Probing defects in Al-Mg-Si alloys using muon spin relaxation

Wenner, Sigurd; Holmestad, Randi; Matsuda, Kenji; Nishimura, K.; Matsuzaki, Takashi; Tomono, D.; Pratt, F. L.; Marioara, Calin Daniel

doi:10.1103/physrevb.86.104201

Cited by 23 publications

(25 citation statements)

References 32 publications

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“…Proc. , 011030 (2018)Carlo simulation, in which four variable parameters were employed: the dipolar width , trapping rate  t , detrapping rate  d , and the fraction of initially trapped muons P 0 , following our previous procedure [7]. This method has been introduced in the literature [13,14].…”

Section: Resultsmentioning

confidence: 99%

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Muon Spin Relaxation of an Al–3.4%Zn–1.9%Mg alloy

Nishimura

Matsuda

Nunomura

et al. 2018

Proceedings of the 14th International Conference on Muon Spin Rotation, Relaxation and Resonance (ΜSR2017)

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Zero-field muon spin relaxation measurements were carried out on an Al-3.4% Zn-1.9% Mg alloy in the temperature range from 10 to 300 K. A sample heat treatment clearly made an effect on the relaxation rates of Al-3.4% Zn-1.9% Mg alloys; the dipole width and trapping rate of the heat-treated sample were smaller than those of the non-treated sample below 140 K. The temperature dependence of the trapping and detrapping rates was used to estimate activation energies of muons in Al-3.4% Zn-1.9% Mg.

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Section: Resultsmentioning

confidence: 99%

“…Recently, we have successfully studied heat treatment effects on the Mg/Si/vacancy clusters in Al-Mg-Si (6000 series) alloys by the zero-field muon spin relaxation spectroscopy [7][8][9][10]. Al-Mg-Si alloys are known to be quite sensitive to the aging process, including natural aging (stored at room temperature).…”

Section: Introductionmentioning

confidence: 99%

Muon Spin Relaxation of an Al–3.4%Zn–1.9%Mg alloy

Nishimura

Matsuda

Nunomura

et al. 2018

Proceedings of the 14th International Conference on Muon Spin Rotation, Relaxation and Resonance (ΜSR2017)

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“…The observed muon spin relaxation functions give us rich information on muon hopping between defects in Al alloys. Our recent work with Al-Mg-Si, Al-0.5%Mg, and Al-0.5%Si alloys has demonstrated that the muon trapping rates depended on the heat treatment and solute concentrations: 1) the concentration of dissolved Mg dominates the ν t values at lower temperatures, 2) the ν t values around 200 K reflect a number of clusters and vacancies, 3) a natural aging (alloys are stored at room temperature) effect is clearly observed with Al-0.5%Si [12][13][14][15]. This contribution will review recent experimental results of muon spin relaxation versus temperature.…”

Section: Introductionmentioning

confidence: 99%

Solute-Vacancy Clustering In Al-Mg-Si Alloys Studied By Muon Spin Relaxation Technique

Nishimura¹,

Matsuda²,

Komaki³

et al. 2015

Archives of Metallurgy and Materials

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Zero-field muon spin relaxation experiments were carried out with Al-1.6%Mg 2 Si, Al-0.5%Mg, and Al-0.5%Si alloys. Observed relaxation spectra were compared with the calculated relaxation functions based on the Monte Carlo simulation to extract the dipolar width (∆), trapping (ν t ), and detrapping rates (ν d ), with the initially trapped muon fraction (P 0 ). The fitting analysis has elucidated that the muon trapping rates depended on the heat treatment and solute concentrations. The dissolved Mg in Al dominated the ν t at lower temperatures below 120 K, therefore the similar temperature variations of ν t were observed with the samples mixed with Mg. The ν t around 200 K remarkably reflected the heat treatment effect on the samples, and the largest ν t value was found with the sample annealed at 100 • C among Al-1.6%Mg 2 Si alloys. The as-quenched Al-0.5%Si sample showed significant ν t values between 80 and 280 K relating with Si-vacancy clusters, but such clusters disappeared with the natural aged Al-0.5%Si sample.Keywords: Al-Mg-Si alloys, muon spin relaxation, vacancy Stopy Al-1,6%Mg 2 Si, Al-0,5%Mg i Al-0,5%S poddano badaniu relaksacji spinowej mionów w zerowym polu magnetycznym. Obserwowane widma relaksacyjne porównano z funkcjami relaksacji obliczonymi przy wykorzystaniu symulacji Monte Carlo w celu otrzymania informacji o szerokości dipolarnej ∆ (ang. dipolar width) oraz szybkości uwięzienia ν t (ang. trapping) i uwolnienia ν d (ang. detrapping) z pierwotnie związaną frakcją mionów (P 0 ). Z przeprowadzonej analizy wynika, że szybkość uwięzienia mionów zależy od zastosowanej uprzednio obróbki cieplnej oraz stężenia pierwiastków domieszki. W przypadku Mg rozpuszczonego w osnowie Al dominowała szybkość ν t w temperaturach poniżej 120 K, dlatego też w próbkach domieszkowanych Mg obserwowano podobne odchylenia temperaturowe szybkości ν t . Szybkość ν t w temperaturze około 200 K doskonale ukazuje wpływ zastosowanej obróbki cieplnej na omawiane próbki, z których najwyższą wartość ν t wykazały te wyżarzane w 100 • C spośród stopów Al-1,6%Mg 2 Si. Próbka Al-0,5%Si wykazała znaczące wartości ν t pomiędzy temperaturami 80 a 280 K wskazujące na aglomeracje wakancji Si, które jednak zanikają po naturalnym starzeniu stopu Al-0.5%Si.

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“…[37] Timedependent magnetization [92] and muon measurements have also been used recently. [93,94] 4. Direct Characterization of Clusters À Atom Probe Tomography…”

Section: Other Techniquesmentioning

confidence: 99%

Clustering in Age‐Hardenable Aluminum Alloys

et al. 2018

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This review gives an overview of the effects of clusters in various aluminum alloys. Characterization methods are discussed in general and results for the important AlMgSi alloys are presented in detail. Indirect characterization methods, such as hardness, tensile testing, electrical resistivity, differential scanning calorimetry, and positron annihilation spectroscopy are discussed, as well as atom probe tomography for the direct measurement of clusters. A particular focus is set on atom probe tomography, where possible artifacts influencing the cluster measurements as well as different cluster finding methods are summed up. A comprehensive summary of investigated alloys and cluster algorithm parameters is given. Moreover, the findings in AlMgSi alloys regarding clusters and changes upon different heat treatments are discussed, starting from early to the latest works. Drawn conclusions are discussed and compared to give a r esum e.

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Probing defects in Al-Mg-Si alloys using muon spin relaxation

Cited by 23 publications

References 32 publications

Muon Spin Relaxation of an Al–3.4%Zn–1.9%Mg alloy

Muon Spin Relaxation of an Al–3.4%Zn–1.9%Mg alloy

Solute-Vacancy Clustering In Al-Mg-Si Alloys Studied By Muon Spin Relaxation Technique

Clustering in Age‐Hardenable Aluminum Alloys

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