Low-temperature anomalies in Young's modulus and internal friction of Cu–Al–Ni single crystals

Kustov, S.; Golyandin, S.; Sapozhnikov, K.; Humbeeck, Jan Van; Batist, R. De

doi:10.1016/s1359-6454(98)00168-2

Cited by 52 publications

(42 citation statements)

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“…Another conspicuous detail is the absence of the amplitude hysteresis in the stress anmplitude dependence of the IF. This is contrary to what has been observed for the Pi' martensite in Cu-Al-Ni [9,10] and Cu-Al-Be systems [11], and points to the absence of mobile pinning points in the Cu-Al-Ni yi' martensite at a temperature of about 100 K..…”

Section: Resultscontrasting

confidence: 98%

“…Figure 2 shows that the impact loading does not have a pronounced effect on the anelastic properties of the yi' martensite, in contrast to the YM. A high contribution of anelastic strain to the measured YM of the Pi' martensitic phase was detected as an anomaly of its temperature dependence [3][4][5]9]. Figure 1 demonstrates that, in line with the relative stability of the strain amplitude dependence of the IF, the anomaly of the YM temperature dependence is not observed in the as-quenched and impacted y/ martensite.…”

Section: Discussionmentioning

confidence: 91%

“…2. As has been shown, interaction of mobile partial dislocations with atmospheres of quenched-in defects controls to a great extent the anelasticity of the Pi' martensite for the Cu-Al-Ni [3][4][5]9,10,14] and Cu-Al-Be |11] systems. Most likely, quenched-in defects for the present alloy composition are annealed out in the Pi phase at room temperature.…”

Section: Discussionmentioning

confidence: 99%

“…The experimental setup [8] enabled us to measure the strain amplitude dependence (strain amplitude ranged from 2xl0" 7 to 2X10" 4 ) and temperature dependence (for temperatures of 90-300 K) of the IF and YM of the samples. More details of the technique have been published elsewhere [9].…”

Section: Methodsmentioning

confidence: 99%

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Transformation temperatures, elastic and anelastic properties of Cu-Al-Ni crystals subjected to impact loading

et al. 2001

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Experimental investigations of the influence of impact loading on properties of Cu-AI-Ni single crystals have been performed. Crystals in the p\ phase were impacted with pulses of a uniaxial plane strain wave with a duration of about 2X10" 6 s. A normal component of stress in the direction of the pulse propagation ranged from 0.5 to 5.4 GPa. For as-quenched and impacted crystals martensitic transformation temperatures were determined, the Young's modulus (YM), strain amplitudeindependent and strain amplitude-dependent internal friction were measured at a frequency of about 100 kHz over the temperature range of 300-90 K for strain amplitudes of IO" 7 -2xlO" 4 . Experimental results indicate that Pi->Yi' martensitic transformation (MT) and plastic deformation of the martensite are induced by the impact. The impact loading generates a «structure memory effect»: the YM in the austenite is not sensitive to the impact, but the consequent temperature-induced MT reveals a dramatic influence of the impact on the YM of the y,' martensite. The conclusion is drawn that the observed effect is fundamentally similar to the two-way memory effect, but is extremely sensitive to the impact stress. The origin of this phenomenon is attributed to the internal stresses, created by impact, which control the nucleation of preferentially oriented anisotropic martensitic variants during temperature-induced MT in impacted crystals. No influence of the impact loading on the transformation temperatures was detected for pi->Yi' MT, in contrast to elastic properties of the martensitic phase, indicating that structural changes due to the high-velocity impact do not affect appreciably the thermoelastic equilibrium and hysteretic motion of parent -martensite boundaries during the MT.

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Section: Resultscontrasting

confidence: 98%

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Transformation temperatures, elastic and anelastic properties of Cu-Al-Ni crystals subjected to impact loading

et al. 2001

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“…Recently, detailed investigations of variations in defect structure during post-ageing of Cu-Al-Ni alloys have been performed also. Several internal friction techniques showed a significant influence of heat treatment on the amplitude-dependent anelasticity in the b 0 1 martensitic phase [1,2]. Elastic and anelastic properties of Cu-Al-Ni single crystals in the b 0 1 martensitic phase have been studied in the temperature range 7-300 K at a frequency of about 100 kHz.…”

Section: Introductionmentioning

confidence: 99%

Shock Loading Effect on the MHz-Range Amplitude-Independent Internal Friction and Elastic Properties of the ??1 Martensite Phase in Cu-Al-Ni Alloys

Кобелев

Soifer

Golyandin

et al. 2002

phys. stat. sol. (a)

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The internal friction spectrum at 5 MHz in the martensite b 0 1 -phase of CuAlNi alloys shows two prominent internal friction peaks at 270 and 170 K. Corresponding anomalies in the sound wave velocity-temperature dependence have been observed. Detailed analysis of the behaviour of the peaks in dependence on different levels of impact loading and g-irradiation points to dislocationpoint defect interaction. It is assumed that grain boundary dislocations are responsible for the 270 K peak while lattice dislocation, existing within the martensite variants are responsible for the 170 K peak.

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On the Internal Friction Due to the Twin Boundary-H Interaction in Martensite

Fan

Zhou

Otsuka

et al. 2013

Icomat

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The development of high damping materials is important in the modern world, in order to suppress noises and to avoid vibrations in automobiles etc. In such development researchers are paying keen attention to the use of the relaxation type internal friction peak in martensite, because the peak is stable at constant temperature. Such a relaxation type peak was first found in Ti-Nibased alloys in 1960's, and was interpreted in various ways in the past, such as dislocation relaxation, dislocation-point defect relaxation or hydrogen relaxation, etc. Recently we proved by critical experiments in Ti 50 Ni 50-x Cu x alloys that both twin boundaries and hydrogen are indispensable for the appearance of the relaxation peak. In order to check the generality of the result, other shape memory alloys such as Ti-Ni-Fe, Ti-Ni-Pd, Ti-Pd, Mn-Cu, Au-Cd, Cu-Al-Ni etc. were investigated from this viewpoint by using DMA. As a result, the relaxation peak was observed in most of the alloys, except for Cu-Al-Ni alloy. By assessing the previous mechanisms proposed, we will discuss the possible mechanism for the relaxation peak in martensite. Based on these investigations, a guideline for obtaining high damping materials is also suggested.

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Low-temperature anomalies in Young's modulus and internal friction of Cu–Al–Ni single crystals

Cited by 52 publications

References 4 publications

Transformation temperatures, elastic and anelastic properties of Cu-Al-Ni crystals subjected to impact loading

Transformation temperatures, elastic and anelastic properties of Cu-Al-Ni crystals subjected to impact loading

Shock Loading Effect on the MHz-Range Amplitude-Independent Internal Friction and Elastic Properties of the ??1 Martensite Phase in Cu-Al-Ni Alloys

On the Internal Friction Due to the Twin Boundary-H Interaction in Martensite

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