SAXS from the G.P. Zones in Al-4 mass%Cu Alloy at Initial Stages of Ageing

The reversion behaviour of an AlCu(1.87) alloy is investigated mainly by microhardness (HV) measurements in dependence on the pre‐ageing temperature (Tpre = RT and 70 °C) and the pre‐ageing time (0 ≦ tpre ≦ 28 d). The following reversion treatment is performed at Trev = 130 °C. The GP‐zones pre‐grown at RT are less stable against reversion at 130 °C in comparison with the storing at 70 °C. The HV‐development significantly depends on the pre‐history of the samples. Recent investigations performed by means of HREM and FIM are used to interpret the quite different results of the measurements.

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On the Influence of the Pre-Ageing Conditions on the Reversion Behaviour of an Al1.87 at% Cu Alloy

Schülbe

Schmidt

1985

phys. stat. sol. (a)

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

Schmidt¹,

Zahba

Schülbe³

et al. 1986

phys. stat. sol. (a)

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The structure changes proceeding in an Al–1.87 at% Cu alloy at 100 °C are followed by microcalorimetric, hardness, and small‐angle X‐ray investigations in dependence on both, pre‐ageing tempe rature Tpre (RT and 70 °C) and pre‐ageing time tpre. The most important result is that the GP zones grown at RTare more easily transformed into GP zones able to proceed to grow at 100 °C than those formed at 70 °C. These differences are discussed in terms of the kind of the GP zones present at the end of the pre‐ageing treatment. The reversion behaviour of GP zones grown in AlZn, AlZnMg as well as in AlCu alloys is discussed.

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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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SAXS from the G.P. Zones in Al-4 mass%Cu Alloy at Initial Stages of Ageing

Cited by 4 publications

References 2 publications

On the Influence of the Pre-Ageing Conditions on the Reversion Behaviour of an Al1.87 at% Cu Alloy

On the Influence of the Pre-Ageing Conditions on the Reversion Behaviour of an Al1.87 at% Cu Alloy

On the stability of Guinier-Preston zones 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

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