Results of a Differential Scanning Calorimetry (DSC) investigation on precipitation hardening in solubilized 6061 aluminum alloy and its composites reinforced with SiC whiskers are reported. The exothermic and endothermic effects in DSC traces of these materials (in the solubilized state) have been attributed to phase formation and reversion on the base of the 6061 AA ageing sequence described in previous TEM studies. Apparent activation energies have been calculated according to the Ozawa method in non-isothermal conditions. The ageing sequence in composites is analogous to that of 6061 AA. It was found that the SiC whiskers reinforcement accelerates many steps of the ageing sequence. G.P. zone reversion and β' and β phase precipitations happen at lower temperatures in composite materials than in 6061 AA. The apparent activation energy for β' formation calculated for aluminum alloy and its composite gave rather similar results. The handbook solubilization method reported for 6061 alloy could not allow a complete dissolution of alloying elements for the composite.

DSC study of ageing sequence in 6061 aluminium alloy - SiC whiskers composite / Badini, CLAUDIO FRANCESCO; Marino, Francesco; Tomasi, A.. - In: MATERIALS CHEMISTRY AND PHYSICS. - ISSN 0254-0584. - 25:1(1990), pp. 57-70. [10.1016/0254-0584(90)90007-W]

DSC study of ageing sequence in 6061 aluminium alloy - SiC whiskers composite

BADINI, CLAUDIO FRANCESCO;MARINO, Francesco;
1990

Abstract

Results of a Differential Scanning Calorimetry (DSC) investigation on precipitation hardening in solubilized 6061 aluminum alloy and its composites reinforced with SiC whiskers are reported. The exothermic and endothermic effects in DSC traces of these materials (in the solubilized state) have been attributed to phase formation and reversion on the base of the 6061 AA ageing sequence described in previous TEM studies. Apparent activation energies have been calculated according to the Ozawa method in non-isothermal conditions. The ageing sequence in composites is analogous to that of 6061 AA. It was found that the SiC whiskers reinforcement accelerates many steps of the ageing sequence. G.P. zone reversion and β' and β phase precipitations happen at lower temperatures in composite materials than in 6061 AA. The apparent activation energy for β' formation calculated for aluminum alloy and its composite gave rather similar results. The handbook solubilization method reported for 6061 alloy could not allow a complete dissolution of alloying elements for the composite.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/1396806
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo