Precipitation processes in Al–Mg–Si extending down to initial clustering revealed by the complementary techniques of positron lifetime spectroscopy and dilatometry

L. Resch*, G. Klinser, E. Hengge, R. Enzinger, M. Luckabauer, W. Sprengel, R. Würschum

*Corresponding author for this work

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4 Citations (Scopus)
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Abstract

The design of specific material properties of aluminum alloys demands for a detailed understanding of clustering and precipitation processes occurring during heat treatments. Positron lifetime spectroscopy in combination with high-precision dilatometry measurements were taken, allowing for a comprehensive analysis of the aging mechanisms occurring on different timescales and in different temperature regimes, during artificial aging. From the results, unambiguous experimental evidence for the following three main steps of the precipitation process is obtained. In the first seconds of artificial aging, a competitive process of dissolution and growth of different cluster types occurs. Subsequently, clusters start to transform into coherent precipitates, which are mainly responsible for the hardening effect. For prolonged artificial aging, the number density of the coherent precipitates increases, while positron lifetime spectroscopy already reveals the simultaneous formation of less coherent precipitates.

Original languageEnglish
Pages (from-to)14657-14665
Number of pages9
JournalJournal of materials science
Volume53
Issue number20
DOIs
Publication statusPublished - 1 Oct 2018
Externally publishedYes

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Positrons
Aging of materials
Spectroscopy
Precipitates
Hardening
Aluminum alloys
Materials properties
Dissolution
Heat treatment
Temperature

Cite this

@article{92cd68590d574305ae9c2a5b6bc07e65,
title = "Precipitation processes in Al–Mg–Si extending down to initial clustering revealed by the complementary techniques of positron lifetime spectroscopy and dilatometry",
abstract = "The design of specific material properties of aluminum alloys demands for a detailed understanding of clustering and precipitation processes occurring during heat treatments. Positron lifetime spectroscopy in combination with high-precision dilatometry measurements were taken, allowing for a comprehensive analysis of the aging mechanisms occurring on different timescales and in different temperature regimes, during artificial aging. From the results, unambiguous experimental evidence for the following three main steps of the precipitation process is obtained. In the first seconds of artificial aging, a competitive process of dissolution and growth of different cluster types occurs. Subsequently, clusters start to transform into coherent precipitates, which are mainly responsible for the hardening effect. For prolonged artificial aging, the number density of the coherent precipitates increases, while positron lifetime spectroscopy already reveals the simultaneous formation of less coherent precipitates.",
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Precipitation processes in Al–Mg–Si extending down to initial clustering revealed by the complementary techniques of positron lifetime spectroscopy and dilatometry. / Resch, L.; Klinser, G.; Hengge, E.; Enzinger, R.; Luckabauer, M.; Sprengel, W.; Würschum, R.

In: Journal of materials science, Vol. 53, No. 20, 01.10.2018, p. 14657-14665.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Precipitation processes in Al–Mg–Si extending down to initial clustering revealed by the complementary techniques of positron lifetime spectroscopy and dilatometry

AU - Resch, L.

AU - Klinser, G.

AU - Hengge, E.

AU - Enzinger, R.

AU - Luckabauer, M.

AU - Sprengel, W.

AU - Würschum, R.

PY - 2018/10/1

Y1 - 2018/10/1

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AB - The design of specific material properties of aluminum alloys demands for a detailed understanding of clustering and precipitation processes occurring during heat treatments. Positron lifetime spectroscopy in combination with high-precision dilatometry measurements were taken, allowing for a comprehensive analysis of the aging mechanisms occurring on different timescales and in different temperature regimes, during artificial aging. From the results, unambiguous experimental evidence for the following three main steps of the precipitation process is obtained. In the first seconds of artificial aging, a competitive process of dissolution and growth of different cluster types occurs. Subsequently, clusters start to transform into coherent precipitates, which are mainly responsible for the hardening effect. For prolonged artificial aging, the number density of the coherent precipitates increases, while positron lifetime spectroscopy already reveals the simultaneous formation of less coherent precipitates.

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