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dc.contributor.authorAmrane, Chahira
dc.contributor.authorHamana, Djamel
dc.date.accessioned2018-05-10T14:18:57Z
dc.date.available2018-05-10T14:18:57Z
dc.date.issued2018-04-24
dc.identifier.urihttp://hdl.handle.net/123456789/136325
dc.description.abstractThe Al-Mg alloys are widely used in industry especially for marine applications since they possess good properties such as general corrosion resistance, strength, weldability, weight compared to other Al alloys and formability. These properties are related to the magnesium content and to the applied heat treatments. These alloys undergo phase transitions by precipitation which improves their mechanical properties following solution heat treatments and suitable ageing ones. Although these alloys are already well studied, the questions concerning the stability of the microstructure and the effect of the various heat treatments are always asked. In this work, we present a study on the evolution of the precipitation (continuous one) reactions after quenching, more precisely the evolution of the precipitated phases (formation, coalescence, and dissolution), in Al-(12, 10 and 8)wt.% Mg alloys aged at 150 and 250 °C during different ageing times. The use of various experimental techniques as differential dilatometry, differential scanning calorimetry, scanning and transmission electron microscopy, X-ray diffraction, microhardness and internal friction measurements, shows their importance and their complementarity in the study of ageing process in these alloys. The obtained results clarified the parameters that govern the stage of β’and β particles appearance and the mechanical responses to the applied heat treatments. The ageing effect of a supersaturated solid solution on the Temperature Dependent Internal Friction (TDIF) spectra has been studied. A detailed TDIF analysis revealed the sensibility of the internal friction technique to the formation of semi-coherent and non-coherent phases (β' and β) but not enough to the formation of coherent phases (GP zones). Several observations on the nature and the shape of the precipitates are also discussed.fr_FR
dc.language.isofrfr_FR
dc.publisherجامعة الإخوة منتوري قسنطينةfr_FR
dc.subjectAl-Mgfr_FR
dc.subjectvieillissementfr_FR
dc.subjectprécipitationfr_FR
dc.subjectfrottement intérieurfr_FR
dc.subjectmicrostructurefr_FR
dc.subjectpropriétés mécaniquesfr_FR
dc.subjectAl-Mg alloysfr_FR
dc.subjectageingfr_FR
dc.subjectprecipitationfr_FR
dc.subjectinternal frictionfr_FR
dc.subjectmicrostructurefr_FR
dc.subjectmechanical propertiesfr_FR
dc.subjectسبائكfr_FR
dc.subjectAl-Mgالتعتيقfr_FR
dc.subjectالترسيبfr_FR
dc.subjectالاحتكاك الداخليfr_FR
dc.subjectالبنية المجهريةfr_FR
dc.subjectالخصائص الميكانيكيةfr_FR
dc.titleEtude des réactions de précipitation continue et des propriétés mécaniques des alliages à base d’aluminium.fr_FR
dc.typeThesisfr_FR


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