“1 gain . . .
tess fe Atomic Force Microscopy Study of Ru-Al Eutectic
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Wily N.Ilic, M.Goken*, M. Kempf *, K. Durst’, F.Soldera, N.Manent, F.Miicklich
AAW e
Tag I
a ha Saarland University, Functional Materials Dept., Saarbriicken, Germany
"ICON *) Saarland University, Materials Science Dept., Saarbrücken, Germany
Abstract
nn Young’s modulus of elasticity (E) and nanohardness (NH) of different microstructural features in
RB hie eutectic Ru-Al alloy, were determined by nanoindentions using Atomic Force Microscope (AFM).
a The eutectic alloy was investigated in as-cast and homogenized condition. The microstructure
a! consisted of RuAl primary dendrites and fine lamellar and rod-like eutectic, which coarsened after
deviaton of heat treatment. It is shown that local mechanical properties are affected by heat treatment and phase
oi meth morphology. Surface profiles, clearly illustrate poor ability of -Ru phase to accommodate
vlc ie deformation (formation of piled-up volume was observed), while intermetallic RuAl phase
115 researCr. deformed readily.
Ties regardless
Introduction
Ruthenium forms with aluminum a number of intermetallic compounds, but the equiatomic
compound, RuAl, has attracted the greatest attention. Apart from its good oxidation and corrosion
resistance, good thermal and electrical conductivity and high temperature strength, as compared to
other B2 intermetallics, RuAl also has good room temperature ductility [1-4].
New
Sl 40.0 nm
1 Microscopy. hae
idy of the
a metall. 32 20.0 nm
»rei-Technische
sch‘ —— 40.0 nu
u-Polyorystals a
~ Fig. 1. Indentations in lamelar eutecticum (AFM). Fig. 2. Indentations in rod-like eutecticum (AFM).
|-Pecher;
agnetic Layers
y of Materials
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cr0SCOPY a) = rar wo 2 we bi N c) | ne ap 500
: Fig. 3. a-c. AFM general view of indentations in microstructure (b);
details: pile up volume in a-Ru phase (a), RuAl phase (c).
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