Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon
The deformation and fracture behavior of Zr50Ti165Cu15Ni185 bulk amorphous metal in the form of a thin ribbon have been determined in tensile test at room temperature. The fracture is localized in a major shear band and the fracture angle between the tensile stress axis and the fracture plane is clo...
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| Опубліковано в: : | Проблемы прочности |
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| Дата: | 2008 |
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Інститут проблем міцності ім. Г.С. Писаренко НАН України
2008
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| Цитувати: | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon / J. Miskuf, K. Csach, A. Jurikova, V. Ocelfk, V. Bengus, E. Tabachnikova // Проблемы прочности. — 2008. — № 1. — С. 28-31. — Бібліогр.: 15 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860050869597241344 |
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| author | Miskuf, J. Csach, K. Jurikova, A. Ocelik, V. Bengus, V. Tabachnikova, E. |
| author_facet | Miskuf, J. Csach, K. Jurikova, A. Ocelik, V. Bengus, V. Tabachnikova, E. |
| citation_txt | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon / J. Miskuf, K. Csach, A. Jurikova, V. Ocelfk, V. Bengus, E. Tabachnikova // Проблемы прочности. — 2008. — № 1. — С. 28-31. — Бібліогр.: 15 назв. — англ. |
| collection | DSpace DC |
| container_title | Проблемы прочности |
| description | The deformation and fracture behavior of Zr50Ti165Cu15Ni185 bulk amorphous metal in the form of a thin ribbon have been determined in tensile test at room temperature. The fracture is localized in a major shear band and the fracture angle between the tensile stress axis and the fracture plane is close to 45°. Fractographic observations have revealed that the fracture surface of the amorphous metallic glass consists mainly of a vein-like pattern morphology We present a scheme of three zones of fracture surface morphology: progressive smooth sliding region (A), dominating vein like pattern (B), and river-like ripples (C).
Исследованы особенности деформирования и разрушения массивного аморфного металла 2г50Т116.5Си15№185 в виде тонкой ленты при испытании на растяжение при комнатной температуре. Разрушение локализуется в главной полосе сдвига, при этом угол разрушения между осью растягивающего напряжения и плоскостью разрушения близок к 45°. Фрактографические исследования показали, что поверхность излома аморфного металлического стекла состоит в основном из жильной морфологии. Приведена схема трех зон морфологии поверхности излома: область последовательного непрерывного скольжения (А), преобладающая жильная структура (В) и “речная” рябь (С).
|
| first_indexed | 2025-12-07T16:59:41Z |
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UDC 539. 4
F a ilu r e o f Z r 50T i16.5C u 15N i18.5 A m o r p h o u s M e ta l l ic R ib b o n
J. M isk u f,1a K . C sach ,1b A . J u r ik o v a ,1c V . O celfk ,2d V . B en gu s ,3 e
and E . T ab ach n ik ova3,f
1 Institute o f Experimental Physics, Slovakia Academy o f Sciences, Kosice, Slovakia
2 Department of Applied Physics, Materials Science Centre and Netherlands Institute o f Metals
Research, University o f Groningen, Groningen, The Netherlands
3 Verkin Institute for Low Temperature Physics & Eng. UAS, Kharkov, Ukraine
a miskuf@saske.sk, b csach@saske.sk, c akasard@saske.sk, d v.ocelik@rug.nl,
e bengus@ilt.kharkov.ua, f tabachnikova@ilt.kharkov.ua
The deformation and fracture behavior o f Zr50Ti165Cu15Ni185 bulk amorphous metal in the form o f a
thin ribbon have been determined in tensile test at room temperature. The fracture is localized in a
major shear band and the fracture angle between the tensile stress axis and the fracture plane is
close to 45°. Fractographic observations have revealed that the fracture surface o f the amorphous
metallic glass consists mainly o f a vein-like pattern morphology We present a scheme o f three
zones o f fracture surface morphology: progressive smooth sliding region (A), dominating vein like
pattern (B), and river-like ripples (C)
K eyw o rd s : fracture, bulk amorphous alloy, vein -like pattern.
