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Some aspects of anelastic and microplastic creep of pure Al and two Al-alloys
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This study measured anelastic and microplastic creep of pure aluminum and two aluminum-copper alloys at room temperature using high-resolution laser interferometry, finding that materials loaded below their elastic limit can exhibit either pure anelastic behavior or additional viscoelastic creep. The irreversible deformation component depended logarithmically on load time and was influenced by surface condition and cold work.
Anelastic creep of pure Al, commercial Al-Cu and a binary AI-Cu alloy has been measured at room temperature by means of a high resolution laser interferometer.The irreversible component of the deformation was also quantified from measurements of the anelastic creep recovery.The dependence of the deformation-time curves on thermal treatment and cold work is analyzed.The mechanisms responsible for the room temperature anelastic creep are discussed.Materials loaded below their elastic limit can present either a pure anelastic behavior (commercial A-Cu) or additional viscoelastic creep (pure Al, high purity Al-Cu).For commercial Al-Cu, the presence of an irreversible deformation appears to be mainly related to the state of the surface.A viscoelastic after effect has been measured for this alloy after a Cu-electroplating treatment.As a typical result for room temperature creep, the irreversible deformation depends logarithmically on load time.
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Measurement of Microdeformation for Aluminum Specimen with Large Grain
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Laser-based optical measurement was used to analyze the non-uniform microdeformation of aluminum specimens with large grains, revealing high shear strains at grain boundaries during slip. The experimental results provide direct evidence supporting theories of microplastic deformation at grain boundaries in coarse-grained metals.
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