Thickening of T1 Precipitates during Aging of a High Purity Al−4Cu−1Li−0.25Mn Alloy

dc.contributor.authorHäusler, Ines
dc.contributor.authorKamachali, Reza Darvishi
dc.contributor.authorHetaba, Walid
dc.contributor.authorSkrotzki, Birgit
dc.date.accessioned2019-08-02T19:41:35Z
dc.date.available2019-08-02T19:41:35Z
dc.date.issued2018-12-21
dc.date.updated2019-08-01T17:22:42Z
dc.description.abstractThe age hardening response of a high-purity Al–4Cu–1Li–0.25Mn alloy (wt. %) during isothermal aging without and with an applied external load was investigated. Plate shaped nanometer size T1 (Al2CuLi) and θ′ (Al2Cu) hardening phases were formed. The precipitates were analyzed with respect to the development of their structure, size, number density, volume fraction and associated transformation strains by conducting transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) studies in combination with geometrical phase analysis (GPA). Special attention was paid to the thickening of T1 phase. Two elementary types of single-layer T1 precipitate, one with a Li-rich (Type 1) and another with an Al-rich (Defect Type 1) central layer, were identified. The results show that the Defect Type 1 structure can act as a precursor for the Type 1 structure. The thickening of T1 precipitates occurs by alternative stacking of these two elementary structures. The thickening mechanism was analyzed based on the magnitude of strain associated with the precipitation transformation normal to its habit plane. Long-term aging and aging under load resulted in thicker and structurally defected T1 precipitates. Several types of defected precipitates were characterized and discussed. For θ′ precipitates, a ledge mechanism of thickening was observed. Compared to the normal aging, an external load applied to the peak aged state leads to small variations in the average sizes and volume fractions of the precipitates.en
dc.description.sponsorshipDFG, 237105621, SPP 1713: Stark gekoppelte thermo-chemische und thermo-mechanische Zustände in Angewandten Materialienen
dc.identifier.eissn1996-1944
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/9705
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-8745
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subject.ddc500 Naturwissenschaften und Mathematikde
dc.subject.otherAl-Cu-Li-alloyen
dc.subject.otherprecipitationen
dc.subject.otherT1 precipitateen
dc.subject.othermicrostructure evolutionen
dc.subject.otherthickeningen
dc.subject.othercreepen
dc.subject.othervolume fractionen
dc.subject.othernumber densityen
dc.subject.otherstrain differenceen
dc.titleThickening of T1 Precipitates during Aging of a High Purity Al−4Cu−1Li−0.25Mn Alloyen
dc.typeArticleen
dc.type.versionpublishedVersionen
dcterms.bibliographicCitation.articlenumber30en
dcterms.bibliographicCitation.doi10.3390/ma12010030en
dcterms.bibliographicCitation.issue1en
dcterms.bibliographicCitation.journaltitleMaterialsen
dcterms.bibliographicCitation.originalpublishernameMDPIen
dcterms.bibliographicCitation.originalpublisherplaceBaselen
dcterms.bibliographicCitation.volume12en
tub.accessrights.dnbfreeen
tub.affiliationFak. 2 Mathematik und Naturwissenschaften::Inst. Optik und Atomare Physik::FG Elektronenmikroskopie und -holographiede
tub.affiliation.facultyFak. 2 Mathematik und Naturwissenschaftende
tub.affiliation.groupFG Elektronenmikroskopie und -holographiede
tub.affiliation.instituteInst. Optik und Atomare Physikde
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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