Open Access

Table 5

Properties of composites based on oxides.

Reinforcement Production approach Properties achieved References
n-TiO2 Equal channel angular pressing (ECAP) Compact density 90% of theoretical density, hardness 3.72 GPa/344 VHN and Young's modulus 92 GPa. Compacts consolidated by 4 ECAP passes at 473 K had highest density and high compressive strength of nearly 1.7 GPa [12]
Al2O3 Mechanical alloying and hot press sintering Hardness and compressive strength of Al2O3/7075 composites first increased and then decreased with Al2O3 quantity increasing, and 5 wt.% Al2O3 addition made the material displayed superior comprehensive mechanical properties.
The tribological properties also indicated that 5 wt.% Al2O3 nanoparticle significantly improved the high-temperature wear resistance of 7075 alloys
Al2O3 High-pressure torsion (HPT) The initial hardness Hv167 after HPT increased to nearly Hv260.
Tensile testing at 623K demonstrated the potential for achieving true super plasticity in the HPT-processed MMC with a maximum elongation of nearly 670% when testing at a strain rate of 1.0 × 10−2 s−1
n-Al2O3 Ultrasonic vibration Compared to the hardness of AA7075(VHN94.7), the hardness of Al2O3/7075 composites (VHN113.8) increased by nearly 20%.
Compared to the hardness of Al2O3/7075 composites (VHN 113.8), the hardness of Al2O3/7075 composites under solution treatment (VHN150.4) at 480°C for 5 h increased by nearly 32%.
Hardness of Al2O3/7075 composites under optimum T6 heat treatment (VHN173.5) increased by nearly 52%
Al2O3 Squeeze casting The hardness of the composite is 59 HRB.
The compressive strength is 587 MPa
ZrO2 PM By the planetary ball mill, a full dispersion of the ZrO2 through the matrix is achieved.
In the case of the Simoloyer mill, the results showed that there was not a fine dispersion of the ZrO2. particles.
The shaker mill produced the best results, because full dispersion of the ZrO2 particles took place in a homogeneous way in half the time taken by the other mills tested

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