Unveiling the interplay of deformation mechanisms in a metastable high entropy alloy with tuned composition using synchrotron X-ray diffraction

Ni-Cr-Si-Al-Ta resistive thin films were prepared on glass and Al2O3substrates by DC magnetron cosputtering from targets of Ni0.35-Cr0.25-Si0.2-Al0.2casting alloy and Ta metal. Electrical properties and microstructures of Ni-Cr-Si-Al-Ta films under different sputtering powers and annealing temperatures were investigated. The phase evolution, microstructure, and composition of Ni-Cr-Si-Al-Ta films were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Auger electron spectroscopy (AES). When the annealing temperature was set to 300°C, the Ni-Cr-Si-Al-Ta films with an amorphous structure were observed. When the annealing temperature was at 500°C, the Ni-Cr-Si-Al-Ta films crystallized into Al0.9Ni4.22, Cr2Ta, and Ta5Si3phases. The Ni-Cr-Si-Al-Ta films deposited at 100 W and annealed at 300°C which exhibited the higher resistivity 2215 μΩ-cm with −10 ppm/°C of temperature coefficient of resistance (TCR).

Download Full-text

Comparing CALPHAD predictions with high energy synchrotron radiation X-ray diffraction measurements during in situ annealing of Al0.3CoCrFeNi high entropy alloy

Materialia ◽

10.1016/j.mtla.2020.100784 ◽

2020 ◽

Vol 12 ◽

pp. 100784 ◽

Cited By ~ 1

Author(s):

C.R. Reynolds ◽

Z. Herl ◽

N.A. Ley ◽

D. Choudhuri ◽

J.T. Lloyd ◽

...

Keyword(s):

Synchrotron Radiation ◽

High Energy ◽

High Entropy Alloy ◽

X Ray Diffraction ◽

X Ray ◽

High Entropy

Download Full-text

Effect of V and Ti on the Oxidation Resistance of WMoTaNb Refractory High-Entropy Alloy at High Temperatures

Metals ◽

10.3390/met12010041 ◽

2021 ◽

Vol 12 (1) ◽

pp. 41

Author(s):

Shuaidan Lu ◽

Xiaoxiao Li ◽

Xiaoyu Liang ◽

Wei Yang ◽

Jian Chen

Keyword(s):

Oxidation Resistance ◽

High Temperatures ◽

Elevated Temperatures ◽

Early Stage ◽

Mass Gain ◽

High Entropy Alloy ◽

High Entropy Alloys ◽

X Ray Diffraction ◽

X Ray ◽

High Entropy

Alloying with V and Ti elements effectively improves the strength of WMoTaNb refractory high entropy alloys (RHEAs) at elevated temperatures. However, their effects on the oxidation resistance of WMoTaNb RHEAs are unknown, which is vitally important to their application at high temperatures. In this work, the effect of V and Ti on the oxidation behavior of WMoTaNb RHEA at 1000 °C was investigated using a thermogravimetric system, X-ray diffraction and scanning electron microscopy. The oxidation of all alloys was found to obey a power law passivating oxidation at the early stage. The addition of V aggravates the volatility of V2O5, MoO3 and WO3, and leads to disastrous internal oxidation. The addition of Ti reduces the mass gain in forming the full coverage of passivating scale and prolongs the passivation duration of alloys.

Download Full-text

Interfacial Reaction of CoCrFeNi High Entropy Alloy in Molten Al

Materials Science Forum ◽

10.4028/www.scientific.net/msf.944.176 ◽

2019 ◽

Vol 944 ◽

pp. 176-181

Author(s):

Yao Hu ◽

Jun Tao He ◽

Yu Cai Wu ◽

Yong Dong ◽

Zheng Rong Zhang

Keyword(s):

Solid Solution ◽

High Entropy Alloy ◽

X Ray Diffraction ◽

X Ray ◽

High Entropy ◽

Solid Solution Layer ◽

Bcc Structure ◽

Solution Layer ◽

Al Matrix ◽

Dipping Time

In this paper, we studied the element diffusion behaviors of the multi-principal CoCrFeNi high entropy alloy in molten Al at 700°C. Microstructure, structure and microhardness in the diffusion interfaces of CoCrFeNi and Al are studied by the X-ray diffraction, the scanning electron microscopy, the energy spectrometry, and the microhardness tester. The results showed that a complex chemical reaction occurred at the interface between the high-entropy alloy and the Al. A mixture of FCC + BCC solid solution layer was first formed. Then a bulk Al13Cr2 compound formed near the Al of the solid solution layer. With the increase of dipping time, the thickness of the solid solution layer remained unchanged, and the compounds gradually changed into spheres distributed in the Al matrix. The formation of BCC structure makes the hardness of the solid solution layer up to 450HV, and the existence of the compound also increases the hardness of the Al matrix significantly.

Download Full-text

Microstructure Characterization of Laser Clad TiVCrAlSi High Entropy Alloy Coating on Ti-6Al-4V Substrate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.154-155.621 ◽

2010 ◽

Vol 154-155 ◽

pp. 621-625 ◽

Cited By ~ 6

Author(s):

Can Huang ◽

Yong Zhong Zhang ◽

Rui Vilar

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Alloy Coating ◽

High Entropy Alloy ◽

X Ray Diffraction ◽

X Ray ◽

High Entropy ◽

Bcc Phase ◽

Scanning Electron

Due to the promising properties of high entropy alloy, TiVCrAlSi high entropy alloy coating was prepared on Ti-6Al-4V alloy surface by laser cladding. The microstructure and phase analysis of as-cast TiVCrAlSi alloy and laser clad coating were characterized by scanning electron microscope and X-ray diffraction. The results indicate that as-cast TiVCrAlSi alloy is mainly composed of (Ti,V)5Si3 and bcc phase. The laser clad coating is metallurgically bonded to the substrate with few pores and cracks. Laser clad TiVCrAlSi coating is also composed of (Ti,V)5Si3 and bcc phases.

