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Dynamic strain aging in aluminum alloys
Materials Science and Engineering, 1974Abstract The athermal component of flow stress, as it is normally determined, is frequently in error for polycrystalline alloys of aluminum. The reason is that a transient occurs in the flow stress-deformation temperature curve for these alloys the character of which is a result of dynamic strain aging.
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Dynamic strain ageing in mild steel
Acta Metallurgica, 1966Abstract The grain size dependence of the yield and flow stresses for mild steel have been investigated over the temperature range 20°C2–400°C and dislocation densities of fine grained specimens have also been measured over the same temperature interval.
B.J Brindley, J.T Barnby
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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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A TECHNIQUE TO PROBE DYNAMIC STRAIN AGEING
1993A technique based on the ramped oscillatory test was developed to probe dynamic strain ageing. Frequency responses of the flow stress and strain rate associated with ramped oscillatory tests were recorded in an Al-Mg-Si alloy. In the regime of dynamic strain ageing, the frequency responses were observed to undergo a fundamental change with increasing ...
C.P. Ling, P.G. McCormick, Y. Estrin
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Dynamic Strain Aging of Various Steels
Metallurgical Transactions A, 1982The dynamic strain aging characteristics of two dual phase steels, a high strength low alloy (HSLA) steel, a 1008 steel and an interstitial free (IF) steel were determined from tensile properties at temperatures in the range 295 to 460 K (22 to 187 °C) and strain rates between 6 × 10-6 to 10-2s-1. All except the IF steel were found to be susceptible to
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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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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 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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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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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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