In trod uction . Am orphous m etallic alloys in the form o f ribbons w ith thickness less
than 50 fxm are prepared by rapid m elt quenching on a rotating disc [1]. The deform ation
o f m etallic glass is inhom ogeneous in nature at low er temperatures. O w ing to the absence
o f the long-range order, amorphous m etallic alloys exhibit a very h igh y ield stress
resulting in a very large accum ulation o f strain energy [2]. These glasses show very little
plasticity under tensile loading. Recently, several m ulti-com ponent m etallic alloys w ith an
excellent glass form ing ability have been reported. R educed cooling rates are sufficient to
achieve bulk sam ples in the amorphous state (e.g ., rods a few m illim eters in diameter) [3].
We present the fracture surface analysis o f an amorphous ribbon prepared from the
Z r-T i-C u -N i type o f alloy, capable o f achieving amorphous structure at low er cooling
rates.
E xp erim en ta l. Sam ples m ade from a bulk amorphous a lloy w ith the nom inal
com position o f Zr50Ti16.5C u15N i18 5 (at.%) were used in the experim ents. The 300 ,«m thick
and 3 -5 m m w ide amorphous ribbons w ere prepared by rapid m elt quenching on a
spinning m etallic disc. The thickness o f the prepared ribbon substantially exceeds the
m axim um thickness o f ribbons prepared from standard amorphous alloys. The amorphous
structure o f a sam ple w as confirm ed b y X -ray diffraction. Structure properties were
characterized by differential scanning calorimetry (Perkin Elmer D SC 7). Ribbons were
fractured by a tensile test on the m achine w ith the stiffness o f 10 kN /m m , the deform ation_3 _1
rate being 2 . 6 -10 s at 300 K. A scanning electron m icroscope Tesla B S 340 w as used
for fractographic observations.
R esu lts and D iscussion . A w ide temperature region o f undercooled liquid state
above the glass transition temperature Tg (592 K) up to the crystallization temperature
Tx (629 K) is typical for the amorphous a lloy Zr50T i16.5Cu15N i1g.5 as demonstrated by the
D SC thermogram in Fig. 1. The ribbon sam ples w ere loaded under uniaxial tension. The
measured fracture stress w as 1.53 ± 0 .1 5 GPa w hich is similar to that reported in [4, 5].
_3 _1The stress-strain curve for Z ^ T i^ .sC u ^ N i^ .s at a strain rate o f 2 .6 -1 0 s at 300 K
under uniaxial tension is show n in Fig. 1 on the right side. M ultiple serrations were
© J. M ISKUF, K. CSACH, A. JURIKOVA, V. OCELIK, V. BENGUS, E. TABACHNIKOVA, 2008
28 ISSN 0556-171X. Проблемы прочности, 2008, N 1
mailto:miskuf@saske.sk
mailto:csach@saske.sk
mailto:akasard@saske.sk
mailto:v.ocelik@rug.nl
mailto:bengus@ilt.kharkov.ua
mailto:tabachnikova@ilt.kharkov.ua
Failure o f Zr50Ti16.5Cu15Ni18.5 Amorphous M etallic Ribbon
observed prior to failure. The origin o f the serrated flow in m etallic g lasses is still unclear,
it is defin itely related to the formation o f shear bands. The formation o f the individual
shear band is m anifested in a single serration and all o f the w ork done in producing the
shear band is dissipated as heat [6 ].
Fig. 1. DSC trace of Zr50Ti165Cu15N i185 at a heating rate o f 20 K/min (a). Stress-strain curve at
strain rate o f 2 .6 -10_3 s_1 under uniaxial tension at temperature 300 K (b).
The observed m acroscopic plastic deform ation w as just about 0.5%. The fracture is
localized in a major shear band and the fracture angle betw een the tensile stress axis and
the fracture plane is c lose to 45° - the failure in the m axim um shear stress plane. The
reduced free volum e results in the deviation o f the shear banding direction from the
m axim um shear stress [7].
The m ain fracture surface feature observed w as the vein pattern m orphology created
by the process o f m eniscus instability [8 ]. A ridge (vein) on the fracture surface results
from a connection o f tw o adjacent cavities that grow under the action o f external stress.
Such a vein pattern m orphology show s a mirror im age on tw o opposite sides o f the
created fracture surface.
