Microstructure and mechanical properties of PM Ni 56 Fe 19 Al 25 alloy

Abstract

Scanning electron microscopy and X-ray diffraction analysis were used to study microstructure and mechanical properties of PM Ni₅₆Fe₁₉Al₂₅ alloy. The results indicate that as sintered specimen is (β+γ) dual phase structure, and its density is 6·54 g cm⁻³ (the relative density is 94·0%), tensile strength is 771 MPa and the total strain is 4·3%. As quenched specimen presents a large superelasticity with the maximum recovery strain of 4·5%, and its tensile strength is 850 MPa and the total strain is 9·2%. The fracture modes of Ni₅₆Fe₁₉Al₂₅ alloy is transgranular, intergranular and tough mixed type.