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Influence of annealing on stain hardening behaviour and fracture properties of a cryorolled Al 2014 alloy
Published in Elsevier Ltd
2015
Volume: 645
   
Pages: 383 - 392
Abstract
The influence of annealing on strength, ductility, strain hardening, plastic instability and fracture behaviour are studied in the present work on a cryorolled Al 2014 alloy by tensile test, transmission electron microscopy, macrograph analysis and fractography study. Investigations on the cryorolled alloy have been done for different annealing temperatures in the range of 100-400. °C and the results obtained are correlated with the microstructural evolution, precipitation behaviour and post failure analysis. Study reveals a complex trend in ductility and strain hardening behaviour as a result of simultaneous occurrence of dislocation annihilation, recrystallization and precipitation evolution during annealing. By investigations of fractured samples, dominant mode of fracture is found to be shear deformation and upon annealing the fracture mechanism is affected jointly by propagation of microvoids and shear deformation due to combined action of precipitation and microstructural evolution. Yield strength is increased by 4 times after cryorolling and retained after annealing up to 100. °C. It even remains higher than the base material up to 350. °C, due to the combined effect of precipitation hardening and thermal stability of microstructure. © 2015 Elsevier B.V.
About the journal
JournalData powered by TypesetMaterials Science and Engineering A
PublisherData powered by TypesetElsevier Ltd
ISSN09215093
Open AccessNo
Concepts (25)
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    Age hardening
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    Aluminum
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    Annealing
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    Ductility
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    FAILURE ANALYSIS
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    FRACTURE MECHANICS
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    Hardening
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    High resolution transmission electron microscopy
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    Mechanical properties
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    Microstructural evolution
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    Shear deformation
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    Strain
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    Strain hardening
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    Tensile testing
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    Thermodynamic stability
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    Transmission electron microscopy
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    Annealing temperatures
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    Cryo-rolling
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    DISLOCATION ANNIHILATION
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    FRACTURE ANALYSIS
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    Hardening behaviours
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    Plastic instabilities
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    PRECIPITATION BEHAVIOUR
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    ULTRAFINE GRAINED MATERIALS
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    Fracture