The RIKEN-RAL pulsed Muon Facility

Matsuzaki, Takashi; Ishida, K.; Nagamine, K.; Watanabe, Isao; Eaton, G.H.; Williams, W.G.

doi:10.1016/s0168-9002(01)00694-5

Cited by 116 publications

(54 citation statements)

References 10 publications

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“…24 Its pulsed muon beamline provides a high intensity which gives about 1 million positron counts per minute. The samples used were of pure aluminium (99.99%) and three different ultra-pure Al-Mg-Si alloys.…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2012

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Muon spin methods are very sensitive to nanoscale defects such as trace elements and vacancies in metals. This sensitivity is required when investigating Al-Mg-Si alloys, a complicated system in which diffusion-controlled phase transformations are responsible for the most important hardening mechanisms. We present muon spin relaxation experiments conducted on Al-Mg-Si alloys at measurement temperatures in the range 20-300 K. Varying the alloy composition and heat treatment, we find differences in muon depolarization in several temperature regimes. This reflects differences in concentration of several types of muon-trapping defects. We identify free solute atom and vacancy regimes, and confirm that the concentration of these defects decrease when an alloy is annealed at low temperature. We further attribute one regime to Mg-Si-vacancy clustering, a mechanism required for precipitation hardening during aging. After storage at room temperature, muon trapping in this regime is more pronounced for a Mg-rich alloy than a Mg-Si-balanced alloy.

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Section: Methodsmentioning

confidence: 99%

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

et al. 2012

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“…The µSR experiment was carried out at the RIKEN-RAL Muon Facility in Rutherford-Appleton laboratory [16]. The pulsed positive muon beams were produced via the decay of positive pions which were yielded from the nuclear reactions of high-energy protons with a carbon target in the ISIS synchrotron accelerator.…”

Section: Methodsmentioning

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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“…25 The LF was applied along the initial muon polarization. The asymmetry parameter at a time t, A(t), is given by A(t) = (F(t) -αB(t))/(F(t) + αB(t)), where F(t) and B(t) are total muon events of the forward and backward counters aligned in the beam line, respectively.…”

Section: Methodsmentioning

confidence: 99%

Development of Spatial Inhomogeneity of Internal Magnetic Field Above T_c in Bi₂Sr₂Ca₁₋_xY_xCu₂O_8+δ Observed by Longitudinal-Field Muon Spin Relaxation

et al. 2014

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Longitudinal-field muon-spin-relaxation measurements have revealed inhomogeneous distribution of the internal magnetic field at temperatures above the bulk superconducting (SC) transition temperature, T c , in slightly overdoped Bi 2 Sr 2 Ca 1−x Y x Cu 2 O 8+δ . The distribution width of the internal magnetic field, ∆, evolves continuously with decreasing temperature toward T c . The origin of the increase in ∆ is discussed in terms of the creation of SC domains in a sample.

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The RIKEN-RAL pulsed Muon Facility

Cited by 116 publications

References 10 publications

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

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

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

Development of Spatial Inhomogeneity of Internal Magnetic Field Above T_c in Bi₂Sr₂Ca₁₋_xY_xCu₂O_8+δ Observed by Longitudinal-Field Muon Spin Relaxation

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The RIKEN-RAL pulsed Muon Facility

Cited by 116 publications

References 10 publications

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

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

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

Development of Spatial Inhomogeneity of Internal Magnetic Field Above Tc in Bi2Sr2Ca1−xYxCu2O8+δ Observed by Longitudinal-Field Muon Spin Relaxation

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Development of Spatial Inhomogeneity of Internal Magnetic Field Above T_c in Bi₂Sr₂Ca₁₋_xY_xCu₂O_8+δ Observed by Longitudinal-Field Muon Spin Relaxation