scholarly journals Corrosion and slurry erosion wear performances of coaxial direct laser deposited CoCrFeNiCu1-xMox high-entropy coatings by modulating the second-phase precipitation

2021 ◽  
pp. 110277
Author(s):  
Jiakun Wang ◽  
Yushan Chen ◽  
Yunhua Zhang ◽  
Wenying Dai ◽  
Qian Xu ◽  
...  
Keyword(s):  
Second Phase ◽  
Erosion Wear ◽  
Phase Precipitation ◽  
Slurry Erosion ◽  
High Entropy ◽  
Direct Laser

Microstructure and Properties of Alloys with Equal Atomic Principal Components

2013 ◽  
Vol 765-767 ◽  
pp. 3143-3146
Author(s):  
Yan Ping Wang ◽  
Yu Zhuang ◽  
Jian Chen Li
Keyword(s):  
Solid Solution ◽  
Principal Components ◽  
Argon Atmosphere ◽  
Second Phase ◽  
High Entropy Alloys ◽  
Arc Furnace ◽  
Phase Precipitation ◽  
High Entropy ◽  
Bcc Structure ◽  
Fcc Structure

Four high-entropy alloys are prepared by an arc furnace under argon atmosphere. The microstructure and the properties of the alloys are investigated. The results show that NiCrCuCoFe alloy consists of a single FCC solid solution. When Al presents in the alloys, the microstructures of the alloys change to a BCC+ FCC solid solution. It is indicated that Al element promotes the formation of BCC solid solution, and Si and Mn promote the formation of complicated compounds. The hardness of alloys with BCC structure is higher than that of the alloys with FCC structure. The complicated compounds are formed, the hardness increases further. The highest hardness of the alloys reaches 882 HV due to the strengthening of the second phase precipitation.

Edge and particle embedment effects in low- and high-stress slurry erosion wear of steels and elastomers

Wear ◽  
2017 ◽  
Vol 388-389 ◽  
pp. 126-135 ◽  
Author(s):  
N. Ojala ◽  
K. Valtonen ◽  
J. Minkkinen ◽  
V.-T. Kuokkala
Keyword(s):  
High Stress ◽  
Erosion Wear ◽  
Slurry Erosion

scholarly journals Coherent Precipitation and Strengthening in Compositionally Complex Alloys: A Review

Entropy ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 878 ◽  
Author(s):  
Qing Wang ◽  
Zhen Li ◽  
Shujie Pang ◽  
Xiaona Li ◽  
Chuang Dong ◽  
...  
Keyword(s):  
Solid Solution ◽  
High Performance ◽  
Particle Morphology ◽  
Precipitation Strengthening ◽  
Second Phase ◽  
High Entropy ◽  
Second Phase Particles ◽  
Alloy Strength ◽  
Solid Solution Matrix ◽  
The Relationship

High-performance conventional engineering materials (including Al alloys, Mg alloys, Cu alloys, stainless steels, Ni superalloys, etc.) and newly-developed high entropy alloys are all compositionally-complex alloys (CCAs). In these CCA systems, the second-phase particles are generally precipitated in their solid-solution matrix, in which the precipitates are diverse and can result in different strengthening effects. The present work aims at generalizing the precipitation behavior and precipitation strengthening in CCAs comprehensively. First of all, the morphology evolution of second-phase particles and precipitation strengthening mechanisms are introduced. Then, the precipitation behaviors in diverse CCA systems are illustrated, especially the coherent precipitation. The relationship between the particle morphology and strengthening effectiveness is discussed. It is addressed that the challenge in the future is to design the stable coherent microstructure in different solid-solution matrices, which will be the most effective approach for the enhancement of alloy strength.

scholarly journals Concurrence of spinodal decomposition and nano-phase precipitation in a multi-component AlCoCrCuFeNi high-entropy alloy

2019 ◽  
Vol 8 (1) ◽  
pp. 726-736 ◽  
Author(s):  
Yue Zhang ◽  
Zheng Chen ◽  
Dongdong Cao ◽  
Jinyong Zhang ◽  
Ping Zhang ◽  
...  
Keyword(s):  
Spinodal Decomposition ◽  
High Entropy Alloy ◽  
Phase Precipitation ◽  
High Entropy

scholarly journals Superior Slurry Erosion Behavior of a Casting NiCoCrFeNb0.45 Eutectic High Entropy Alloy

