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

被引：8

作者：

Oliveira, A. B. ^{[1
]}

Peixoto, E. B. ^{[2
,3
]}

Duque, J. G. S. ^{[2
]}

Silva, L. S. ^{[1
]}

Silva, R. A. G. ^{[1
]}

机构：

[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

来源：

MATERIALIA | 2021年 / 16卷

基金：

巴西圣保罗研究基金会;

关键词：

Bainite precipitation; Cu-Al-Mn alloys; Gd addition; Hardness; Phase transition; PHASE-TRANSFORMATIONS; MAGNETIC-PROPERTIES; BEHAVIOR; TRANSITIONS; SEPARATION; STABILITY;

D O I：

10.1016/j.mtla.2021.101101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：13

共 29 条

[1] Ag precipitation and dissolution reactions in the Cu-3 wt.% Al-4 wt.% Ag alloy [J].