Effect of Ag additions on the β phase formation reaction in the Cu-9 wt.%Al-6 wt.%Mn alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:643

Article

Adorno, A. T.¹  Carvalho, T. M.¹  Silva, R. A. G.²  Santos, C. M. A.¹  Magdalena, A. G.¹ 

[1] UNESP, Dept Quim Fis, Inst Quim, BR-14801970 Araraquara, SP, Brazil

[2] UNIFESP, Dept Ciencias Exatas & Terra, BR-09972270 Diadema, SP, Brazil

关键词: Metals and alloys;    Solid state reactions;    Kinetics;    Thermal analysis;   

DOI  :  10.1016/j.jallcom.2014.09.206

来源: Elsevier

【 摘 要 】

The influence of 4 and 5 wt.%Ag additions on the kinetics of beta [T-7-(CuMn)(3)Al] phase formation reaction in the Cu-9 wt.%A1-6 wt.%Mn alloy was studied using differential scanning calorimetry (DSC), X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The results indicate that the conversion dependence of the activation energy has a descending shape, suggesting a multi-step process involving reversible reactions. The presence of Ag facilitates the formation of the beta phase. The results also showed that the Ag precipitates formation includes the dissolution of Mn and Al atoms, thus decreasing the partial fraction of these elements available to react. (C) 2014 Elsevier B.V. All rights reserved.

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