs coating is simple body-centered cubic and face-centered cubic. The microstructure of these alloys is mainly dendrite crystal with grains were fine and uniform. When Ti content increases tox=0.4, the hardness of the coating reaches a maximum (639HV0.2). Key words: HEAs; FeWCrMnCoCuTix; coating; laser cladding; microstructure and properties

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Vacuum brazing of Al2O3 and 3D printed Ti6Al4V lap-joints using high entropy driven AlZnCuFeSi filler

Scientific Reports ◽

10.1038/s41598-021-87705-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Ashutosh Sharma ◽

Byungmin Ahn

Keyword(s):

Strength Properties ◽

Lap Joints ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

High Entropy ◽

Plasma Sintering ◽

Spark Plasma ◽

3D Printed ◽

Face Centered ◽

Alloy Filler

AbstractIn this work, we studied the brazing characteristics of Al2O3 and 3D printed Ti–6Al–4V alloys using a novel equiatomic AlZnCuFeSi high entropy alloy filler (HEAF). The HEAF was prepared by mechanical alloying of the constituent powder and spark plasma sintering (SPS) approach. The filler microstructure, wettability and melting point were investigated. The mechanical and joint strength properties were also evaluated. The results showed that the developed AlZnCuFeSi HEAF consists of a dual phase (Cu–Zn, face-centered cubic (FCC)) and Al–Fe–Si rich (base centered cubic, BCC) phases. The phase structure of the (Cu–Al + Ti–Fe–Si)/solid solution promises a robust joint between Al2O3 and Ti–6Al–4V. In addition, the joint interfacial reaction was found to be modulated by the brazing temperature and time because of the altered activity of Ti and Zn. The optimum shear strength reached 84 MPa when the joint was brazed at 1050 °C for 60 s. The results can be promising for the integration of completely different materials using the entropy driven fillers developed in this study.

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Microstructure Refinement by Low-Temperature Ausforming in an Fe-Based Metastable High-Entropy Alloy

Metals ◽

10.3390/met11050742 ◽

2021 ◽

Vol 11 (5) ◽

pp. 742

Author(s):

Motomichi Koyama ◽

Takeaki Gondo ◽

Kaneaki Tsuzaki

Keyword(s):

Low Temperature ◽

Plastic Anisotropy ◽

High Entropy Alloy ◽

Face Centered Cubic ◽

High Entropy ◽

Microstructure Refinement ◽

Hexagonal Close Packed ◽

Solution Treated Condition ◽

Solution Treated ◽

Face Centered

The effects of ausforming in an Fe30Mn10Cr10Co high-entropy alloy on the microstructure, hardness, and plastic anisotropy were investigated. The alloy showed a dual-phase microstructure consisting of face-centered cubic (FCC) austenite and hexagonal close-packed (HCP) martensite in the as-solution-treated condition, and the finish temperature for the reverse transformation was below 200 °C. Therefore, low-temperature ausforming at 200 °C was achieved, which resulted in microstructure refinement and significantly increased the hardness. Furthermore, plasticity anisotropy, a common problem in HCP structures, was suppressed by the ausforming treatment. This, in turn, reduced the scatter of the hardness.

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