On the stability of Guinier-Preston zones in an Al–1.87 at % Cu alloy at elevated temperature

Schmidt, U.; Zahba, A.; Schülbe, R.; Löffler, H.

doi:10.1002/pssa.2210950107

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The pre-ageing treatments a t RT and 70 "C are referred to only for comparison. This discussion can be improved taking additionally into account the recently published results about the structure changes proceeding in this alloy during the post-ageing a t 100 and 130 "C [15,19].…”

Section: Introdtietionmentioning

confidence: 99%

On the Stability of Metastable Precipitates in an Al–1.87 at% Cu Alloy at Elevated Temperature

Schülbe

Schmidt

Siebert

1986

phys. stat. sol. (a)

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The reversion behaviour of an AlCu(1.87) alloy is investigated by microhardness (HV) measurements and SAXS in dependence on the pre‐ageing temperature (Tpre = RT, 70, and 100 °C) and the pre‐ageing time (0 ≦ tpre ≦ 100 d). The subsequent reversion treatment is performed at Trev = 160 °C. The stability of the metastable precipitates against the reversion at Trev increases with Tpre and in case of constant Tpre with pre‐ageing duration. Therefore it is not possible to determine a fixed solvus line. Partial reversion at Trev = 160 °C doesn't accelerate the rehardening, contrary to the results at Trev = 130 °C. Simultaneously performed TEM investigations support the results of the HV and Q0 investigations.

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Section: Introdtietionmentioning

confidence: 99%

On the Stability of Metastable Precipitates in an Al–1.87 at% Cu Alloy at Elevated Temperature

Schülbe

Schmidt

Siebert

1986

phys. stat. sol. (a)

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The effect of manganese additions on the structure changes proceeding in rapidly solidified Al‐Cu alloys

Dzuong¹,

Löffler

Thang³

et al. 1987

Cryst. Res. Technol.

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The effect of Mn additions (0 ... 2 wt%) on the decomposition of rapidly solidified Al-1.0 wtyo Cu alloys (cooling rate lo3 to lo4 K/s; LQ treatment) were studied during ageing 1 letween RT and 450 "C by hardness, X-ray methods and electron microscopy. The results were compared with alloys homogenized in the region of the solid solution (SQ treatment).(i) The LQ treatment results in a quite better homogeneous distribution of the aIIoyed < lements than the SQ one, t h a t is less particles of intermetallic phases are present in the as-. i nst state. (ii) A t T < 250 "C Mn additions affect the decomposition kinetics by trapping trf vacancies (retardation) and the diminution of the solubility of Cu atoms (acceleration). The first effect dominates in the stage of G.P. zone formation, the second one during preci-1)itation of intermediate phases. (iii) At T 2 300 "C the intermetallic compound Cu,Mn,Al,, Jorms associated with a significant increase of the hardness. Der EinflulS von Mn-Zugaben (0 ... 2 wt%) auf die Entmischung schnell kristallisierter 41-4.0 wt% Cu-Legierungen (Abkiihlgeschwindigkeit von lo3 bis lo4 K/s; LQ-Behandlung) wurde mittels HBrtemessungen, Rontgenmethoden und Elektronenmikroskopie whhrend .ler Alterung zwischen RT und 450 "C untersucht. Die Ergebnisse wurden mit Legierungen verglichen, die aus dem Bereich der homogenen festen Losung abgeschreckt wurden (SQ-Behandlung).

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Compilation of the Results of Reversion Investigations of Al–1.87 at% Cu Alloys

Schülbe

Schmidt

1987

Phys. Stat. Sol. (a)

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The results of the reversion experiments on Al–1.87 wt% Cu alloys, previously published by the authors, are summarized with the aim to test the different conceptions of reversion. In addition to the hitherto reported results selected two‐ and three‐step‐ageing processes are evaluated, which support the conceptions of the reversion in Al–1.87 wt% Cu alloys. According to the respective results the partial reversion in this alloy exhibits three features, i.e. the two hitherto known mechanisms, viz. the critical nuclear size and the growth, are effectively influenced by a third one. It is attributed to the different possible GPZ structures.

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On the stability of Guinier-Preston zones in an Al–1.87 at % Cu alloy at elevated temperature

Cited by 3 publications

References 14 publications

On the Stability of Metastable Precipitates in an Al–1.87 at% Cu Alloy at Elevated Temperature

On the Stability of Metastable Precipitates in an Al–1.87 at% Cu Alloy at Elevated Temperature

The effect of manganese additions on the structure changes proceeding in rapidly solidified Al‐Cu alloys

Compilation of the Results of Reversion Investigations of Al–1.87 at% Cu Alloys

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