Hardening nanostructures in an AlZnMg alloy

Dupasquier, A.; Ferragut, R.; Iglesias, Marina; Massazza, M.; Riontino, G.; Mengucci, P.; Barucca, G.; Macchi, C.; Somoza, A.

doi:10.1080/14786430701271959

Cited by 48 publications

(66 citation statements)

References 17 publications

(19 reference statements)

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“…27 That increase has been explained by fast aggregation of Mg to vacancies already decorated with Zn atoms which appears analogous to the situation here. The interpretation was also supported by coincidence Doppler broadening (CDB) measurements.…”

Section: Lifetime Increase -Stage IIImentioning

confidence: 57%

“…It is worth noting that in Al-Mg-Zn alloys a non-monotonic evolution of lifetime has been reported recently, 27 For pure Al, the situation is well investigated. In annealed alloys with few point defects, most positrons annihilate in the bulk matrix and have a lifetime between 0.160 and 0.170 ns.…”

Section: A Comparison With the Literaturementioning

confidence: 99%

“…In Al-Mg-Zn alloys, a decrease of positron lifetime has also been observed during NA, however already after 1 hour. 27 The explanations offered there include an further enrichment in Zn and a reduction of positron trapping into defects. It would be too speculative to conclude which mechanism leads to the lifetime decrease in our case.…”

Section: Final Lifetime Decrease -Stage IVmentioning

confidence: 99%

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Kinetics of natural aging in Al-Mg-Si alloys studied by positron annihilation lifetime spectroscopy

et al. 2011

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The process of natural ageing in pure ternary Al-Mg-Si alloys was studied by positron annihilation lifetime spectroscopy in real time in order to clarify the sequence and kinetics of clustering and precipitation. It was found that natural ageing take place in at least 5 stages in these alloys, four of which were directly observed. This is interpreted as the result of complex Within the first 10 minutes after quenching, a period of nearly constant positron lifetime was found for those Mg-rich alloys that later show an insufficient hardness response to artificial ageing, the so-called 'negative effect'. The various processes observed could be described by two effective activation energies that were found by varying the ageing temperature from 10°C to 37°C.

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Section: Lifetime Increase -Stage IIImentioning

confidence: 57%

Section: A Comparison With the Literaturementioning

confidence: 99%

Section: Final Lifetime Decrease -Stage IVmentioning

confidence: 99%

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Kinetics of natural aging in Al-Mg-Si alloys studied by positron annihilation lifetime spectroscopy

et al. 2011

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“…The cluster formation process during natural aging in the Al-Zn-Mg alloys has been evaluated by PALS 22,23) . Dupasquier et al analyzed the natural aging process of the Al-4.8 mass%Zn-1.26 mass%Mg alloy by positron lifetime and coincidence Doppler broadening (CDB) method and reported that the mean positron lifetime of this alloy after solution treatment and quenching was longer than the positron lifetime in the defect-free lattice in pure aluminum, decreased gradually during natural aging and remained constant 22) . These changes were considered to be attributed to the formation of G.P.…”

Section: Discussionmentioning

confidence: 99%

“…Electrical 15) was performed by a positron lifetime spectrometer composed of fast-fast timing coincidence system with time resolution (FWHM) of 200 ps. A source of 22 NaCl deposited on a thin Kapton foil was sandwiched between two identical specimens. The lifetime spectra, where the total number of counts was about 10 6 , were taken at room temperature for about 5.4 ks.…”

Section: Methodsmentioning

confidence: 99%

Effects of Precipitation State on Serrated Flow in Al-Mg(-Zn) Alloys

et al. 2016

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The effects of the aging conditions on the serrated ow in Al-Mg(-Zn) alloys were investigated, focusing on the precipitation states. Al6%Mg and Al-6%Mg-3%Zn alloys were naturally and arti cially aged after solution treated and quenched. The serrated ow was examined by tensile test. As for the Al-6%Mg-3%Zn alloy, the naturally aged specimens show the increase in the critical strain for serrated ow. The Zn-Mg clusters are formed during natural aging. Furthermore, the increase in the number density and the size of these clusters corresponds to the increases in the critical strain, which reveals that the formation of these coherent clusters is one of the dominant factors for delaying the onset of serrated ow. On the other hand, as for the arti cially aged specimens in the under-aged conditions, the transformation of the clusters to the incoherent meta-stable precipitates brings about the decrease in the critical strain. Furthermore, the increase in the volume fraction of these precipitates in the over-aged conditions reduce the stress amplitude of serrated ow, which are brought about by the decrease in the solute Mg content.

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Natural Aging in Al‐Mg‐Si Alloys – A Process of Unexpected Complexity

et al. 2010

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The natural aging behavior of pure ternary Al‐Mg‐Si alloys is investigated by measuring hardness, electrical resistivity and positron lifetime, as well as carrying out thermal analysis and atom probe microscopy. It is found that several distinct temporal stages of natural aging can be distinguished in which one of these quantities shows a characteristic behavior and that these times coincide for many of these measurements. The rate of change in the measured data is correlated with proposed solute dynamics during natural aging for both aging that takes place prior to artificial aging (natural pre‐aging) and after artificial underaging (natural secondary aging) heat treatments. Controlling factors for solute dynamics are discussed.

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Hardening nanostructures in an AlZnMg alloy

Cited by 48 publications

References 17 publications

Kinetics of natural aging in Al-Mg-Si alloys studied by positron annihilation lifetime spectroscopy

Kinetics of natural aging in Al-Mg-Si alloys studied by positron annihilation lifetime spectroscopy

Effects of Precipitation State on Serrated Flow in Al-Mg(-Zn) Alloys

Natural Aging in Al‐Mg‐Si Alloys – A Process of Unexpected Complexity

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