Article
Materials Science, Multidisciplinary
Akshay Kumar, Alok Singh, Amit Suhane, Ashish Kumar Singh, Pradip Kumar Verma
Summary: An Mg-Si-based 6082 aluminium metal matrix composite reinforced with varying concentrations of CoCrFeMnNi high-entropy alloy particles (HEAp) was processed through stir-squeeze casting. The composites were heat treated to examine the age-hardening effect on microstructural changes, fracture mechanism, and the interface between HEAp and aluminium matrix. The evolution of microstructure and topography of the fractured surface was investigated to characterize the precipitate and intermetallic compound formed at the Al/HEAp interface. The tensile test was performed to investigate the correlation between tensile strength and artificial ageing. Under the T6 condition, the composites exhibit superior mechanical properties, such as improved hardness, yield strength, and ultimate tensile strength. However, the ductility of the composites is lower compared to the as-cast condition due to the formation of precipitates.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Y. L. Wang, L. Zhao, D. Wan, S. Guan, K. C. Chan
Summary: Utilizing laser-engineered net shaping technology, near-fully dense high-entropy alloy (HEA) matrix composites reinforced with TiB2 nanoparticles were successfully fabricated, showing improved strength and superior wear resistance properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Kaiguang Luo, Hanqing Xiong, Yun Zhang, Hao Gu, Zhide Li, Charlie Kong, Hailiang Yu
Summary: AA1050 metal matrix composites (MMCs) reinforced by Al0.5CoCrFeNi high-entropy alloy particles (HEAp) were prepared using stir casting and subsequent rolling techniques. The addition of 3 wt% HEAp led to a significant increase in ultimate tensile strength compared to AA1050. Cryorolling showed better mechanical properties than room temperature rolling, with increasing differences in mechanical properties observed with higher rolling deformation and lower HEAp content. The presence of voids in MMCs after room temperature rolling was not observed in cryorolled MMCs, highlighting the impact of cryogenic temperatures on microvoids and mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
H. Geng, B. Chen, J. Wan, J. Shen, K. Kondoh, J. S. Li
Summary: Many studies have shown that carbon nanotubes (CNTs) can significantly strengthen pure aluminum and this study investigates whether the same strengthening effect can be achieved in a high-strength aluminum alloy. The results showed that while both composites had the same tensile strength, CNTs had a stronger reinforcing effect in pure aluminum than in the aluminum alloy, suggesting the influence of the matrix on the strengthening behavior of CNTs in aluminum matrix composites.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Rafal Kozera, Anna Boczkowska, Zuzanna D. Krawczyk, Paulina Kozera, Maciej Spychalski, Marcin Malek, Robert Kosturek
Summary: The main goal of this study was to evaluate the interfacial strength of carbon fibres/aluminium matrix interface based on different composite fabrication methods, and to investigate the influence of a Ni-P coating on the C-fibres. The interfacial strength of the samples fabricated using the high-pressure infiltration method was measured using the push-out method.
Article
Materials Science, Multidisciplinary
Kaiguang Luo, Shilei Liu, Hanqing Xiong, Yun Zhang, Charlie Kong, Hailiang Yu
Summary: The effect of different mass fractions of HEAp on the microstructure and mechanical properties of AMCs was studied, and it was found that AMCs containing 3% HEAp exhibited the best mechanical properties. The fracture mechanism changed with increasing HEAp content.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Akshay Kumar, Alok Singh, Amit Suhane, Pradip Kumar Verma, Ashish Kumar Singh
Summary: The study investigates the impact of CoCrFeMnNi high entropy alloy (HEA) on the dry sliding wear performance of HEA/AA composites. The composites, consisting of AA 6082 alloy and various weight percentages (2%, 4%, 6%, 8%) of HEA, are fabricated using stir squeeze casting aided with an ultrasonic transducer. The results show that the HEA/AA composites exhibit improved resistance against wear and seizure at higher temperatures. The inclusion of HEA particles also affects the subsurface extent during seizure conditions.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Chemistry, Physical
Hansung Lee, Ashutosh Sharma, Byungmin Ahn
Summary: This study investigates the influence of Si addition on the microstructure, compressive strength, and fracture mechanisms of FeCoNiAlSi high-entropy alloys (HEAs). The results show that the addition of Si changes the phase structure of the alloy and increases its Vickers hardness and compressive strength. The findings suggest that HEAs with different Si contents can be used for designing high-strength structural alloys for automotive applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyan Liu, Sirui Huang, Jifeng Zhang, Jian Wu, Heguo Zhu
Summary: A series of medium-entropy alloy-based composites with in-situ y vol% TiC/Fe1.2MnCo0.8 (y = 0, 2.5, 5, 7.5, 10) were fabricated, and the influence of TiC content on the microstructure and mechanical properties was investigated. The results indicate that increasing TiC content can improve the mechanical properties of the composites within a certain range, but it also decreases the elongation.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Vikasdeep Singh Mann, O. P. Pandey
Summary: The study demonstrates the positive impact of corundum reinforcement on dry sliding wear behavior of LM30 aluminum alloy composites. The composites prepared by stir casting process exhibit uniform distribution of particles and refined microstructure, leading to improved hardness. The addition of corundum results in lower wear rate and coefficient of friction in the composites, and wear mechanism is pressure-dependent.
