Cu‐Al‐Mn alloys are promising materials for industrial applications because of their excellent workability and low transformation stress. In this work, Cu‐Al‐Mn alloys with compositions in the range of 64.8–78.23 at% Cu, 12.2–31.6 at% Al, and 0–17.87 at% Mn were synthesized via arc melting, and their martensitic transformation temperature and latent heat were investigated. The austenite finish temperature ( A f ) decreased with increasing Al or Mn composition ratios. The latent heat of the transformation from the martensitic to austenitic phase showed a maximum value of 7.216 J g −1 for 70.4Cu‐23.8Al‐5.86Mn. A correlation between the latent heat, average martensitic transformation start temperature, and A f ( T 0 ) was observed. The latent heat increased with increasing T 0 , up to 20.55°C, and decreased at higher temperatures. This positive correlation was consistent with the Clausius–Clapeyron equation. The composition containing only the phases involved in the martensitic transformation exhibited a higher latent heat than the composition with unrelated phases at the same transformation temperature. This has led to interesting results that contribute to the study of solid‐state refrigerants using Cu‐Al‐Mn alloys.
TOMIOKA et al. (Thu,) studied this question.