The left side o f the fracture surface presented in Fig. 2a show s a vein free area
form ed during an initial stage o f the local shear at the w heel side o f the ribbon. This area
corresponds to zone A o f the schem e show n on the right side o f Fig. 2. The schem e
sum marizes all typical features observed on the fracture surface o f 300 jum thick
amorphous ribbons w ith a w ide undercooled liquid state region and fractured by ductile
shear failure.
Fig. 2. Fracture surface in the vicinity of a sample edge. An intensive shear near the edge of the
fracture surface (a) and the scheme o f areas with three characteristic morphologies observed on the
fracture surface o f a 300 /im thick amorphous ribbon (b).
ISSN 0556-171X. n poôëeu u npouuocmu, 2008, № 1 29
J. M iskuf K. Csach, A. Jurikovâ, et al.
For standard amorphous m etallic alloys in the form o f ribbons the failure is initiated
m ostly at surfaces and on ly occasionally at extraneous particles or intersections o f shear
bands [9]. O n the fracture surface o f a 300 fxm thick ribbon w e observed the areas w ith
radial veins. These radial veins com e out from the central flat area as Fig. 3a clearly
shows.
Similar m orphology o f radial veins w as observed on Zr59Cu20A l10N igTi3 bulk
amorphous alloy failed in tensile m ode [10]. The fracture nucleates at the central flat part
as a consequence o f tw o processes: (i) the nucleation and (ii) the propagation o f cores. A
subsequent cavity growth proceeds through the form ation o f radial veins w hich becom e
finally linked to the m ain vein around the w hole ce ll - Fig. 3a. The cell contains a flat and
radial parts enclosed w ith secondary vein rings o f a cellular unit. N o extraneous particles
or visib le defects are present at flat centers.
a b
Fig. 3. Cellular vein-like morphology together with areas o f radial primary veins - zone B (a).
“River morphology o f fracture surface” corresponding to zone C o f the scheme in Fig. 2b.
The fractographic analysis o f ductile shear failure o f a 300 /xm thick amorphous
m etallic ribbon has show n that its m orphologic characteristics are close to the features
observed on the ductile fracture surface o f bulk amorphous m etallic materials in a w ide
variety o f forms [9]. The fracture surface is form ed through the m eniscus instability
process inside an adiabatic thin shear band.
A com plex stress field at the final fracture stage forms distinct re lie f structures on
the fracture surface w ith a number o f aligned veins. The re lie f fracture surface contains
ridges w ith the m ain vein at their tops and ditches betw een them - Fig. 3b. A ligned
primary veins propagate from the rivers to the ridges and link into the m ain one. This type
o f the vein organization observed on the fracture surface o f Pd40Cu30N i10P20 bulk
amorphous alloy is called the river m orphology o f fracture surface [11]. Similar fracture
surface m orphology o f Zr-based bulk m etallic glass matrix com posites and C u-based bulk
glass after com pression testing w as observed in [12]. H ow ever, the round cores w ith radial
veins w ere also observed in com pression at elevated temperatures [13].
The tensile failure criterion [14] indicates that tensile failure is controlled by both the
normal stress o and the shear stress r (where o 0 is the normal fracture stress and r 0 is
the shear fracture stress):
2 2o 2 r 2
- 1 (1)
o 0 r 0
H ow ever, the dependence o f the shear stress x on the normal stress o is not linear
as the M ohr-C oulom b criterion. The influence o f the normal stress presence during the
creation o f zones B and C at failure causes the principal difference in the fracture surface
30 ISSN 0556-171X. npoôëeubi npounocmu, 2008, № 1
Failure o f Zr50Ti16.5Cu15Ni185 Amorphous M etallic Ribbon
m orphology betw een zone A and zones B and C. The sm ooth surface o f zone A created
under the pure shear stress at the first stage becom es, due to increasing normal stress,
more multifarious (zone B). The increased influence o f the normal stress in final stages o f
deform ation and failure and more com plex deform ation conditions associated w ith
serration on the loading-deform ation curve leads to higher surface profile w ith ripples
(zone C). Sim ilar distinguishing o f fracture stages in the case o f a polym er failure was
described in [15].
The results suggest that the catastrophic fracture is no longer a pure shear process,
w hereas the normal stress p lays a remarkable role.
