The Improvement in Ordered Phase Transformation Temperature of Cu75Fe05Pd20 Alloy for Advanced Engineering Applications

Abstract

Cu–Fe–Pd alloys have great versatility and the promise of extensive applications across numerous fields of industry and have become a focal point of scientific inquiry and exploration. The effect of order-disorder phase transformation on structure and thermal properties has been investigated in ternary Cu₇₅Fe₀₅Pd₂₀ alloy by using high-temperature X-ray diffraction and differential scanning calorimetry. High-temperature X-ray diffraction experiments for the sample pre-annealed at 723 K have revealed the formation of an L1₂‑type ordered structure up to 805 K and disordered face centered cubic (f.c.c.) structure above 805 K. The lattice parameter is observed to be larger than that predicted by Vegard’s rule. This is due to the fact that the addition of Fe weakens the interatomic forces in the alloy. The integrated intensity data was used to determine thermal parameters. The phase transition occurring at T_c is of the first order because a sudden change in lattice parameter and linear thermal expansion coefficient is observed. These parameters collectively suggest that the investigated alloys could be advantageous for the automobile and space industries.