The improved mechanical properties of Al matrix composites reinforced with oriented β-Si3N4 whisker

In this work, SiC and Cu particles were utilized to enhance the thermal and mechanical properties of Al matrix composites. The ball-milling and cold-compact methods were applied to prepare Al matrix composites, and the uniform distribution of SiC and Cu particles in the composite confirms the validity of our preparation method. After characterizing the thermal conductivity and the compressibility of the prepared composites, results show that small particles have a higher potential to improve compressibility than large particles, which is attributed to the size effect of elastic modulus. The addition of SiC to the Al matrix will improve the compressibility behavior of Al matrix composites, and the compressibility can be enhanced by 100% when SiC content is increased from 0 to 30%. However, the addition of SiC particles has a negative effect on thermal conductivity because of the low thermal conductivity of SiC particles. The addition of Cu particles to Al-SiC MMCs could further slightly improve the compressibility behavior of Al-SiC/Cu MMCs, while the thermal conductivity could be enhanced by about 100% when the Cu content was increased from 0 to 30%. To meet the need for low density and high thermal conductivity in applications, it is more desirable to enhance the specific thermal conductivity by enlarging the preparation pressure and/or sintering temperature. This work is expected to supply some information for preparing Al matrix composites with low density but high thermal conductivity and high compressibility.

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Microstructure, mechanical properties and machinability of particulate reinforced Al matrix composites: a comparative study between SiC particles and high-entropy alloy particles

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2020.09.034 ◽

2020 ◽

Vol 9 (6) ◽

pp. 13646-13660

Author(s):

Tiwen Lu ◽

Tianbing He ◽

Zixuan Li ◽

Hongyu Chen ◽

Xiaoliang Han ◽

...

Keyword(s):

Mechanical Properties ◽

Comparative Study ◽

High Entropy Alloy ◽

Matrix Composites ◽

High Entropy ◽

Sic Particles ◽

Alloy Particles ◽

Al Matrix Composites ◽

Particulate Reinforced ◽

Al Matrix

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Effect of Reinforcement Addition on Microstructure and Mechanical Properties of Al Matrix Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.515 ◽

2014 ◽

Vol 989-994 ◽

pp. 515-518

Author(s):

Guo Jun Ma ◽

Yu Tian Ding ◽

Pei Peng Jin

Keyword(s):

Mechanical Properties ◽

Ductile Failure ◽

Interface Debonding ◽

Matrix Composites ◽

Matrix Interface ◽

Composite Image ◽

Properties Of Materials ◽

Al Matrix Composites ◽

Al Matrix ◽

Fracture Nucleation

The study investigates the influence of different fraction of Mg2B2O5 whiskers (5, 10, 15 and 20vol.% ) on the microstructure of the hot extruded composite as well as on the mechanical properties in the same condition. The results indicate that the process is available for producing the composite, image analysis shows the whisker tends to cluster together with increasing content of reinforcement. When the content of the reinforcement is 10%, the composites exhibit the best mechanical properties, meanwhile, it demonstrate cluster is unfavorable to the improvement of properties of materials. The ductile failure of 6061Al matrix, the reinforcement fracture and the whisker-matrix interface debonding acted as the main mechanism of fracture nucleation.

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