Bainite precipitation in a Cu-Al-Mn-Gd shape memory alloy

Autor(es)

Oliveira, A. B. ^[1] ; Peixoto, E. B. ^{[2, 3]} ; Duque, J. G. S. ^[2] ; Silva, L. S. ^[1] ; Silva, R. A. G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo ICAQF, Diadema, SP - Brazil

^[2] Univ Fed Sergipe, Itabaiana, Sergipe - Brazil

^[3] Inst Fed Alagoas, Campus Piranhas, BR-57460000 Piranhas, AL - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALIA; v. 16, MAY 2021.
• Citações Web of Science: 0

Resumo

In this study, the aging effects and bainite formation kinetics in the Cu71.2Al18.6Mn10.2 and Cu69.7Al18.9Mn10.3Gd1.10 shape memory alloys are evaluated using different experimental techniques. The results show that the Cu71.2Al18.6Mn10.2 and Cu69.7Al18.9Mn10.3Gd1.10 alloys exhibit aging hardening during bainite precipitation, reaching hardness values at about 370 HV. It is verified that the ferromagnetic beta(3) phase is produced during the bainite precipitation on the aging. The kinetic process is evaluated, and for the Cu69.7Al18.9Mn10.3Gd1.10 alloy, the activation energy value is similar to 42 kJ.mol(-1) while the alloy without Gd presents an activation energy value at about 62 kJ mol(-1). Gadolinium modifies the reaction mechanism analyzed due to their interaction with beta(1) and alpha phases, and the phase decomposition with Gd. In the studied alloys the bainite formation shows to be strongly related to the diffusive processes. (AU)

• Processo FAPESP: 19/06717-0 - Estudo da estabilidade de fases em ligas multicomponentes
• Beneficiário: Ricardo Alexandre Galdino da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular