Structural characteristics and thermal stability of Al-5.7Cr-2.5Fe-1.3Ti alloy produced by powder metallurgy

Structure, room temperature- and elevated temperature mechanical properties of the Al-5.7Cr-2.5Fe-1.3Ti alloy are studied in the presented paper. The alloy was prepared by the powder metallurgy including melt atomization into rapidly solidified powder followed by hot extrusion. The alloy shows a fine-grained structure (average grain size of 1 μm) and a relatively high tensile strength of 380 MPa. Variations in structure, hardness and tensile properties due to the long-term annealing at 400 deg. C/200 h are negligible, suggesting the excellent thermal stability of the alloy. Moreover, its tensile properties at 350 deg. C exceed the commercial Al-Si alloy commonly used in elevated temperature applications.