scholarly journals Microstructure and Corrosion Performance of Aluminium Matrix Composites Reinforced with Refractory High-Entropy Alloy Particulates

2021 ◽  
Vol 11 (3) ◽  
pp. 1300
Author(s):  
Elias Ananiadis ◽  
Konstantinos T. Argyris ◽  
Theodore E. Matikas ◽  
Athanasios K. Sfikas ◽  
Alexandros E. Karantzalis
Keyword(s):  
Corrosion Behaviour ◽  
Aluminium Matrix ◽  
High Entropy Alloy ◽  
Matrix Composites ◽  
Nacl Solution ◽  
Aluminium Matrix Composites ◽  
High Entropy ◽  
Matrix Reinforcement ◽  
Corrosion Mechanisms ◽  
Hardness Values

Novel aluminium matrix composites reinforced by MoTaNbVW refractory high-entropy alloy (HEA) particulates have been fabricated by powder metallurgy. The microstructure of the produced composites has been studied and the corrosion behaviour assessed in 3.5% NaCl solution. The composites exhibited low porosity, good homogeneity, few defects, and good distribution of the reinforcing phase in the Al matrix. No secondary intermetallic phases have been formed while the interface between matrix/reinforcement showed good bonding with no signs of reactivity. Increasing the volume of the reinforcing phase leads to increased hardness values. Al-HEA composites exhibited susceptibility to localised forms of corrosion in 3.5% NaCl solution. The microstructure has been analysed and corrosion mechanisms have been formulated.

scholarly journals Influence of Processing Conditions on the Micro-Mechanical Properties of Particulate-Reinforced Aluminium Matrix Composites

2008 ◽  
Vol 17 (3) ◽  
pp. 096369350801700 ◽  
Author(s):  
D. P. Myriounis ◽  
S. T. Hasan ◽  
T. E. Matikas
Keyword(s):  
Heat Treatment ◽  
Aluminium Matrix ◽  
Matrix Composites ◽  
Processing Conditions ◽  
Alloy Matrix ◽  
Aluminium Matrix Composites ◽  
The Matrix ◽  
Solute Atoms ◽  
Matrix Reinforcement ◽  
Non Equilibrium

During processing, metal matrix attempts to deform and this deformation plays the key role in the microstructural events of segregation and precipitation at the matrix-reinforcement interface. The important aspect of this behaviour is to identify the strengthening micro-characteristics which enhance the material's interphasial reactions in order to improve the bonding properties of the matrix-reinforcement interface. This work focuses on the non-equilibrium segregation which arises due to imbalances in point defect concentrations set up around interfaces during non-equilibrium heat treatment processing of SiC particle reinforced aluminium matrix composites. The important factors affecting the heat treatment process are the temperature, the cooling rate, the concentration of solute atoms and the binding energy between solute atoms and vacancies. Aluminium – silicon – magnesium alloy matrix reinforced with varying amounts of silicon carbide particles were used in this study. Samples in the as-received and heat treated condition were examined by microstructural and microhardness analyses. Based on the analysis, it has been observed that the macroscopic mechanical behaviour of the composite is influenced by several factors including the manufacturing process, the processing conditions, the inter-particle distance, as well as the mean size and the percentage of reinforcement.

scholarly journals Tribological Behaviour of MoS2 and Graphite Reinforced Aluminium Matrix Composites

2021 ◽  
Vol 1059 (1) ◽  
pp. 012021
Author(s):  
A. Saravanakumar ◽  
D. Ravikanth ◽  
L. Rajeshkumar ◽  
D. Balaji ◽  
M. Ramesh
Keyword(s):  
Aluminium Matrix ◽  
Matrix Composites ◽  
Tribological Behaviour ◽  
Aluminium Matrix Composites

scholarly journals Al Matrix Composites Reinforced by Ti and C Dedicated to Work at Elevated Temperature

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3114
Author(s):  
Bartosz Hekner ◽  
Jerzy Myalski ◽  
Patryk Wrześniowski ◽  
Tomasz Maciąg
Keyword(s):  
Working Conditions ◽  
Elevated Temperatures ◽  
Aluminium Matrix ◽  
Carbon Surface ◽  
Matrix Composites ◽  
Time Intervals ◽  
Aluminium Matrix Composites ◽  
Al Matrix Composites ◽  
Microstructure Of The Material ◽  
Al Matrix

In this paper, the applicability of aluminium matrix composites to high-temperature working conditions (not exceeding the Al melting point) was evaluated. The behaviour of Al-Ti-C composites at elevated temperatures was described based on microstructural and phase composition observations for composites heated at temperatures of 540 and 600 °C over differing time intervals from 2 to 72 h. The materials investigated were aluminium matrix composites (AMC) reinforced with a spatial carbon (C) structure covered by a titanium (Ti) layer. This layer protected the carbon surface against contact with the aluminium during processing, protection which was maintained for the material’s lifetime and ensured the required phase compositions of Al4C3 phase limitation and AlTi3 phase creation. It was also proved that heat treatment influenced not only phase compositions but also the microstructure of the material, and, as a consequence, the properties of the composite.

scholarly journals In Situ Synthesis of Core-Shell-Structured SiCp Reinforcements in Aluminium Matrix Composites by Powder Metallurgy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1201
Author(s):  
Xinghua Ji ◽  
Cheng Zhang ◽  
Shufeng Li
Keyword(s):  
Particle Size ◽  
Powder Metallurgy ◽  
Shell Structure ◽  
Ex Situ ◽  
Aluminium Matrix ◽  
Core Shell ◽  
Matrix Composites ◽  
Aluminium Matrix Composites ◽  
Core Shell Structure

SiCp reinforced aluminium matrix composites (AMCs), which are widely used in the aerospace, automotive, and electronic packaging fields along with others, are usually prepared by ex situ techniques. However, interfacial contamination and poor wettability of the ex situ techniques make further improvement in their comprehensive performance difficult. In this paper, SiCp reinforced AMCs with theoretical volume fractions of 15, 20, and 30% are prepared by powder metallurgy and in situ reaction via an Al-Si-C system. Moreover, a combined method of external addition and an in situ method is used to investigate the synergistic effect of ex situ and in situ SiCp on AMCs. SiC particles can be formed by an indirect reaction: 4Al + 3C → Al4C3 and Al4C3 + 3Si → 3SiC + 4Al. This reaction is mainly through the diffusion of Si, in which Si diffuses around Al4C3 and then reacts with Al4C3 to form SiCp. The in situ SiC particles have a smooth boundary, and the particle size is approximately 1–3 μm. A core-shell structure having good bonding with an aluminium matrix was generated, which consists of an ex situ SiC core and an in situ SiC shell with a thickness of 1–5 μm. The yield strength and ultimate tensile strength of in situ SiCp reinforced AMCs can be significantly increased with a constant ductility by adding 5% ex situ SiCp for Al-28Si-7C. The graphite particle size has a significant effect on the properties of the alloy. A criterion to determine whether Al4C3 is a complete reaction is achieved, and the forming mechanism of the core-shell structure is analysed.

Sign in / Sign up

Export Citation Format

Share Document