High Temperature Mechanical Properties of an Extruded Mg–TiO2 Nano‐Composite

Abstract

The microstructure, high‐temperature shear strength, hot hardness, and creep resistance of pure Mg and its composite, reinforced with 1 vol% TiO2 nano‐particles, were investigated. The shear yield stress (SYS) and ultimate shear strength (USS), measured by the shear punch test (SPT), together with hot hardness were evaluated in the temperature range 25–225 °C. Impression creep tests were performed at 150 °C and under punching stress of 225 MPa. Depending on the test temperature, the shear yield stress (SYS) increased by 4–10 MPa, and ultimate shear strength (USS) by 4–12 MPa in the composite material. Similarly, the hardness increased by 4–8, and impression rate decreased from 10−4 to 0.3 × 10−4 mm s−1. This was attributed to the dispersive distribution of the nano‐sized TiO2 particles in the Mg matrix.