C onclusions. The fractographic analysis o f the fracture surface o f Zr50Ti16.5Cu15N i18.5
amorphous m etallic a lloy in the form o f a 300 fxm thick ribbon fractured in tensile tests
reveals the presence o f shear failure by the m eniscus instability m echanism . Features
similar to the fracture m orphology o f bulk amorphous alloys are formed in the catastrophic
shear band and presented on the fracture surface.
We have described three different distinct pattern m orphologies. Primary progressive
sliding in the first region (A ) is fo llow ed by the general fracture that consists o f tw o
regions. The presence o f the vein -like pattern w ith frequent radial ve in forms is typical o f
the second fracture region (B). The last - third - region o f the fracture surface (C) has a
more pronounced re lie f and is covered w ith a river-like pattern. The vein -like pattern o f
the second region covers a dominant part o f the final fracture surface.
Acknowledgment. This work was supported by the Slovak Grant Agency for Science -
VEGA.
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9. V. Z. Bengus, E. D. Tabachnikova, J. Miskuf, et al., J. Mat. Sci., 35, 4449 (2000).
10. Z. F. Zhang, J. Eckert, and L. Schultz, Acta Mater., 51, 1167 (2003).
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(1991).
Received 28. 06. 2007
ISSN 0556-171X. npo6neMbi npouuocmu, 2008, № 1 31
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| id | nasplib_isofts_kiev_ua-123456789-48411 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0556-171X |
| language | English |
| last_indexed | 2025-12-07T16:59:41Z |
| publishDate | 2008 |
| publisher | Інститут проблем міцності ім. Г.С. Писаренко НАН України |
| record_format | dspace |
| spelling | Miskuf, J. Csach, K. Jurikova, A. Ocelik, V. Bengus, V. Tabachnikova, E. 2013-08-19T12:47:12Z 2013-08-19T12:47:12Z 2008 Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon / J. Miskuf, K. Csach, A. Jurikova, V. Ocelfk, V. Bengus, E. Tabachnikova // Проблемы прочности. — 2008. — № 1. — С. 28-31. — Бібліогр.: 15 назв. — англ. 0556-171X https://nasplib.isofts.kiev.ua/handle/123456789/48411 539. 4 The deformation and fracture behavior of Zr50Ti165Cu15Ni185 bulk amorphous metal in the form of a thin ribbon have been determined in tensile test at room temperature. The fracture is localized in a major shear band and the fracture angle between the tensile stress axis and the fracture plane is close to 45°. Fractographic observations have revealed that the fracture surface of the amorphous metallic glass consists mainly of a vein-like pattern morphology We present a scheme of three zones of fracture surface morphology: progressive smooth sliding region (A), dominating vein like pattern (B), and river-like ripples (C). Исследованы особенности деформирования и разрушения массивного аморфного металла 2г50Т116.5Си15№185 в виде тонкой ленты при испытании на растяжение при комнатной температуре. Разрушение локализуется в главной полосе сдвига, при этом угол разрушения между осью растягивающего напряжения и плоскостью разрушения близок к 45°. Фрактографические исследования показали, что поверхность излома аморфного металлического стекла состоит в основном из жильной морфологии. Приведена схема трех зон морфологии поверхности излома: область последовательного непрерывного скольжения (А), преобладающая жильная структура (В) и “речная” рябь (С). This work was supported by the Slovak Grant Agency for Science - VEGA. en Інститут проблем міцності ім. Г.С. Писаренко НАН України Проблемы прочности Научно-технический раздел Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon Разрушение аморфной металлической ленты из Zr5o Tii6.5 Cui5 Nii8.5 Article published earlier |
| spellingShingle | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon Miskuf, J. Csach, K. Jurikova, A. Ocelik, V. Bengus, V. Tabachnikova, E. Научно-технический раздел |
| title | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon |
| title_alt | Разрушение аморфной металлической ленты из Zr5o Tii6.5 Cui5 Nii8.5 |
| title_full | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon |
| title_fullStr | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon |
| title_full_unstemmed | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon |
| title_short | Failure of Zr50 Ti16.5 Cu15 Ni18.5 amorphous metallic ribbon |
| title_sort | failure of zr50 ti16.5 cu15 ni18.5 amorphous metallic ribbon |
| topic | Научно-технический раздел |
| topic_facet | Научно-технический раздел |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/48411 |
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