Metal Matrix Composites: Fabrication, Mechanical Properties and Application

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Matrix Composites".

Deadline for manuscript submissions: 31 October 2024 | Viewed by 2000

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Guest Editor
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
Interests: carbon matrix thermal protection composites; ablation resistant materials; ablation mechanism; Cf/Al matrix composites; synthesis and characterization of metal and ceramic materials
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Special Issue Information

Dear Colleagues,

Metal matrix composites are promising materials that combine the advantages of matrix and reinforcement. They have the characteristics of good designability by adjusting the shape and content of the reinforcement, controlling the interface reaction and adopting different fabrication techniques; they will have the properties that conventional materials cannot have. They have wide application prospects in the fields of aerospace, automobile electronics, shipbuilding, etc.

This Special Issue aims to provide a platform for researchers worldwide to showcase their work in the domains of manufacturing, mechanical properties and application of metal matrix composites in recent years.

Dr. Pengchao Kang
Guest Editor

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Keywords

  • metal
  • composites
  • reinforcement
  • fabrication techniques
  • interface
  • microstructure
  • mechanical properties

Published Papers (2 papers)

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Research

21 pages, 21706 KiB  
Article
The Effect of Stearic Acid on Microstructure and Properties of (Ti2AlC + Al2O3)p/TiAl Composites
by Jiawei Zhu, Meini Yuan, Xin Pei, Xiaosheng Zhou and Maohua Li
Metals 2024, 14(4), 392; https://doi.org/10.3390/met14040392 - 27 Mar 2024
Viewed by 818
Abstract
A new type of multiphase nanoparticle-reinforced TiAl matrix composites ((Ti2AlC + Al2O3)p/TiAl composites) was successfully prepared by vacuum hot-pressing sintering using Ti powder and Al powder, which were ball-milled with different contents of stearic acid [...] Read more.
A new type of multiphase nanoparticle-reinforced TiAl matrix composites ((Ti2AlC + Al2O3)p/TiAl composites) was successfully prepared by vacuum hot-pressing sintering using Ti powder and Al powder, which were ball-milled with different contents of stearic acid (CH3(CH2)16COOH). The component, microstructure, reaction mechanism, and mechanical properties were studied. The results indicated that the composites prepared by adding stearic acid as a process control agent during the ball-milling process not only contained γ-TiAl and α2-Ti3Al phases but also Ti2AlC and Al2O3 phases. The results of SEM and TEM showed that the composites were composed of equiaxed TiAl and Ti3Al grains, and the Ti2AlC and Al2O3 particles were mainly distributed along the TiAl grain boundary in chain form, which can effectively reduce the TiAl grain size. Through the room-temperature compression test, the maximum compression stress was significantly improved in those composites that added the stearic acid, due to the reinforcement particles. The maximum compression stress was 1590 MPa with a 24.3% fracture strain. In addition, the generated crack deflection and Ti2AlC and Al2O3 particles could also enhance the toughness of the TiAl alloy. (Ti2AlC + Al2O3)p/TiAl composites generated by adding stearic acid played a key role in improving the mechanical properties of the TiAl matrix. Full article
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13 pages, 11184 KiB  
Article
A Study on the Influence of Zr on the Strengthening of the Al-10% Al2O3 Composite Obtained by Mechanical Alloying
by Alexey S. Prosviryakov, Andrey I. Bazlov, Alexander Yu. Churyumov and Anastasia V. Mikhaylovskaya
Metals 2023, 13(12), 2008; https://doi.org/10.3390/met13122008 - 13 Dec 2023
Cited by 1 | Viewed by 878
Abstract
Al2O3 is a traditional strengthening phase in aluminum matrix composites due to its high hardness and melting point. At the same time, zirconium is an important alloying element for heat-resistant aluminum alloys. However, its effect on the structure and properties [...] Read more.
Al2O3 is a traditional strengthening phase in aluminum matrix composites due to its high hardness and melting point. At the same time, zirconium is an important alloying element for heat-resistant aluminum alloys. However, its effect on the structure and properties of Al-Al2O3 composites remains unexplored at present. In this work, the effect of the addition of Zr (5 wt%) on the microstructure and strengthening of the Al-10 vol% Al2O3 composite was investigated for the first time. Composite materials with and without Zr addition were obtained through mechanical alloying as a result of ball milling for 20 h followed by multi-directional forging (MDF) at a temperature of 400 °C. OM, SEM and XRD were used to study the microstructure and its parameters. The work showed that the use of mechanical alloying and MDF contributes to the formation of dense composite samples with a nanocrystalline microstructure and a uniform distribution of alumina particles. The addition of Zr contributes to a 1.4-fold increase in the microhardness and yield strength of a compact sample at room temperature due to the formation of Al3Zr (L12) dispersoids. It was been shown that the largest contribution to the strength of both materials comes from grain boundary strengthening, which is at least 50% of the yield strength. The resulting composites exhibit high heat resistance. For example, their compressive yield strength at 350 °C is approximately 220 MPa. Full article
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