Influence mechanisms of Cu or Fe on the microstructures and tensile properties at 350 °C of network AlNp reinforced Al composites.

In this work, the influences of alloying elements like Cu and Fe on the microstructures and tensile properties (at 350 °C) of network AlN p reinforce Al composites have been studied. After alloying element introduction, Cu atoms tend to segregate on the AlN p /Al interface, while Fe atoms not. Meanwhile, the α–Al grains show a 〈111〉 Al fiber texture in the AlN p reinforced Al composites with Cu addition and a {110} Al 〈111〉 Al texture in the AlN p reinforced Al composites containing Fe, which are different from the random α–Al orientations in the AlN p /Al composites without element addition. The tensile properties of AlN p /Al composites containing alloying elements at 350 °C are affected by the preferred orientations of α–Al grains and the changes of dislocation density. The elongation of the composites containing Cu increased remarkably from 3.5% to 14% with just little tensile strength sacrifice at 350 °C. Nevertheless, after Fe incorporation, the tensile strength is increased to 140 MPa, coupled with the elongation of 7% at 350 °C. [ABSTRACT FROM AUTHOR]