A series of notch tests are conducted using molecular dynamics simulation to study the effects of surface imperfections on deformation and failure behaviors in amorphous metals. It is shown that the surface notches of radius as small as 1 nm could trigger rapid failure; and the notch depth is much more effective than the radius in causing brittleness. The intrinsic ductility and brittleness caused by surface imperfections in amorphous metals under external loading are discussed.
REFERENCES
1.
C. A.
Pampilo
, J. Mater. Sci.
10
, 1194
(1975
).2.
H.
Chen
, Rep. Prog. Phys.
43
, 353
(1980
).3.
4.
5.
Y.
He
, S. J.
Poon
, and G. J.
Shiflet
, J. Appl. Phys.
64
, 6863
(1988
).6.
Glass–Science and Technology
, edited by D. R.
Uhlmann
and N. J.
Kreidl
(Academic
, New York , 1980
), Vol. 11
.7.
M. A.
LaMadrid
, S. D.
O’Conner
, A.
Peker
, W. L.
Johnson
, and J. D.
Bladeschwieler
, J. Mater. Res.
11
, 1494
(1996
).8.
C. J.
Gilbert
, V.
Schroeder
, and R. O.
Ritchie
, Metall. Trans. A
30
, 1739
(1999
).9.
F.
Spaepen
(private communication).10.
11.
C.
Hausleitner
and J.
Hafner
, Phys. Rev. B
45
, 115
(1992
);C.
Hausleitner
and J.
Hafner
, Phys. Rev. B
45
, 128
(1992
).12.
J.
Hafner
and C.
Baker
, J. Phys.: Condens. Matter
8
, 5269
(1996
)13.
S.
Nose
, J. Chem. Phys.
81
, 511
(1984
);14.
M.
Parrinello
and A.
Rahman
, J. Appl. Phys.
52
, 7182
(1981
);M.
Parrinello
and A.
Rahman
, J. Chem. Phys.
76
, 2662
(1982
).15.
16.
17.
Q. K.
Li
and M.
Li
(unpublished).18.
Standard Method of Sharp-Notch Tension Testing with Cylindrical Specimens
, ASTM E602-03.19.
H.
Erying
, J. Chem. Phys.
4
, 283
(1936
).20.
Q. K.
Li
and M.
Li
(unpublished).© 2005 American Institute of Physics.
2005
American Institute of Physics
You do not currently have access to this content.