Article
Chemistry, Multidisciplinary
Vladimir Popov
Summary: This study demonstrates the achievement of non-agglomerated distribution of nanodiamonds in a metal matrix through mechanical alloying, lowering the starting temperature of the reaction. It also shows that existing methods cannot reduce the particle size of agglomerated nanodiamonds.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Condensed Matter
Changqing Shu, Zhengjun Yao, Xiaolin Li, Wenbo Du, Xuewei Tao, Hemei Yang
Summary: In this study, electron beam current was used to modify the surface of CoCrCuFeNiVx (x = 0, 0.6, 1.0) prepared by sintering to improve wear resistance. The results showed that V has a positive effect on reducing the enthalpy of CoCrCuFeNiVx and promoting the stabilization of FCC solid solution phase. The modified alloy exhibited a higher hardness and significantly improved wear resistance.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Engineering, Mechanical
Mustafa Okumus, Berna Bulbul
Summary: The study focused on the characterization of a new graphene oxide (GO) reinforced Al-10Ni/GO metal matrix composite fabricated by mechanical alloying technique. It was found that increasing the ball milling time and sintering temperature improved the microstructural evolutions, wear behaviour, mechanical and thermal properties of the fabricated composites. However, increasing the amount of GO reinforcement in the matrix from 1 wt% to 2 wt% adversely affected the properties of the composite.
Article
Chemistry, Physical
Jun Zhou, Hengcheng Liao, Hao Chen, Aijing Huang
Summary: A non-equiatomic high entropy alloy was successfully synthesized by mechanical alloying plus spark plasma sintering, showing higher compression yield strength and smaller grain size than alloys prepared by arc-melting method. This is mainly attributed to the combined effects of dislocation hardening, fine grain strengthening and precipitation hardening of second phase particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Composites
Cunyu Wang, Qi An, Lujun Huang, Rui Zhang, Xin Chen, Run Chen, Lin Geng, Hua-Xin Peng
Summary: In-situ (Ti,Nb)B whisker-reinforced Ti-based high-entropy alloy matrix composites with a quasi-continuous network microstructure were successfully fabricated. The composites exhibited remarkable grain refinement of the matrix and demonstrated a superior strength-ductility synergy.
COMPOSITES COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Pradip Kumar Verma, Alok Singh
Summary: This study investigates the mechanical properties and wear resistance of CoMoMnNiV high entropy alloy reinforced aluminium matrix composite processed through stir-squeeze casting assisted with an ultrasonic transducer. The results show significant improvements in mechanical properties and wear resistance, with the composite containing 8 wt% HEA demonstrating the highest resistance to wear. Optical microscopy, SEM, and an optical profilometer were used for a thorough examination of the microstructure and worn surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Materials Science, Multidisciplinary
Akshay Kumar, Alok Singh, Amit Suhane, Ashish Kumar Singh, Pradip Kumar Verma
Summary: An Mg-Si-based 6082 aluminium metal matrix composite reinforced with varying concentrations of CoCrFeMnNi high-entropy alloy particles (HEAp) was processed through stir-squeeze casting. The composites were heat treated to examine the age-hardening effect on microstructural changes, fracture mechanism, and the interface between HEAp and aluminium matrix. The evolution of microstructure and topography of the fractured surface was investigated to characterize the precipitate and intermetallic compound formed at the Al/HEAp interface. The tensile test was performed to investigate the correlation between tensile strength and artificial ageing. Under the T6 condition, the composites exhibit superior mechanical properties, such as improved hardness, yield strength, and ultimate tensile strength. However, the ductility of the composites is lower compared to the as-cast condition due to the formation of precipitates.
MATERIALS CHARACTERIZATION
(2023)
