Title
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
Author
Faculty/Department
Faculty of Applied Economics
Publication type
article
Publication
Les Ulis ,
Subject
Physics
Source (journal)
Journal de physique: 4. - Les Ulis, 1991 - 2006
Source (book)
8th European Symposium on Martensitic Transformations (ESOMAT2000), SEP 04-08, 2000, COMO, ITALY
Volume/pages
11(2001) :PR8 , p. 173-178
ISSN
1155-4339
ISI
000173253800031
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Experimental investigations of the influence of impact loading on properties of Cu-Al-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 2 x 10(-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 amplitude-independent 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 10(-7) - 2 x 10(-1). Experimental results indicate that beta(1)-->gamma(1)' 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 gamma(1)' 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 an isotropic martensitic variants during temperature-induced MT in impacted crystals. No influence of the impact loading on the transformation temperatures was detected for beta(1)-gamma(1)' 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.
E-info
https://repository.uantwerpen.be/docman/iruaauth/b887b4/2986041.pdf
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