Details

Autor(en) / Beteiligte

• Vl ek, M
• í ek, J
• Luká, F
• Melikhova, O
• Hruška, P
• Procházka, I
• Vlach, M
• Stulíková, I
• Smola, B
• Jäger, A

Titel

Effects in Mg-Zn-based alloys strengthened by quasicrystalline phase

Ist Teil von

• Journal of physics. Conference series, 2016-01, Vol.674 (1), p.12005

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2016

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Magnesium Mg-based alloys are promising lightweight structural materials for automotive, aerospace and biomedical applications. Recently Mg-Zn-Y system attracted a great attention due to a stable icosahedral phase (I-phase) with quasicrystalline structure which is formed in these alloys. Positron lifetime spectroscopy and in situ synchrotron X-ray diffraction were used to study thermal stability of I-phase and precipitation effects in Mg-Zn-Y and Mg- Zn-Al alloys. All alloys containing quasicrystalline I-phase exhibit misfit defects characterized by positron lifetime of ∼ 300 ps. These defects are associated with the interfaces between I- phase particles and Mg matrix. The quasicrystalline I-phase particles were found to be stable up to temperatures as high as ∼ 370°C. The W-phase is more stable and melts at ∼ 420°C. Concentration of defects associated with I-phase decreases after annealing at temperatures above ∼ 300°C.