Hardness and compressive properties of negative thermal expansion ceramic ZrMgMo3O12 reinforced 2024Al composites.

This work investigated the Vickers hardness and compressive properties of 0–30 % ZrMgMo 3 O 12p /2024Al composites with controlled thermal expansion. The composites exhibited superior Vickers hardness and compressive properties, highly dependent on the ZrMgMo 3 O 12 content. Under identical preparation conditions, an increase in ZrMgMo 3 O 12 content allows for adjusting the Vickers hardness from 163 to 280 HV and the compressive yield strength from 330 to 702 MPa. Additionally, the 5 % and 10 % ZrMgMo 3 O 12 composites exhibited 23 % and 8 % compressive strains, respectively. The Orowan strengthening effect of the ZrMgMo 3 O 12 particles and the thermal mismatch stress at the particle-matrix interface were identified as the key strengthening mechanisms for the composites. However, excessive stress can lead to interfacial debonding and composite failure. Agglomeration of the ZrMgMo 3 O 12 particles was observed beyond 10 % content. At 30 %, the thermal mismatch stress exceeded the binding strength, causing interfacial debonding and composite failure. The controlled mechanical properties of the 0–30 % ZrMgMo 3 O 12p /2024Al composites indicate a promising potential for application in the aerospace and automotive industries and electronics and optical instruments sectors. [ABSTRACT FROM AUTHOR]