Creep-induced structural changes in Ni-Si-B amorphous alloy
The influence of the stress annealing on the reversible structural relaxation of a Ni-Si-B amorphous ribbon was studied. Creep-induced structural changes in the amorphous structure were derived from anisothermal DSC and dilatometric experiments. It is demonstrated that considerable enthalpy and spec...
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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: | Creep-induced structural changes in Ni-Si-B amorphous alloy / A. Jurikova, J. Miskuf, K. Csach, V. Ocelik // Проблемы прочности. — 2008. — № 1. — С. 24-27. — Бібліогр.: 11 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859620305142546432 |
|---|---|
| author | Jurikova, A. Miskuf, J. Csach, K. Ocelik, V. |
| author_facet | Jurikova, A. Miskuf, J. Csach, K. Ocelik, V. |
| citation_txt | Creep-induced structural changes in Ni-Si-B amorphous alloy / A. Jurikova, J. Miskuf, K. Csach, V. Ocelik // Проблемы прочности. — 2008. — № 1. — С. 24-27. — Бібліогр.: 11 назв. — англ. |
| collection | DSpace DC |
| container_title | Проблемы прочности |
| description | The influence of the stress annealing on the reversible structural relaxation of a Ni-Si-B amorphous ribbon was studied. Creep-induced structural changes in the amorphous structure were derived from anisothermal DSC and dilatometric experiments. It is demonstrated that considerable enthalpy and specimen length variations associated with the reversible structural relaxation are observed after previous creep at higher temperatures.
Исследовано влияние отжига под напряжением на обратимую структурную релаксацию полоски аморфного сплава Ni-Si-B. Изменения аморфной структуры, вызванные ползучестью, исследовались экспериментально с использованием дифференциальной сканирующей калориметрии в неизотермических условиях и дилатометрии. Показано, что значительные изменения энтальпии и длины, связанные с обратимой структурной релаксацией, наблюдаются после предварительной ползучести при повышенной температуре.
|
| first_indexed | 2025-11-29T02:44:48Z |
| format | Article |
| fulltext |
UDC 539. 4
C r e e p -I n d u c e d S tr u c t u r a l C h a n g e s in N i - S i - B A m o r p h o u s A llo y
A . Ju r ik o v a ,1a J . M isk u f,1b K . C sa ch ,1c and V . O celik 2,d
1 Institute o f Experimental Physics, Slovak Academy o f Sciences, K osice, Slovakia
2 Department of Applied Physics, Materials Science Centre and Netherlands Institute o f Metals
Research, University o f Groningen, Groningen, The Netherlands
a akasard@saske.sk, b miskuf@saske.sk, c csach@saske.sk, d v.ocelik@rug.nl
The influence o f the stress annealing on the reversible structural relaxation o f a N i-Si-B
amorphous ribbon was studied. Creep-induced structural changes in the amorphous structure were
derived from anisothermal DSC and dilatometric experiments. It is demonstrated that considerable
enthalpy and specimen length variations associated with the reversible structural relaxation are
observed after previous creep at higher temperatures.
K eyw o rd s : structural relaxation, inelastic strain, N i-based amorphous alloys.
In troduction . M etallic g lasses represent a class o f m etallic materials w ith unique
physical and m echanical properties. From a therm odynam ic point o f v iew they are
unstable and annealing them at elevated temperatures leads to structural relaxation. M any
papers dedicated to structural changes, w hich m anifest them selves through changes in
various physical properties, have been published up to n ow [1 -4 ]. T hey show that besides
irreversible structural relaxation accom panied by annealing-out and quenching-in effects
below the glass transition temperature, there are reversible structural changes brought
about by thermal, m agnetic, or m echanical effects. A tom ic disorder and defects o f various
levels also play an important role in m agnetic properties o f m etallic g lasses [5, 6 ].
