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Effect of annealing temperature on the structure and mechanical properties of mechanically alloyed AlMg–Nb 2 O 5 and AlMg–ZrSi 2 composites
Author(s) -
KULA A.,
BLAZ L.,
KANEKO J.,
SUGAMATA M.
Publication year - 2010
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2009.03277.x
Subject(s) - materials science , silicide , intermetallic , annealing (glass) , niobium , composite material , composite number , strain rate , zirconium , extrusion , atmospheric temperature range , deformation (meteorology) , oxide , metallurgy , alloy , physics , layer (electronics) , meteorology
Summary Mechanical alloying and hot extrusion method were used for manufacturing AlMg‐based composites reinforced with addition of niobium oxide (Nb 2 O 5 ) and zirconium silicide (ZrSi 2 ) particles. High mechanical properties of the materials were found to result from heavily refined structure of composites. It was found that the composite structure was transformed at high temperature as a result of irreversible chemical reaction between disperse reinforcements and surrounding matrix. Chemical reaction for AlMg–Nb 2 O 5 composite results in a growth of intermetallic grains of Al 3 Nb type and very fine oxides particles of 5–20 nm in diameter. In the annealed AlMg–ZrSi 2 composite, new grains of Al 3 Zr, Mg 2 Si and Al(Mg)O are formed as a result of zirconium silicide decomposition. Hot compression tests were performed at constant true strain rate of 5.10 −3 s −1 within the temperature range of 293–823 K. The high flow stress values are attributed to highly refined structure of the materials that essentially did not coarsen in spite of high deformation temperature.