Mechanical properties of nanocrystalline films have been found to differ from typical features exhibited in bulk coarse grained materials. To gain insight for the casuses of higher yield and tensile strength and lower ductility measured in these films, experiments allowing direct observations of the deformation mechanisms such as in-situ transmission electron microscopy tensile testing as well as molecular dynamics computer simulations can be employed. A restricted time and size scale of molecular dynamics simulations results in simulations using strain rates several orders higher than strain rates and sample sizes smaller that generally used in real deformation experiments. In-situ tensile experiments of free-standing 50 nm thick nanocrystalline Al films have been realized and results were compared with the molecular dynamic simulation designed to approach the conditions of performed experiment in a reasonable computational time.

1.
F. R.
Brotzen
,
Int. Mater. Rev.
39
(
1
),
24
45
(
1994
).
2.
D. T.
Read
et.al,
J. Mater. Res.
8
(
7
),
1542
1549
(
1993
).
3.
M. D.
Uchic
et.
al
,
Science
305
, (
5686
),
986
989
(
2004
).
4.
M. D.
Uchic
et.
al
,
Annu. Rev. Mater. Res.
39
,
361
386
(
2009
).
5.
E. O.
Hall
,
Proceedings of the Physical Society. Section B
64
(
9
),
747
753
(
1951
).
6.
N. J.
Petch
,
J. Iron Steel Institute
174
,
25
28
(
1953
).
7.
J.
Weertman
and
P.
Sanders
,
Solid State Phenom.
35-36
,
249
262
(
1993
).
8.
S. C
Pun
et.
al
,
Mater. Sci. Eng. A
649
,
400
406
(
2017
).
9.
K. S.
Kumar
et.
al
,
Acta Mater.
51
(
2
),
387
405
(
2003
).
10.
M. D.
Amanu
et.
al
,
J. Mater. Res.
20
(
7
),
1769
1777
(
2005
).
11.
K.
Hattar
et.
al
,
J. Mater. Res.
20
(
7
),
1869
1877
(
2005
).
12.
J.
Diao
et.
al
,
Acta Mater.
54
(
3
),
643
653
(
2006
).
13.
V.
Dupont
and
T. C.
Germann
,
Phys. Review B
86
(
13
),
134111
(
2012
).
14.
D. S.
Ganiola
et.
al
,
J. Appl. Phys.
112
,
124313
(
2012
).
15.
Z. T.
Trautt
and
Y.
Mishin
,
Acta Mater.
60
(
5
),
2407
2424
(
2012
).
16.
P.
Hirel
,
Comput. Phys. Comm.
197
,
212
219
(
2015
).
17.
S.
Plimpton
,
J. Computat. Phys.
117
,
1
19
(
1995
).
18.
A.
Stukowski
,
Mater. Sci. Eng.
18
,
015012
(
2010
).
19.
V.
Yamakov
 et al,
Nat. Mater.
1
, (
1
)
45
46
(
2002
)
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