Superplastic deformation of Mg–9Li–2Al–0.5Sc alloy after grain refinement by KoBo extrusion and cyclic forging

• Autorzy: Dutkiewicz Jan , Kalita Damian , Maziarz Wojciech , Faryna Marek

Identyfikatory

DOI

10.1007/s43452-020-00128-9

• Języki publikacji: EN

Abstrakty

EN

The quaternary Mg–9Li–2Al–0.5Sc alloy (in wt%) was prepared from pure components. After homogenization, the alloy was subjected to severe plastic deformation by KoBo extrusion and cyclic forging leading to grain refinement in the range of 0.5–2 µm of hexagonal close-packed (HCP) α phase. Deformed alloys showed high ultimate tensile strength near 200 MPa and good elongation in the range 30–40% at room temperature (RT). Large elongations close to 200% were obtained during the tensile test at a temperature of 200 °C. Deformed samples showed the presence of multiple voids confirming grain boundary sliding mechanism of deformation. Twins on {101-2} planes were identified using electron backscatter diffraction analysis, being in a good agreement with the earlier observation of Mg–Li and Mg–Sc alloys. Intermetallic phases such as cubic MgSc were identified in deformed alloys mostly within HCP α phase, whereas HCP MgSc2 particles were observed within body-centered cubic (BCC) β phase. Intermetallic phases were responsible for RT strengthening of alloys and slightly lower tensile elongation during superplastic deformation. Formation of the HCP α phase was observed within the BCC β phase in tensile deformed alloys. Atomic-level nucleation of HCP phase within the β phase was identified by the use of high-resolution transmission electron microscopy technique.

Słowa kluczowe

EN

magnesium alloys; MgLiAlSc alloys; superplastic deformation; KOBO extrusion; cyclic forging; TEM

PL

stop magnezu; odkształcenie plastyczne; wytłaczanie; kucie

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2020
• Tom: Vol. 20, no. 4
• Strony: 343--353
• Opis fizyczny: Bibliogr. 37 poz., rys., wykr.

Twórcy

autor

Dutkiewicz Jan

• Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25, Reymonta St., 30‑059 Kraków, Poland

autor

Kalita Damian

• Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25, Reymonta St., 30‑059 Kraków, Poland

autor

Maziarz Wojciech

• Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25, Reymonta St., 30‑059 Kraków, Poland

autor

Faryna Marek

• Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 25, Reymonta St., 30‑059 Kraków, Poland

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Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021)