Study of structural and mechanical behaviour of Al-ZrO2 metal matrix nanocomposites prepared by powder metallurgy method

The present paper reports the investigations on sintering and hardness behavior of Fe-Al2O3 Metal Matrix Nanocomposites (MMNCs) prepared by Powder Metallurgy (P/M) route with varying concentration of Al2O3 (5–30 wt%). The MMNC specimens for the present investigations were synthesized by ball milling, followed by compaction and sintering in an inert atmosphere in the temperature range of 900–1100°C for 1–3 hours using Powder Metallurgy route. Phase and microstructures of the specimens were characterized by XRD and SEM. Reactive sintering takes place in these materials. During sintering nano iron aluminate (FeAl2O4) phase forms. Characterization was done by measuring density and hardness. Results have been discussed critically to illustrate the effect of various processing parameters on sintering and mechanical behavior. It is expected that the results of these investigations will be useful in developing Metal Matrix Nanocomposites (MMNCs) for typical industrial applications.

Download Full-text

Microstructural Characterization and Mechanical Behaviour of SiC and Kaoline Reinforced Aluminium Metal Matrix Composites Fabricated Through Powder Metallurgy Technique

Silicon ◽

10.1007/s12633-021-01154-9 ◽

2021 ◽

Author(s):

V. S. S. Venkatesh ◽

Ashish B. Deoghare

Keyword(s):

Powder Metallurgy ◽

Metal Matrix Composites ◽

Mechanical Behaviour ◽

Metal Matrix ◽

Microstructural Characterization ◽

Matrix Composites ◽

Powder Metallurgy Technique ◽

Aluminium Metal

Download Full-text

Fabrication and Characterization of the Modified EV31-Based Metal Matrix Nanocomposites

Metals ◽

10.3390/met11010125 ◽

2021 ◽

Vol 11 (1) ◽

pp. 125

Author(s):

Seyed Kiomars Moheimani ◽

Mehran Dadkhah ◽

Mohammad Hossein Mosallanejad ◽

Abdollah Saboori

Keyword(s):

Thermal Expansion ◽

Mechanical Strength ◽

Metal Matrix ◽

Coefficient Of Thermal Expansion ◽

Structural Effect ◽

Metal Matrix Nanocomposites ◽

Mechanical Stirring ◽

Specific Strength ◽

The Matrix ◽

Matrix Nanocomposites

Metal matrix nanocomposites (MMNCs) with high specific strength have been of interest for numerous researchers. In the current study, Mg matrix nanocomposites reinforced with AlN nanoparticles were produced using the mechanical stirring-assisted casting method. Microstructure, hardness, physical, thermal and electrical properties of the produced composites were characterized in this work. According to the microstructural evaluations, the ceramic nanoparticles were uniformly dispersed within the matrix by applying a mechanical stirring. At higher AlN contents, however, some agglomerates were observed as a consequence of a particle-pushing mechanism during the solidification. Microhardness results showed a slight improvement in the mechanical strength of the nanocomposites following the addition of AlN nanoparticles. Interestingly, nanocomposite samples were featured with higher electrical and thermal conductivities, which can be attributed to the structural effect of nanoparticles within the matrix. Moreover, thermal expansion analysis of the nanocomposites indicated that the presence of nanoparticles lowered the Coefficient of Thermal Expansion (CTE) in the case of nanocomposites. All in all, this combination of properties, including high mechanical strength, thermal and electrical conductivity, together with low CTE, make these new nanocomposites very promising materials for electro packaging applications.

Download Full-text

Wettability in Metal Matrix Composites

Metals ◽

10.3390/met11071034 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1034

Author(s):

Massoud Malaki ◽

Alireza Fadaei Tehrani ◽

Behzad Niroumand ◽

Manoj Gupta

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Aluminum Matrix ◽

Interfacial Strength ◽

High Strength ◽

Aluminum Matrix Composites ◽

Matrix Composites ◽

Metal Matrix Nanocomposites ◽

Aerospace Applications ◽

Matrix Nanocomposites

Metal matrix composites (MMCs) have been developed in response to the enormous demand for special industrial materials and structures for automotive and aerospace applications, wherein both high-strength and light weight are simultaneously required. The most common, inexpensive route to fabricate MMCs or metal matrix nanocomposites (MMNCs) is based on casting, wherein reinforcements like nanoceramics, -carbides, -nitrides, elements or carbon allotropes are added to molten metal matrices; however, most of the mentioned reinforcements, especially those with nanosized reinforcing particles, have usually poor wettability with serious drawbacks like particle agglomerations and therefore diminished mechanical strength is almost always expected. Many research efforts have been made to enhance the affinity between the mating surfaces. The aim in this paper is to critically review and comprehensively discuss those approaches/routes commonly employed to boost wetting conditions at reinforcement-matrix interfaces. Particular attention is paid to aluminum matrix composites owing to the interest in lightweight materials and the need to enhance the mechanical properties like strength, wear, or creep resistance. It is believed that effective treatment(s) may enormously affect the wetting and interfacial strength.

Download Full-text