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A predictive mechanism for dynamic strain ageing in aluminium–magnesium alloys
Nature Materials, 2006Dynamic strain ageing (DSA) is the phenomenon in which solute atoms diffuse around dislocations and retard dislocation motion, leading to negative strain-rate sensitivity (nSRS) and thus to material instabilities during processing, an important issue in commercial metal alloys.
Curtin, W. A. +2 more
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Dynamic Strain Aging Studied at the Atomic Scale
Acta Materialia, 2015Abstract Dynamic strain aging arises from the interaction between solute atoms and matrix dislocations in strained metallic alloy. It initiates jerky dislocation motion and abrupt softening, causing negative strain rate sensitivity. This effect leads to instable flow phenomena at the macroscopic scale, appearing as a serrated stress–strain response ...
Pyuck-Pa Choi +2 more
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Concerning the strength of dynamic strain aging in zirconium
Metallurgical Transactions A, 1975Tensile tests on high purity (6 × 10−4 oxygen equivalent) and commercial purity (6 × 10−3 oxygen equivalent) zirconium were performed between 77 and 1000 K in order to evaluate dynamic strain aging. A comparison with earlier data from two equivalent titanium compositions yielded the following; reducing the interstitial concentration to the zone refined
A. M. Garde +3 more
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Constitutive modeling of dynamic strain aging in niobium
Materials Research Proceedings, 2023Abstract. As the temperature rises, metals should lose strength. However, under some combinations of strain rate and temperature, they show a dramatic increase in strength due to the interaction of impurity/solute atoms with the dislocations, a phenomenon known as dynamic strain aging (DSA). Thermomechanical stress-strain curves have been modeled using
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Dynamic strain age hardening of Cu-Be alloys
Metal Science, 1977AbstractThe effect of plastic strain on the ageing kinetics of Cu-Be alloys has been studied by means of yield-stress measurements and transmission electron microscopy. The results show that plastic strain introduced before ageing retards the ageing kinetics at lower temperatures but has little effect at higher temperatures, while simultaneous ...
Dj. Drobnjak, M. Jovanović, B. Djurić
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Fracture toughness in the dynamic strain ageing regime
Scripta Metallurgica et Materialia, 1991Interstitial elements, carbon and nitrogen, in iron and ferritic steels give rise to dynamic strain ageing (DSA) in the temperature range 293 to 573K. The occurrence of DSA is known to cause increases in the tensile strength and strain hardening exponent with an accompanying loss in ductility.
M. Srinivas +3 more
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Dynamic strain aging and plastic instabilities
Journal of the Mechanics and Physics of Solids, 1995A constitutive model based on dislocation-solute interaction and describing dynamic strain aging behavior, is analyzed for the simple loading case of uniaxial tension. The model is rate-dependent and includes a time-varying state variable, representing the local concentration of the impurity atoms at dislocations.
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Dynamic strain aging and serrated flow in MnO
Journal of Materials Research, 1986The effects of aging on the upper yield stress τupand serrated flow have been studied in MnO single crystals at 900 °C for oxygen partial pressuresρO2of 10−11and 10−7Pa. Aging initially increases τupas a consequence of segregation of aliovalent impurities to dislocations for bothρO2values. For long aging times andρO2= 10-11Pa, serrated flow accompanied
K. C. Goretta +2 more
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Dynamic strain aging and ductility minima in zirconium
Metallurgical Transactions, 1970Tensile tests using coarse grained zirconium specimens were conducted at two strain rates, differing by 3 orders of magnitude, between 77° and 1032°K. At each strain rate, peaks were observed when the flow stress was plotted against the temperature. The temperature corresponding to a given peak was observed to rise with increasing strain rate.
V. Ramachandran, R. E. Reed-Hill
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On the mechanism of serrated yielding and dynamic strain ageing
Acta Metallurgica, 1980Abstract Theoretical models of dynamic strain ageing in general and the onset of serrated yielding in particular are based on the interaction between moving dislocations and diffusing solute atoms. In substitutional solid solutions the solute diffusion is assumed to be caused by the vacancies produced by deformation.
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