Motion of dislocations and interfaces during deformation of martensitic Cu–Al–Ni crystals

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

doi:10.1016/s1359-6454(99)00374-2

Cited by 36 publications

(18 citation statements)

References 12 publications

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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%

“…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%

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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: 99%

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

et al. 2001

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“…In the as-grown condition and at room temperature, alloy M is in the martensite state whereas alloy A is in the austenite state. Prior to the experiments, samples were homogenized for 60 min at 1223 K and for 15 min at 1173 K for alloys A and M, respectively [3,5,10,13]. The alloy A was quenched in a mixture of ice and water, and the alloy M was quenched into water.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Aging response and its effect on the functional properties of Cu–Al–Ni shape memory alloys

Suresh

Ramamurty

2008

Journal of Alloys and Compounds

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“…IF I is the intrinsic internal friction of the austenitic or martensitic phase, and it depends strongly on microstructural properties such as dislocations, vacancies, and twin boundaries. It has been reported that IF I is also temperature rate dependent, since time-dependent pinning affects the intrinsic damping and depends on the concentration of mobile pinning points throughout the heat treatment procedure during thermal cycling and deformation of Cu-based alloys [9][10][11][12]. The damping capacities of IF PT and IF I are usually more important than that of IF Tr because most high-damping applications of SMAs are realized at a steady temperature.…”

Section: Introductionmentioning

confidence: 99%

Damping Characteristics of Inherent and Intrinsic Internal Friction of Cu-Zn-Al Shape Memory Alloys

Chan

Chang

2017

Metals

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Damping properties of the inherent and intrinsic internal friction peaks (IF PT + IF I ) of 7.5, 8.0, 8.5, and 9.0 wt. %) shape memory alloys (SMAs) were investigated by using dynamic mechanical analysis. The Cu-7.5Zn-11Al, Cu-8.0Zn-11Al, and Cu-8.5Zn-11Al SMAs with (IF PT + IF I ) β 3 (L2 1 )→γ 3 (2H) peaks exhibit higher damping capacity than the Cu-7.0Zn-11Al SMA with a (IF PT + IF I ) β 3 (L2 1 )→γ 3 (2H) peak, because the γ 3 martensite phase possesses a 2H type structure with abundant movable twin boundaries, while the β 3 phase possesses an 18R structure with stacking faults. The Cu-9.0Zn-11Al SMA also possesses a (IF PT + IF I ) β 3 (L2 1 )→γ 3 (2H) peak but exhibits low damping capacity because the formation of γ phase precipitates inhibits martensitic transformation. The Cu-8.0Zn-11Al SMA was found to be a promising candidate for practical high-damping applications because of its high (IF PT + IF I ) peak with tan δ > 0.05 around room temperature.

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Motion of dislocations and interfaces during deformation of martensitic Cu–Al–Ni crystals

Cited by 36 publications

References 12 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

Aging response and its effect on the functional properties of Cu–Al–Ni shape memory alloys

Damping Characteristics of Inherent and Intrinsic Internal Friction of Cu-Zn-Al Shape Memory Alloys

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