Results 81 to 90 of about 1,554 (222)
On the activation energy for superplastic flow
, 1973 The equations of superplastic flow are used to show that for superplastic flow the activation energy at constant stress, Qσ, is not the same as the activation energy at constant strain rate, Q-ε, and that they are related by Qσ = (1/m) Q-ε where m is ...
Davies, G. J., Padmanabhan, K. A.
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Effect of microstructure refinement on low cycle fatigue behavior of Alloy 718
MATEC Web of Conferences, 2014 Microstructure refinement down to d ∼ 0.1–1 μm is known to enhance processing properties of hard-to-deform materials and particularly can be used for facilitating superplastic forming or roll-forming. However refined microstructure can compromise service
Mukhtarov Shamil, Utyashev Farid
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Is Superplasticity in the Future of Nanophase Materials? [PDF]
MRS Proceedings, 1990 ABSTRACTThe ultrafine grain sizes and high diffusivities in nanophase materials assembled from atomic clusters suggest that these materials may have a strong tendency toward superplastic mechanical behavior. Both small grain size and enhanced diffusivity can be expected to lead to increased diffusional creep rates as well as to a significantly greater ...
openaire +1 more source
Evolution of atmospheric corrosion of superplastic Zn-Al alloys exposed to an industrial environment
, 2015 The microsturcture and atmospheric corrosion of superplastic Zn-Al alloys with various Al contents was investigated in an industrial environment. With increased Al content, the corrosion rates of the four samples initially increased and then decreased ...
J. He +9 more
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Superplastic deformation behavior of a rapidly solidified Al-Li alloy
, 2019 This study aims at investigating the superplastic behavior of a rapidly solidified Al-3Li-1Cu-0.5Mg-0.5Zr (mass%) alloy. Although rapidly solidified AI-Li alloys have the very fine grain structure desirable for improved superplasticity, unfavorable oxide
Koh, HJ, Lee, EW, Kim, NJ, Lee, S
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Superplastic behaviour of fine-grained IN-718 superalloy
, 1994 A number of nickel based alloys, conventional cast and wrought, powder consolidated and oxide dispersion strengthened materials, have shown a superplastic behaviour when thermomechanically processed to a fine grain microstructure.
A. Afrikantov +4 more
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MetalsBiodegradable magnesium (Mg) alloys are promising materials for temporary orthopaedic implants, combining favourable mechanical properties and superplastic behaviour with in vivo resorption.
Angela De Luca +13 more
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, 2013 An Al–33% Cu eutectic alloy was processed by high-pressure torsion (HPT) at a pressure of 6.0 GPa for 1/4 to 10 turns. Examination after processing showed a gradual evolution to a reasonable level of hardness and microstructural homogeneity after 5 or ...
Kawasaki, Megumi +3 more
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Interfacial phenomena and microstructural evolution during superplastic deformation
, 2001 Certain polycrystalline materials of fine equiaxed grains of size < 10 mum exhibit tensile ductility of several hundred to a few thousand per cent, called superplasticity, at intermediate strain rates and high temperatures.
KASHYAP, BP
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Modeling microstructural evolution and the mechanical response of superplastic materials
, 1993 A model has been developed that accounts for grain growth during, superplastic flow and its subsequent influence on stress-strain-strain rate behavior. These studies are experimentally based and have involved two different types of superplastic materials
Syn, C. K. +3 more
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