Detection of shock-wave-induced internal stresses in Cu-Al-Ni shape memory alloy by means of acoustic technique

Emelyanov, Y.; Golyandin, S.; Kustov, S.; Nikanorov, S. P.; Pugachev, G. S.; Sapozhnikov, K.; Sinani, A. B.; Humbeeck, Jan Van; Schaller, R.; Batist, R. De

doi:10.1016/s1359-6462(00)00538-8

Cited by 8 publications

(9 citation statements)

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“…Therefore, it is reasonable to suggest that a possible contribution of anelastic effects to the YM does not change appreciably with impact amplitude. This conclusion is contrary to what has been reported for the pi' martensite [4,5]. This difference can be associated with the presence and the absence of mobile quenched-in pinning points in the p/ and yi' martensites, respectively.…”

Section: Discussioncontrasting

confidence: 87%

“…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: 89%

“…Third, despite the dramatic shift of the YM in the martensite to lower values with the increase of the impact amplitude, the temperature trend is preserved. In contrast to the pi' martensite [3][4][5]8], no anomaly is detected in the YM temperature dependence. Figure 2 shows the IF stress amplitude dependence measured for as-quenched and impacted samples in the Pi phase at room temperature and in the yi' martensite at ~ 100 K. The stress amplitude rj m was recalculated from the strain amplitude e m measured experimentally: a m = E(E m ) x 8 m .…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…From the engineering standpoint, the properties of TMT materials under the ultimate conditions of high-energy impact loading are of a great importance. Recently, detailed investigations have been performed of the influence of the high-velocity impact loading on the performance and properties of Cu-AI-Ni single crystals of different compositions, both in the pi' martensite [3][4][5] and in the Pi phase [4,6]. An acoustic technique has been used extensively to detect the structural changes induced by the shock-wave loading of Cu-AI-Ni crystals.…”

Section: Introductionmentioning

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: Discussioncontrasting

confidence: 87%

Section: Discussionmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%