G lassy alloys w ith a h igh N i content w ere found to exhibit a glass transition before
crystallization. The com bination o f h igh glass-form ing ability and good m echanical and
soft m agnetic properties o f the N i-b a sed glassy alloys indicates their perspective
applications [7]. The hom ogeneous deform ation ability is influenced by the structure o f
amorphous alloys, nam ely by the amount and m obility o f defects. Creep and creep
recovery experim ents can help understanding these phenom ena [8 ]. For this purpose,
creep-induced structural changes in the N i-S i -B amorphous alloy were studied by means
o f differential scanning calorimetry (D SC ) and therm om echanical analysis (TM A)
methods. The aim o f the present w ork is to find out h ow the creep applied at different
temperatures influences the reversible structural relaxation o f the N i-rich amorphous
alloy.
E xp erim en ta l D eta ils. A n amorphous m etallic ribbon o f the nom inal com position
N i77 5Si7 5B 15 (at.%) w ith a thickness o f 18.8 fxm prepared at the Institute o f P hysics o f the
Slovak A cadem y o f Sciences in Bratislava by rapid quenching o f the m elt on a rotating
disc w as used in experim ents. The amorphous structure o f the sam ples w as checked by
X -ray diffraction. The crystallization temperature o f the amorphous ribbon determ ined by
differential scanning calorim etry for an as-quenched sam ple at the temperature o f the first
crystallization peak onset w as Tx = 492°C.
The specim ens o f 5 m m w idth w ere cut from as-received ribbon and in itially heated
up to a preannealing temperature o f 380oC and kept for 30 m in to elim inate further
irreversible structural relaxation processes. A fter cooling dow n, they were annealed at
temperatures o f 300, 325, and 350oC for about 18 hours under an external tensile stress o f
28 2 MPa. A fter finishing the stress-annealing, the sam ples w ere coo led dow n to room
temperature and then unloaded. Som e preannealed sam ples w ere not subjected to loading
and were used as reference specim ens. Heat treatments w ere perform ed in a tube furnace
© A. JU R IK O V A , J. MISKUF, K. CSACH, V. OCELIK, 2008
24 ISSN 0556-171X. Проблемы прочности, 2008, № 1
mailto:akasard@saske.sk
mailto:miskuf@saske.sk
mailto:csach@saske.sk
mailto:v.ocelik@rug.nl
Creep-Induced Structural Changes in N i-S i-B Amorphous Alloy
in nitrogen atmosphere. D SC m easurem ents were carried out using a Perkin Elmer D SC 7
differential scanning calorimeter. The enthalpy changes were measured under linear
heating w ith a constant heating rate o f 20°C/m in for both the stress-annealed and the
reference samples.
A n additional type o f experim ent w as carried out by m eans o f a Setaram T M A 92
therm om echanical analyzer in the tension arrangement w ith an absolute resolution o f 10
nm and temperature stability better than 0.2°C. A flow o f pure nitrogen w as used to
protect a sam ple. The sam e sam ple w ith an initial length o f 15 m m underwent several
thermal treatments. The initial structure w as stabilized by tw o subsequent heatings to the
temperature 400°C that lies below the glass transition temperature o f this amorphous
material. Such a therm ally treated sam ple w as considered as a reference one. A fter creep
annealing and cooling dow n to room temperature, the length changes under linear heating
w ith a rate o f 10°C/min w ere recorded. Creep annealing w as perform ed at temperatures o f
195, 345, and 370°C for 18 hours under the applied m echanical stress 100 MPa.
R esu lts and D iscu ssion . Typical D SC traces recorded for sam ples annealed for a
long tim e under the applied stress and w ithout it at a temperature o f 325°C are show n in
Fig. 1. The insert show s a D SC thermogram for the w hole m easured temperature range.
The arrows marked Tg and Tx indicate the glass transition and crystallization onset
temperatures, respectively. O nly the part o f the D SC thermogram in the temperature range
up to the g lass transition temperature w as taken into account.
100 150 200 250 300 350 400 450
Temperature [°C]
Fig. 1. DSC traces recorded for the samples annealed at 325°C under and without stress. The insert
shows a DSC thermogram for the whole measured temperature range.
The D SC traces obtained for sam ples subjected to stress annealing and for the
load-free annealed sam ples (reference ones) have a similar shape. This trend w as observed
for all the stress annealing temperatures. The D SC scans recorded for the stress-annealed
sam ples were alw ays found to lie b elow those for the reference sam ples. This m eans that
the structure o f the sam ples subjected to loading is more packed according to the
directional structural relaxation m odel [9 ] that estim ates the influence o f the m echanical
stress on the structural relaxation o f the sam ples. The extent o f this phenom enon increases
w ith increasing annealing temperature.
