Study of structural relaxation in metallic glasses by modulus measurements

Bothe, Klaus; Neuhäuser, H.

doi:10.1016/0036-9748(82)90455-0

Cited by 34 publications

(12 citation statements)

References 16 publications

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“…Within one metabasin the local structural excitations (strings or chains) seem to be mainly reversible as ultrasonic measurements of the shear moduli showed recently [13]. This is known for creep experiments at low temperatures for a long time [14], which by the way demonstrates the shape memory aspects of amorphous metals. Here we systematically analyze the damping behavior of the metallic glass PdCuSi below T g as a function of stress and temperature and give a first temperature-stress relationship for the secondary relaxation mode.…”

Section: Introductionmentioning

confidence: 87%

Influence of stress and temperature on damping behavior of amorphous Pd77.5Cu6.0Si16.5 below Tg

2011

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Abstract. In this work we analyzed the mechanical damping behavior of amorphous Pd 77.5Cu6.0Si16.5 below the glass transition temperature (T g ) with creep/recovery measurements. Here a correlation between temperature stimulation and external stress is found in an exponential, multiplicative way. This demonstrates that not only is the yield stress of the material influenced by temperature variation (mechanical melting) but also the secondary relaxation is modified under stress and temperature.

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Section: Introductionmentioning

confidence: 87%

Influence of stress and temperature on damping behavior of amorphous Pd77.5Cu6.0Si16.5 below Tg

2011

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“…This is done by imaging the shadow of the specimen on a photodiode with a magnification of 24, cf. Bothe and Neuhauser [6]. The amplitude of vibration is in the order of some pm.…”

Section: Experimental Methodsmentioning

confidence: 98%

Combined Measurements of Length and Modulus Change and Calculation of Effective Pair Potentials for the Amorphous Alloy Cu₆₄Ti₃₆

Porscha

Neuhäuser

1994

Physica Status Solidi (b)

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Simultaneous measurements of the length change and of the change of the eigenfrequency at the same specimen are performed for the metallic glass Cu,,Ti,,. The length change is preferably connected with a long-range topological relaxation, while the change of the eigenfrequency preferably gives information on the change of the chemical short-range order. The correlation between the relaxation effects of the two quantities shows a certain change of slope at a characteristic annealing temperature indicating a transition from preferably chemical to topological rearrangements. Assuming a LennardJones type potential the powers of the effective pair potential can be calculated from the temperature dependence of the measured quantities. It is also possible to get information on the variation of the powers due to the structural relaxation effect.An Proben des metallischen Glases Cu,,Ti,, werden exemplarisch Messungen der Langen-und der Frequenzanderung an derselben Probe vorgestellt. Die Langenanderung stellt dabei eine Reaktion vorzugsweise auf die topologische Umordnung in der Probe dar, wahrend die Messung der Frequenzanderung starker auf die chemische Umordnung in der Probe reagiert. Die aus den reinen Relaxationseffekten bestimmte Korrelation der beiden MeRgroBen zeigt eine Anderung in der Steigung bei einer charakteristischen Temperatur fur einen Ubergang von uberwiegend chemischen zu topologisch bestimmten Umordnungen. Bei einem Ansatz der effektiven Paarpotentiale als Lennard-JonesPotentiale lassen sich aus den thermischen Abhangigkeiten die Potentialparameter bestimmen. Die gemessenen Relaxationseffekte erlauben Aussagen iiber die Veranderung der Potentialparameter durch die Strukturrelaxation.

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“…7 that the change of the measured G, E, and V c (t) of the BMG varies roughly linearly with the ln(t) and an approximate relation ⌬Y/Y 0 ϱ ln(t), where is the attempt frequency, to be obeyed in the isothermal annealing; this corresponds to a continuous spectrum of activation energies for the relaxation in the BMG. [17][18][19][20] Our experimental results indicate that the ZrTiCuNiBe BMG has following characteristics: (i) It has a wide supercooled liquid region with sluggish kinetics resulting in strong resistance against crystallization. The diffusion limited growth and high nucleation rate in the supercooled liquid region lead to nanocrystallization.…”

Section: Methodsmentioning

confidence: 99%

Stability of ZrTiCuNiBe Bulk Metallic Glass upon Isothermal Annealing Near the Glass Transition Temperature

Wang

Yang

et al. 2002

J. Mater. Res.

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The stability of Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 bulk metallic glass (BMG) upon isothermal annealing near the glass transition temperature has been investigated by using x-ray diffraction, differential scanning calorimetry, and the pulse echo overlap method. The density, elastic constants, and thermodynamic parameters as well as their annealing time dependence have been determined. The microstructural and properties changes of the annealed BMG were checked by acoustic measurement. Obvious structural and property changes were observed with prolonged annealing of the BMG near the glass transition temperature.

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Study of structural relaxation in metallic glasses by modulus measurements

Cited by 34 publications

References 16 publications

Influence of stress and temperature on damping behavior of amorphous Pd77.5Cu6.0Si16.5 below Tg

Influence of stress and temperature on damping behavior of amorphous Pd77.5Cu6.0Si16.5 below Tg

Combined Measurements of Length and Modulus Change and Calculation of Effective Pair Potentials for the Amorphous Alloy Cu₆₄Ti₃₆

Stability of ZrTiCuNiBe Bulk Metallic Glass upon Isothermal Annealing Near the Glass Transition Temperature

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Study of structural relaxation in metallic glasses by modulus measurements

Cited by 34 publications

References 16 publications

Influence of stress and temperature on damping behavior of amorphous Pd77.5Cu6.0Si16.5 below Tg

Influence of stress and temperature on damping behavior of amorphous Pd77.5Cu6.0Si16.5 below Tg

Combined Measurements of Length and Modulus Change and Calculation of Effective Pair Potentials for the Amorphous Alloy Cu64Ti36

Stability of ZrTiCuNiBe Bulk Metallic Glass upon Isothermal Annealing Near the Glass Transition Temperature

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Combined Measurements of Length and Modulus Change and Calculation of Effective Pair Potentials for the Amorphous Alloy Cu₆₄Ti₃₆