Single-phase rare-earth high-entropy zirconates with superior thermal and mechanical properties

2022 ◽  
Author(s):  
Xuewei Luo ◽  
Lirong Luo ◽  
Xiaofeng Zhao ◽  
Huangyue Cai ◽  
Shuaishuai Duan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Single Phase ◽  
Thermal And Mechanical Properties ◽  
High Entropy

Development of Single-Phase Bcc UHfNbTi High-Entropy Alloy with Excellent Mechanical Properties

2021 ◽  
Author(s):  
J. Shi ◽  
Y.W. Zhao ◽  
Chunli Jiang ◽  
Y.Z. Zhang ◽  
Dongli Zou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Phase ◽  
High Entropy Alloy ◽  
High Entropy

scholarly journals Elastic, Mechanical and Thermophysical properties of Single-Phase Quaternary ScTiZrHf High-Entropy Alloy

2021 ◽  
Vol 22 (4) ◽  
pp. 687-696
Author(s):  
Sachin Rai ◽  
Navin Chaurasiya ◽  
Pramod K. Yadawa
Keyword(s):  
Mechanical Properties ◽  
Elastic Constants ◽  
Room Temperature ◽  
Single Phase ◽  
Mechanical Characterization ◽  
Ultrasonic Attenuation ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Different Temperatures ◽  
Ultrasonic Parameters

Consequent to the interaction potential model, the high-order elastic constants at high entropy alloys in single-phase quaternary ScTiZrHf have been calculated at different temperatures. Elastic constants of second order (SOECs) helps to determine other ultrasonic parameters. With the help of SOECs other elastic moduli, bulk modulus, shear modulus, Young’s modulus, Pugh’s ratio, elastic stiffness constants and Poisson’s ratio are estimated at room temperature for elastic and mechanical characterization. The other ultrasonic parameters are calculated at room temperature for elastic and mechanical characterization. The temperature variation of ultrasonic velocities along the crystal's z-axis is evaluated using SOECs. The temperature variation of the  average debye velocity and the thermal relaxation time (τ) are also estimated along this orientation axis. The ultrasonic properties correlated with elastic, thermal and mechanical properties which is temperature dependent is also discussed. The ultrasonic attenuation due to phonon – phonon (p-p) interactions is also calculated at different temperatures. In the study of ultrasonic attenuation such as a function of temperature, thermal conductivity appears to be main contributor and p- p interactions are the responsible reason of attenuation and found that the mechanical properties of the high entropy alloy ScTiZrHf are superior at room temperature.

Effect of Nb Addition on Microstructure and Thermal and Mechanical Properties of Fe-Co-Ni-Cu-Cr Multiprincipal-Element (High-Entropy) Alloys in As-Cast and Heat-Treated State

JOM ◽  
2019 ◽  
Vol 71 (10) ◽  
pp. 3481-3489 ◽  
Author(s):  
A. Yu. Churyumov ◽  
A. V. Pozdniakov ◽  
A. I. Bazlov ◽  
H. Mao ◽  
V. I. Polkin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Entropy Alloys ◽  
Thermal And Mechanical Properties ◽  
High Entropy ◽  
Heat Treated ◽  
Nb Addition ◽  
Treated State

Development of single-phase bcc UHfNbTi high-entropy alloy with excellent mechanical properties

2021 ◽  
pp. 130822
Author(s):  
J. Shi ◽  
Y.W. Zhao ◽  
C.L. Jiang ◽  
X. Wang ◽  
Y.Z. Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Single Phase ◽  
High Entropy Alloy ◽  
High Entropy

Thermal and mechanical properties of rare earth-doped ceria ceramics

1999 ◽  
Vol 61 (1) ◽  
pp. 31-35 ◽  
Author(s):  
Soichiro Sameshima ◽  
Tatsuhiko Ichikawa ◽  
Manabu Kawaminami ◽  
Yoshihiro Hirata
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Doped Ceria ◽  
Thermal And Mechanical Properties ◽  
Rare Earth Doped

Effect of rare earth Y addition on the microstructure and mechanical properties of high entropy AlCoCrCuNiTi alloys

2010 ◽  
Vol 31 (3) ◽  
pp. 1599-1602 ◽  
Author(s):  
Zhaohua Hu ◽  
Yongzhong Zhan ◽  
Guanghua Zhang ◽  
Jia She ◽  
Chunhui Li
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
High Entropy ◽  
Microstructure And Mechanical Properties

scholarly journals High-entropy Rare-earth Zirconate Ceramics With Low Thermal Conductivity for Advanced Thermal Barrier Coatings

2021 ◽  
Author(s):  
Baosehng Xu ◽  
Debao LIU ◽  
Baolu SHI ◽  
Liyan GENG ◽  
Yiguang WANG ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Rare Earth ◽  
Thermal Barrier Coatings ◽  
High Speed ◽  
Solid State Reaction Method ◽  
Thermal Barrier ◽  
Excellent Thermal Stability ◽  
Barrier Coatings ◽  
High Entropy

Abstract In this work, we have successfully fabricated a novel high-entropy rare-earth zirconate (La0.2Nd0.2Sm0.2Gd0.2Yb0.2)2Zr2O7 (5RE2Zr2O7) ceramics and its counterparts by using a new high-speed grinding strategy combined with typical solid-state reaction method. The X-ray diffraction (XRD) and Raman spectroscopy analysis indicated that the as-prepared 5RE2Zr2O7 ceramics performed single-phase defect fluorite-type structures with highly sintering resistant and excellent thermal stability. The possibility of formation of 5RE2Zr2O7 was verified via first-principles calculations. Meanwhile, the phase structure, thermophysical and mechanical properties of the samples were systematically investigated. The results showed that the 5RE2Zr2O7 ceramics demonstrated lower thermal conductivity (0.9-1.72 W·m-1·K-1) and higher thermal expansion coefficients (10.9 × 10-6 K-1 at 1273 K) than its counterparts. Furthermore, the 5RE2Zr2O7 ceramics presented outstanding mechanical properties including large Young’s modulus (186-257 GPa), higher fracture toughness and lower brittleness index than that of YSZ. Therefore, in view of various excellent properties, the as-prepared 5RE2Zr2O7 ceramics possess great potential for applications in the field of thermal barrier coatings.

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