DSC sample preparation for Al-based alloys

Starink, M.J.; Hobson, A; Gregson, P.J.

doi:10.1016/1359-6462(96)00036-x

Cited by 25 publications

(28 citation statements)

References 21 publications

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“…It is further interesting to note that combination of data obtained by the present authors and coworkers [4,12,13,41,43,44] yields a detailed picture of how peaks A and B change in response to thermo-mechanical treatments. Compared to WQ samples, peak A is drastically reduced when 8090 is a) quenched at a slower rate (see also Ref.…”

Section: Identification Of Precipitatesmentioning

confidence: 99%

“…For further details of experiments and analysis methods see Refs. [4,12,31]. All curves are corrected for the difference between the heat capacity of the sample and reference, i.e.…”

Section: Methodsmentioning

confidence: 99%

“…7 shows that the volume fraction of GPB zones formed during ageing decreases strongly when SiC is added to the 8090 alloy and decreases further with decreasing Li content of the MMCs. The former is due to the elimination of vacancies caused by the dislocations generated around misfitting SiC particles, as vacancies are necessary for formation of GPB zones [4]. This misfit of SiC with § This value for n may indicate that in the monolithic 8090 alloy the rate of S' formation and growth during isothermal ageing is effectively governed by a 1 dimensional diffusion process [6,34].…”

Section: Kinetics Of the Microstructure Developmentmentioning

confidence: 99%

“…[1,2]). Apart from this direct effect the presence of ceramic inclusions will also influence the precipitation in the matrix [1,3,4] and thus influence strengthening in an indirect way.…”

Section: Aimsmentioning

confidence: 99%

“…[1,2]). Apart from this direct effect the presence of ceramic inclusions will also influence the precipitation in the matrix [1,3,4] and thus influence strengthening in an indirect way. The main aim of the present work and the companion paper [5] is to derive and validate a complete microstructure-property model for reinforced and unreinforced Al-Li-Cu-Mg type alloys and link this model with a novel model for the kinetics of microstructure development.…”

mentioning

confidence: 99%

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Microstrucure and strengthening of Al–Li–Cu–Mg alloys and MMCs: I. Analysis and Modelling of Microstructural changes

et al. 1999

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A complete and detailed analysis of the microstructural development during ageing in an 8090 (Al-2.3Li-1.2Cu-1Mg-0.1Zr) alloy, an 8090/20wt%SiC p MMC, an Al-1.5Li-Cu-Mg MMC and an Al-Cu-Mg MMC (all with similar Cu and Mg contents) has been performed. Volume fractions of all precipitates relevant for precipitation strengthening of the alloys (δ' phase, S' phase and GPB zones) have been determined using a recently derived method based on differential scanning calorimetry (DSC). The volume fractions have subsequently been successfully fitted using a novel model for transformation kinetics. The sizes of these precipitates have been analysed using newly derived expressions consistent with the latter model. As a result of dislocation generation around misfitting SiC particles the volume fractions of both GPB zones and S' phase depend strongly on the presence of these particles. Also the amount of Li present in the alloys influences the volume fractions of the phases significantly. The sizes of S' are similar for the four alloys. Introduction AimsMonolithic Al-based alloys for structural applications are generally strengthened by 4 basic mechanisms: precipitation strengthening, solution strengthening, grain and subgrain strengthening and strengthening by dislocations. The first two mechanisms depend strongly on composition of the alloy and on heat treatment and are generally employed in a metastable state, whilst the latter two mechanisms depend mostly on thermo-mechanical processing routes. In metal matrix composites (MMCs) additionally load transfer to ceramic inclusions in the matrix can increase the strength of the alloy (see e.g. [1,2]). Apart from this direct effect the presence of ceramic inclusions will also influence the precipitation in the matrix [1,3,4] and thus influence strengthening in an indirect way. The main aim of the present work and the companion paper [5] is to derive and validate a complete microstructure-property model for reinforced and unreinforced Al-Li-Cu-Mg type alloys and link this model with a novel model for the kinetics of microstructure development.

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Section: Identification Of Precipitatesmentioning

confidence: 99%

“…For further details of experiments and analysis methods see Refs. [4,12,31]. All curves are corrected for the difference between the heat capacity of the sample and reference, i.e.…”

Section: Methodsmentioning

confidence: 99%

Section: Kinetics Of the Microstructure Developmentmentioning

confidence: 99%

“…[1,2]). Apart from this direct effect the presence of ceramic inclusions will also influence the precipitation in the matrix [1,3,4] and thus influence strengthening in an indirect way.…”

Section: Aimsmentioning

confidence: 99%