Tensile behavior of a nanostructured Al-8Fe-2Mo-2V-1Zr alloy

초록

A rapidly solidified Al-Fe based alloy is considered to potential structural material for engine part application, because the alloy has a low density and high tensile strength that are suitable for improving engine performance and fuel efficiency. In this study, a rapidly solidified Al-8Fe-2Mo-2V-1Zr (wt.%) alloy was produced by a spray forming method, and the spray formed material was subsequently extruded using various extrusion ratios and temperatures. So that, the influence of extrusion condition on the microstructure and tensile properties for the spray formed alloys was investigated. Transmission and scanning electron microscopes and X-ray diffractometer were used for microstructural characterization. Tensile tests were carried out in air at a temperature range from room temperature to 673K. When extrusion was performed with a condition of extrusion ratio of 8.5 and temperature of 673K, the average grain size was determined to about 500nm and very fine (about 50nm in size) dispersoids including an Al-Fe based intermetallic phase were exhibited in the grains. It was revealed that yield strength tends to increase with increasing extrusion ratio and with decreasing extrusion temperature.