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Journal Article
Vickers indentation tests on olivine: size effects
2020
Overview
We conducted Vickers indentation tests on Fe-free (Mg
2
SiO
4
) and Fe-bearing (Mg
1.8
Fe
0.2
SiO
4
) olivine single crystals and high-density polycrystalline material with average grain sizes ranging from 170 to 890 nm. The Vickers microhardness (
H
v
) of the Fe-free polycrystalline material with the finest grain size is ~ 17 GPa at a load of 0.1 N, while that of the Fe-bearing single crystal is ~ 8 GPa at the largest load applied. Overall,
H
v
decreases with increasing grain size, load (indentation depth), and the presence of Fe. For each grain size,
H
v
is well characterized by a power law of the form
H
v
/
H
v
0
∝
l
-
x
, where
H
v
0
is the depth-independent value of
H
v
,
l
represents either grain size or indentation depth, and
x
is 0.09. Despite the small exponent value for each size effect, the nonlinear interaction of the two size effects results in large variations of
H
v
in our samples. We show that our semi-empirically derived relationship as a function of grain size and indentation depth explains the
H
v
of both polycrystalline and single-crystal olivine at any indentation conditions. Indentation fracture toughness of the finest-grained material is 0.8
MPa
m
1
/
2
, which increases slightly to 1.1
MPa
m
1
/
2
with increasing grain size, while the toughness of the single crystals varies from 0.5 to 0.8
MPa
m
1
/
2
depending on the crystallographic orientation of the fracture planes.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