2020 ◽  
Vol 33 (8) ◽  
pp. 1111-1116
Author(s):  
Jinling Lu ◽  
Zhenjiang Wang ◽  
Wei Wang ◽  
Kexuan Zhou ◽  
Feng He ◽  
...  
Keyword(s):  
High Entropy Alloy ◽  
Slurry Erosion ◽  
High Entropy ◽  
Erosion Behavior

scholarly journals Computational analysis of solid particle-erosion produced by bottom ash slurry in 90° elbow

2019 ◽  
Vol 252 ◽  
pp. 04008
Author(s):  
Jashanpreet Singh ◽  
Jatinder Pal Singh ◽  
Mandeep Singh ◽  
Miroslaw Szala
Keyword(s):  
Bottom Ash ◽  
Outer Wall ◽  
Wall Region ◽  
Erosion Wear ◽  
Slurry Erosion ◽  
Low Velocity ◽  
Drag Forces ◽  
Shape Pattern ◽  
Discrete Phase ◽  
Computational Fluid Dynamics Cfd

Present work is devoted to investigation of the slurry erosion wear in a 90° elbow by using commercial Computational fluid dynamics (CFD) code FLUENT. Discrete phase erosion wear model was used to predict erosion in 90° elbow by solving the governing equations through Euler-Lagrange scheme. Particle tracking was considered by using standard k-ε turbulence scheme for the flow of bottom ash slurry. Erosion wear in elbow was investigated along with velocity distribution and turbulence intensity. The radius-to-diameter (r/D) ratio was taken as 1.5. Results show that erosion rate increases with increase in velocity. Present numerical simulation model holds close agreement with previous studies. Distorted patterns appeared at low velocities. The V-shape pattern appeared on the outer wall of elbow at high velocities. The low velocity region occurs around circumference of elbow wall at outer wall of elbow due to stimulation of the drag forces near the wall region.

Inhomogeneous Deformation in Thin Films

1995 ◽  
Vol 39 ◽  
pp. 627-635
Author(s):  
I. C. Noyan ◽  
C. C. Goldsmith
Keyword(s):  
Thin Films ◽  
Residual Stresses ◽  
Second Phase ◽  
Thermal Coefficient ◽  
Stress Distributions ◽  
Stress Determination ◽  
Phase Precipitation ◽  
Reliable Operation ◽  
X Ray ◽  
Layer Thin Film

Residual stresses are a major factor in the reliable operation of multi-layer thin film structures. These stresses may form due to defect incorporation during deposition, recrystallization, second-phase precipitation, thermal coefficient of expansion (TCE) mismatch, etc., as well as local plastic flow, delamination or cracking. In the literature, residual stresses are usually assumed to be constant in the plane of the film. This assumption is sometimes implicitly made, as in the cases where only two psi-tilts are used in the stress determination with the sin2Ψ analysis.In this paper, we will review the possible causes of heterogeneous stress distributions in thin films and discuss their impact on x-ray stress determination techniques using some new data from W films.

Microstructures and Wear Resistance of Al1.5CrFeNiTi0.5 and Al1.5CrFeNiTi0.5W0.5 High Entropy Alloy Coatings Manufactured by Laser Cladding

2019 ◽  
Vol 956 ◽  
pp. 154-159 ◽  
Author(s):  
Hui Liang ◽  
Bing Yang Gao ◽  
Ya Ning Li ◽  
Qiu Xin Nie ◽  
Zhi Qiang Cao
Keyword(s):  
Wear Resistance ◽  
Laser Cladding ◽  
Dendritic Structure ◽  
Laves Phase ◽  
High Entropy Alloy ◽  
Second Phase ◽  
Laves Phases ◽  
High Entropy ◽  
Two Phases ◽  
Bcc Phase

For the purpose of expanding the application scope of HEA coating manufactured on the surface modification of materials, in this work, the Al1.5CrFeNiTi0.5 and Al1.5CrFeNiTi0.5W0.5 HEA coatings were successfully manufactured using laser cladding method on SUS304. The microstructures and wear resistance of coatings are researched systematically. It is found that the W0 and W0.5 HEA coatings all exhibit the dendritic structure, which are constituted by BCC phases and Laves phases. With W element addition, the phase structures of W0.5 coating remain unchanged. W is dissolved in both two phases, but the solid solubility in Laves phase is higher compared to that in BCC phase. W0.5 coating with the highest microhardness of 848.34 HV, and the W0 coating with the microhardness of 811.45 HV, both of whose microhardness are four times more than that of SUS304 substrate. Among all samples, the W0.5 coating shows the optimal wear performance because of its larger content of hard second phase ( Laves phase).

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