Effects of Sn and Gd on the (β1 + β3) stability field in the Cu-11%Al-10%Mn alloy

• Published in: Journal of thermal analysis and calorimetry Vol. 148; no. 6; pp. 2357 - 2366
• Main Authors: Souza, J. S., Silva, L. S., Bessa, C. V. X., Silva, R. A. G.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.03.2023; Springer; Springer Nature B.V
• Subjects: Alloying effects; Alloys; Aluminum; Analysis; Analytical Chemistry; Calorimetry; Chemistry; Chemistry and Materials Science; Cooling rate; Copper; Copper base alloys; Diffraction; Ferromagnetic phases; Ferromagnetism; Gadolinium; Heating; Inorganic Chemistry; Magnetization; Manganese base alloys; Martensitic transformations; Measurement Science and Instrumentation; Miscibility; Optical microscopy; Physical Chemistry; Polymer Sciences; Precipitates; Room temperature; Stability; Thermal properties; Tin; X-ray spectroscopy; X-rays; Gd addition; Cu-Al-Mn alloys; Kinetics; Miscibility gap; Sn addition
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-022-11918-z

Effects of Sn and Gd additions on the (β 1  + β 3 ) field in the Cu-11%Al-10%Mn alloy were studied by in situ X-ray diffraction, differential scanning calorimetry, non-isothermal kinetics, and magnetization measurements as a function of the temperature. The microstructures were investigated using optical microscopy and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. The results showed that the β 3 Cu 2 AlMn + β 1 Cu 3 Al → β 3 Cu 2 AlMn reaction is strongly dependent on the heating and cooling rates. The Sn addition to the Cu-11%Al-10%Mn alloy stabilizes the ferromagnetic β 3 phase. In the Sn-containing alloy, the miscibility gap transition is followed by the martensitic transformation at about 560 K. Both Sn and Gd additions have extended the stability field of the ferromagnetic β 3 phase. Nonetheless, the formation of Cu 5 Gd precipitates slows the miscibility gap transition on heating, which may be associated with the reduction of the ferromagnetic phase amount at room temperature in the Cu11%Al10%Mn3%Gd alloy.