Figure 2 show s the differences o f m easured D SC data betw een the sam ples annealed
at indicated temperatures under and w ithout stress. It can be seen that the difference is the
larger, the higher the stress annealing temperature. H ow ever, the stress annealing at higher
temperatures leads above all to a dramatic increase in the relative amount o f low er
ISSN 0556-171X. npoôëeubi npounocmu, 2008, № 1 25
A. Jurikovâ, J. Miskuf, K. Csach, and V. Ocelik
activation energy processes. D efects w ith a low er activation energy are especially
responsible for reversible structural relaxation [ 10 , 11].
To estim ate the influence o f creep conditions on the structure relaxation processes,
som e additional therm om echanical experim ents were carried out. A sam ple w as subjected
to annealing at different temperatures under an applied load o f 100 M Pa for about 18 hours.
T his resulted in the total strains derived from dilatom etric experim ents as sum m arized in
Table 1.
T a b l e 1
Total Creep-Induced and Recovered Strains Derived from Dilatometric Experiments
Creep temperature
PC]
Creep strain Recovered strain
[%][ j“m] [%]
195 4.67 0.03 0.02
345 56.75 0.38 0.10
370 108.15 0.72 0.08
0.6
_Q " | _______^ | ' | 1 | 1 ) -1 | ' | ' |
100 150 200 250 300 350 400 450
Temperature [°CI
Fig. 2. The difference between the DSC traces recorded for the samples annealed at indicated
temperatures under and without stress.
The higher temperature o f creep annealing w as applied, the higher total deform ation
w as observed. M axim um permanent strain o f 0.72% w as introduced during creep
annealing at a temperature o f 370°C.
A fter the creep annealing, thermal expansion curves were m easured during linear
heating. The thermal expansion w as accom panied by relative contraction due to creep
recovery processes. N early periodic alternations on dilatometric curves were caused by
sm all non-linearity o f the heating rate due to the temperature controller setting. The creep
recovery contributions to the length changes under linear heating w ere estim ated by
subtracting the elongation curve values o f the reference sam ple from those obtained after
creep annealing at chosen temperatures.
Figure 3 show s the temperature dependence o f creep recovery contributions to the
length changes under linear heating after creep annealing realized at indicated temperatures.
A t higher temperatures, the amount o f the recovered inelastic strain increases up to the
m axim um value o f 0 .1% in the case o f annealing deform ation defects introduced during
creep applied at a temperature o f 345°C (Table 1). Subsequent increasing o f the creep
26 ISSN 0556-171X. npoôëeMbi npounocmu, 2008, N 1
Creep-Induced Structural Changes in N i-S i-B Amorphous Alloy
■1.0-1---- .---- 1---- ,---- 1---- ,---- ,---- ,---- 1---- .---- 1---- ,---- 1
100 150 200 250 300 350 400
Temperature [°C]
Fig. 3. The temperature dependence o f the recovered inelastic strain measured after a long-time
creep annealing at indicated temperatures.
annealing temperature has on ly a sm all influence on the measured value o f the total creep
recovery strain . A decreased sensitivity o f the recovered strain value to the creep-induced
one at higher temperatures can be caused by a relatively h igh heating rate used in the
dilatometric experim ents. A t higher heating rates and g iven temperatures, the creep
recovery processes caused by higher activation energy defects cannot be fu lly activated.
C onclusions. A ccum ulation o f the creep strain o f the N i-S i -B amorphous ribbon is
associated w ith structural changes observed as heat flow evolution under linear heating
during the D SC experiment. A n increase in the creep-induced strain leads to a larger
amount o f recovered inelastic strain, but on ly to a certain extent. A t higher temperatures
and higher values o f the creep-induced strain, the relative amount o f the recovered
inelastic strain does not increase.
Acknowledgment. This work was supported by the Slovak Grant Agency for Science -
VEGA.
1. A. Bohonyey, G. Huhn, L. F. Kiss, et al., Mat. Sci. Eng. A, Suppl., Proc. o f the 9th Int. Conf.
on Rapidly Quenched & Metastable Materials (1997), p. 154.
