Microstructure, Thermal and Mechanical Properties of Non-Isothermally Annealed Al-Sc-Zr and Al-Mn-Sc-Zr Alloys Prepared by Powder Metallurgy

• Authors: M. Vlach , I. Stulíková , B. Smola , H. Císařová , J. Piešová , S. Daniš , R. Gemma , D. Tanprayoon , V. Neubert
• Languages of publication: EN

Abstracts

EN

This paper reports results of a study aimed at understanding the precipitation processes occurring during the annealing of two Al-Sc-Zr-based alloys with and without Mn prepared by powder metallurgy with subsequent hot extrusion at 350°C. Samples were isochronally annealed up to ≈ 570°C. Precipitation behaviour was studied by electrical resistometry and differential scanning calorimetry. Mechanical properties were monitored by microhardness HV1 measurements. Transmission electron microscopy examinations and X-ray diffraction of specimens quenched from temperatures of significant resistivity changes helped to identify the microstructural processes responsible for these changes. Fine (sub)grain structure develops and fine coherent Al_3Sc and/or Al_3(Sc,Zr) particles precipitate during extrusion in both alloys. The distinct changes in resistivity (at temperatures above ≈ 330°C) of the Al-Mn-Sc-Zr alloy are mainly caused by precipitation of Mn-containing particles. The easier diffusion of Mn atoms along the (sub)grain boundaries is responsible for the precipitation of the Al_6Mn and/or Al_6(Mn,Fe) particles at relatively lower temperatures compared to the temperature range of precipitation of these particles in the classical mould-cast Al-Mn-Sc-Zr alloys The apparent activation energy for precipitation of the Al_3Sc and Al_6Mn particles in the Al-Mn-Sc-Zr alloy was determined as (106 ± 10) kJ mol^{-1} and (152 ± 33) kJ mol^{-1}, respectively.

Keywords

EN

81.20.Ev; 81.30.Mh

Discipline

• 81.20.Ev: Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
• 81.30.Mh: Solid-phase precipitation(for precipitation hardening, see 81.40.Cd)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 3
• Pages: 439-443

Dates

published

2012-09

Contributors

author

M. Vlach

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague, Czech Republic

author

I. Stulíková

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague, Czech Republic

author

B. Smola

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague, Czech Republic

author

H. Císařová

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague, Czech Republic

author

J. Piešová

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague, Czech Republic

author

S. Daniš

• Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague, Czech Republic

author

R. Gemma

• Institute of Material Physics, University of Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany

author

D. Tanprayoon

• Institut für Materialprüfung und Werkstofftechnik, Freiberger Str. 1, D-38678 Clausthal-Zellerfeld, Germany

author

V. Neubert

• Institut für Materialprüfung und Werkstofftechnik, Freiberger Str. 1, D-38678 Clausthal-Zellerfeld, Germany

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Identifiers

DOI

10.12693/APhysPolA.122.439