Download Full-text

X-ray Diffraction and EBSD Study of Al-Ti-Co-Ni-Fe High-Entropy Alloy

Acta Physica Polonica A ◽

10.12693/aphyspola.130.991 ◽

2016 ◽

Vol 130 (4) ◽

pp. 991-992 ◽

Cited By ~ 1

Author(s):

K. Górecki ◽

P. Bała ◽

G. Cios ◽

M. Stępień ◽

T. Kozieł ◽

...

Keyword(s):

High Entropy Alloy ◽

X Ray Diffraction ◽

X Ray ◽

High Entropy

Download Full-text

Structural Features of InPbGaSnCu Molten High Entropy Alloy

Фізика і хімія твердого тіла ◽

10.15330/pcss.20.4.432-436 ◽

2019 ◽

Vol 20 (4) ◽

pp. 432-436

Author(s):

S.I. Mudry ◽

R.M. Bilyk ◽

R.Ye. Ovsianyk ◽

Yu.O. Kulyk ◽

T.M. Mika

Keyword(s):

Liquid State ◽

Pair Correlation ◽

Diffraction Method ◽

Structural Features ◽

High Entropy Alloy ◽

X Ray Diffraction ◽

X Ray ◽

High Entropy ◽

Structure Factors ◽

Constituent Elements

X-ray diffraction method has been carried out to study the structure in the equiatomic InPbGaSnCu high entropy alloy in liquid state. Structure factors and pair correlation functions have been analyzed and used to determine the main structure parameters. Existence of shoulder on right hand side of principal peak and its transformation was the main feature of structure factors. Comparison of structure functions and main parameters obtained from them for multicomponent alloy with ones for constituent elements shown that mixing process is related with formation of structural inhomogeneities in liquid state.

Download Full-text

An Evaluation of Microstructure and Hardness Properties of Zr Added FeNiAlCoCr High Entropy Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.846.20 ◽

2016 ◽

Vol 846 ◽

pp. 20-26 ◽

Cited By ~ 4

Author(s):

Rafidah Razuan ◽

Mohamad Kamal Harun ◽

Mahesh Talari

Keyword(s):

High Entropy Alloy ◽

X Ray Diffraction ◽

X Ray ◽

High Entropy ◽

Arc Melting ◽

Melting Technique ◽

Fcc Phase ◽

Xrd Patterns ◽

Hardness Values ◽

Fesem Micrographs

High Entropy Alloy (HEA) with at least 5 elements with equimolar ratios were developed to investigate the characteristics of Zr added in FeNiAlCoCrZrx (x=0.0, 0.2, 0.4, 0.6, 0.8 and 1.0). HEAs were prepared by arc melting technique in Ar atmosphere and were remelted five times to ensure homogeneity. The microstructure and phase constitution of these alloys are examined by X-Ray diffraction (XRD) and Scanning Electron Microscope (SEM). The results show that addition of Zr to FeNiAlCoCr HEA resulted in multiple solid solution phases viz., BCC1, BCC2, FCC1 and FCC2 as evidenced by XRD patterns. Furthermore, presence of both BCC and FCC phases at higher Zr additions suggests that Zr did not preferentially promoted the solidification of either BCC or FCC phase. It can be observed from the FESEM micrographs that with different Zr additions, solidified microstructures of FeNiAlCoCrZrx alloys varied between completely eutectic microstructures to proeutectic and eutectic phase mixtures. From FESEM micrographs it can be suggested that different Zr contents have resulted in different solidification modes. Hardness of Zr added samples is higher compared to base HEA which is FeNiAlCoCr. It was observed that hardness values are higher when proeutectic phases were present compared to completely eutectic FeNiAlCoCrZr alloy (x=0.1).

Download Full-text

Microwave Synthesis of AlFeCuCrNi /TiB2 High-Entropy Alloy Matrix Composites

MATEC Web of Conferences ◽

10.1051/matecconf/201823802004 ◽

2018 ◽

Vol 238 ◽

pp. 02004 ◽

Cited By ~ 1

Author(s):

Lijuan Lan ◽

Tianjiao Pu ◽

Yingying Gu ◽

Chengyan Zhu ◽

Heguo Zhu

Keyword(s):

Volume Fraction ◽

High Entropy Alloy ◽

Matrix Composites ◽

X Ray Diffraction ◽

Alloy Matrix ◽

X Ray ◽

High Entropy ◽

The Matrix ◽

Modern Analysis ◽

Geometric Morphology

The Al-Fe-Cu-Cr-Ni-Ti-B system was microwaved to generate high entropy alloy matrix composites reinforced by TiB2 particles. The micro structure and reaction process of the composites were observed and investigated by modern analysis methods, including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and differential scanning calorimeter (DSC) analysis. The results show that AlFeCuCrNi /TiB2 composites can be prepared by microwave heating method. The matrix structure was FCC, and the reinforcement TiB2 showed regular geometric morphology in the matrix and evenly distributed in the matrix when the volume fraction of the reinforcement is 10%. When the volume fraction of the reinforcement increased to 15%, TiB2 partially aggregates in the matrix, and the system activation energy was 195.69 kJ/mol.

Download Full-text