2. K. Russew and F. Sommer, J. Non-Cryst. Solids, 319, 289 (2003).
3. K. P^kala, P. Jaskiewicz, and D. Oleszak, Mat. Sci. Eng. A, Suppl., Proc. o f the 9th Int. Conf.
on Rapidly Quenched & Metastable Materials (1997), p. 121
4. E. Jakubczyk and M. Jakubczyk, Czech. J. Phys., 54, D165 (2004).
5. A. Kalezic-Glisovic, L. Novakovic, A. Maricic, et al., Mat. Sci. Eng. B, 131, 45 (2006).
6 . A. Lovas, K. Ban, J. Kovac, et al., Czech. J. Phys., 54, D89 (2004).
7. B. Shen and A. Inoue, Mater. Trans., 44, No. 7, 1425 (2003).
8 . K. Csach, V. Ocelik, J. Miskuf, et al., IEEE Trans. Magn., 30, No. 2, 496 (1994).
9. V. A. Khonik, Phys. Stat. Sol. (a), 177, 173 (2000).
10. A. Jurikova, K. Csach, J. Miskuf, et al., Centr. Eur. J. Physics, 5, No. 2, 177 (2007).
11. V. Ocelik, K. Csach, A. Kasardova, et al., Mat. Sci. Eng. A, 226-228, 851 (1997).
Received 28. 06. 2007
ISSN 0556-171X. n poôëeu u npouuocmu, 2008, № 1 27
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| id | nasplib_isofts_kiev_ua-123456789-48414 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0556-171X |
| language | English |
| last_indexed | 2025-11-29T02:44:48Z |
| publishDate | 2008 |
| publisher | Інститут проблем міцності ім. Г.С. Писаренко НАН України |
| record_format | dspace |
| spelling | Jurikova, A. Miskuf, J. Csach, K. Ocelik, V. 2013-08-19T12:52:09Z 2013-08-19T12:52:09Z 2008 Creep-induced structural changes in Ni-Si-B amorphous alloy / A. Jurikova, J. Miskuf, K. Csach, V. Ocelik // Проблемы прочности. — 2008. — № 1. — С. 24-27. — Бібліогр.: 11 назв. — англ. 0556-171X https://nasplib.isofts.kiev.ua/handle/123456789/48414 539. 4 The influence of the stress annealing on the reversible structural relaxation of a Ni-Si-B amorphous ribbon was studied. Creep-induced structural changes in the amorphous structure were derived from anisothermal DSC and dilatometric experiments. It is demonstrated that considerable enthalpy and specimen length variations associated with the reversible structural relaxation are observed after previous creep at higher temperatures. Исследовано влияние отжига под напряжением на обратимую структурную релаксацию полоски аморфного сплава Ni-Si-B. Изменения аморфной структуры, вызванные ползучестью, исследовались экспериментально с использованием дифференциальной сканирующей калориметрии в неизотермических условиях и дилатометрии. Показано, что значительные изменения энтальпии и длины, связанные с обратимой структурной релаксацией, наблюдаются после предварительной ползучести при повышенной температуре. 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 Creep-induced structural changes in Ni-Si-B amorphous alloy Структурные изменения вследствие ползучести в аморфном сплаве Ni-Si-B Article published earlier |
| spellingShingle | Creep-induced structural changes in Ni-Si-B amorphous alloy Jurikova, A. Miskuf, J. Csach, K. Ocelik, V. Научно-технический раздел |
| title | Creep-induced structural changes in Ni-Si-B amorphous alloy |
| title_alt | Структурные изменения вследствие ползучести в аморфном сплаве Ni-Si-B |
| title_full | Creep-induced structural changes in Ni-Si-B amorphous alloy |
| title_fullStr | Creep-induced structural changes in Ni-Si-B amorphous alloy |
| title_full_unstemmed | Creep-induced structural changes in Ni-Si-B amorphous alloy |
| title_short | Creep-induced structural changes in Ni-Si-B amorphous alloy |
| title_sort | creep-induced structural changes in ni-si-b amorphous alloy |
| topic | Научно-технический раздел |
| topic_facet | Научно-технический раздел |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/48414 |
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