Microstructure and Mechanical Property of Fe-Al₂O₃ Nanocomposites Synthesized by Reactive Milling Followed by Spark Plasma Sintering

Abstract

The in-situ Fe based nanocomposite containing Al2O3 particle is synthesized by reactive milling of Fe2O3-Al-Fe powder mixture in toluene medium followed by consolidation of powders using Spark Plasma Sintering process. Transmission electron microscopy investigation of consolidated Fe-Al2O3 nanocomposites has shown heterogenous grain structure of Fe consisting of nano, submicron and micron size grains together with nanometer Al2O3 particles. The hardness of Fe-Al2O3 nanocomposites consolidated at 800°C is 795 MPa.

Role of CeAl11O18 in reinforcing Al2O3/Ti composites by adding CeO2

“…This process has been described in by Akin et al in detail. 24 The possible reactions existing in CeO 2 added Al 2 O 3 /Ti composites during sintering can be described by Equation (2) through Equation (5). It is found that due to the thermodynamic stability, the formation of the CeAl 11 O 18 phase occurs easily.…”

“…In order to eliminate these surface cracks, it is of great importance to improve fracture toughness to enhance crack resistance. Nowadays, the dispersion of metal particles into brittle ceramic matrixes has been extensively developed as an effective method to solve the brittleness of ceramics 2‐9 . In addition to increased mechanical properties compared to the corresponding monolithic ceramics, these ceramic‐metal composites also show novel electrical, optical, and magnetic functions, along with metal‐like machinability and superplasticity 10‐13 .…”

Fine TiC dispersed Al2O3 composites fabricated via in situ reaction synthesis and conventional process

“…Microstructural uniformity and grain size refinement are beneficial for increasing the flexural strength 15,16 . Composites with large matrix grain size are (in general) characterized by low bending strength, hardness, and wear resistance 17,18 . Large dispersed particles usually contribute to toughening of the matrix by enhancing the interactions between the second phase and cracks 19,20 .…”

“…15,16 Composites with large matrix grain size are (in general) characterized by low bending strength, hardness, and wear resistance. 17,18 Large dispersed particles usually contribute to toughening of the matrix by enhancing the interactions between the second phase and cracks. 19,20 The uniform dispersion and the size of TiC particles are affected by the starting powder and synthesis method.…”

Mechanical Properties of Composites with Titanium Diboride Fabricated by Spark Plasma Sintering

“…The disadvantages include the need to work with high direct current and relatively small size of the resulting end product [6][7][8]. In recent years, the SPS method has been widely used in the manufacture of composite materials based on copper [9,10], nickel [11,12], and aluminium [13][14][15], or iron [16][17][18]. Studies have mostly focused on optimization of the sintering process and achieving satisfactory physical, mechanical, electrical and tribological properties.…”