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Persistent URL http://purl.org/net/epubs/work/66112
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Record Id 66112
Title Muon kinetics in heat treated Al (-Mg)(-Si) alloys
Abstract Al-Mg-Si alloys are heat-treatable and rely on precipitation hardening for their mechanical strength. We have employed the technique of muon spin relaxation to further our understanding of the complex precipitation sequence in this system. The muon trapping kinetics in a material reveals a presence of atom-sized defects, such as solute atoms (Mg and Si) and vacancies. By comparing the muon kinetics in pure Al, Al-Mg, Al-Si and Al-Mg-Si when held at different temperatures, we establish an interpretation of muon trapping peaks based on different types of defects. Al-Mg-Si samples have a unique muon trapping peak at temperatures around 200 K. This peak is highest for samples that have been annealed at 70-150 degrees C, which have microstructures dominated by a high density of clusters/Guinier Preston zones. The muon trapping is explained by the presence in vacancies inside these structures. The vacancies disappear from the material when the clusters transform into more developed precipitates during aging.
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Language English (EN)
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Journal Article Acta Mater 61, no. 16 (2013): 6082-6092. doi:10.1016/j.actamat.2013.06.050 2013