Effects of low temperature aging and reversion treatment on serration of Al-Mg-Si alloys.

Relations among load fluctuation, geometrical shape and propagation behavior of a deformation band were examined for an inhomogeneous plastic deformation generated at relatively low temperature. The geometrical shape and propagation behavior of the deformation band were evaluated by strain gauges and surface roughness of specimen. Quantitative analysis of the load fluctuation was also carried out by fast Fourier transform method. The following results were obtained. A wavy load fluctuation was observed in two-deformation regions; i.e., one of which was a yield deformation region and the other was a serration one. The geometrical shape and the tilt of the deformation band in each deformation region were similar, while the number of cycles, the velocity of propagation and the amount of increasing strain were different each other. However, it was clearly shown that the wavy load fluctuation generated in each deformation region resulted from a continuous propagation of the deformation band.

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Serration, deformation band, and strain marking in a 5083 aluminum alloy at 318 K and related tempereture dependencies

栄浩¹,

享平²,

昌伸³

2007

J. Japan Inst. Light Metals

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Stress fluctuation, deformation band, and strain marking in a tensile deformed 5083 aluminum alloy plate at 318K were examined using an Instron tensile machine, a stylus surface profiler, and strain gauges; related temperature dependencies were also investigated. A saw-tooth stress fluctuation was generated in the nominal stress vs. nominal strain curves in two different deformation regions, a yield point region and a region advanced by plastic deformation. A surface profiler revealed that an intermittent formation of the deformation band, known as a parallel band, resulted in both a saw-toothlike stress fluctuation and a stair-like strain increase. The temperature dependencies of stress fluctuation, deformation band, and strain marking indicated that changes from a wavy stress fluctuation to a saw-tooth-like one with increasing deformation temperature were due to a variation in the propagation velocity and a repetition of the intermittent formation of the deformation band.

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Effects of low temperature aging and reversion treatment on serration of Al-Mg-Si alloys.

Cited by 6 publications

References 11 publications

Dynamic Observation of Mild Strain Concentrated Necking during Tensile Deformation in Solution Treated AA6061 Using Electronic Speckle Pattern Interferometry

Dynamic Observation of Mild Strain Concentrated Necking during Tensile Deformation in Solution Treated AA6061 Using Electronic Speckle Pattern Interferometry

Serration, deformation band propagation and strain marking in a 5083 aluminum alloy at low temperature

Serration, deformation band, and strain marking in a 5083 aluminum alloy at 318 K and related tempereture dependencies

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