|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Mechanical Behavior of Light Metal Alloys with Grain Size Distribution in a Wide Range of Strain Rates
||Vladimir Skripnyak, Vladimir V. Skripnyak, Evgenia Skripnyak, Irina Vaganova, Natalia Skripnyak
|On-Site Speaker (Planned)
Mechanical behavior of aluminum (Al-Mg-Si – AMg6) and magnesium (Mg-Al-Zn-Mn – МА2 and MA8) alloys with a distribution of grain size was investigated under uniaxial tension in wide range of strain rates. The grain size distributions were created in thin sheets of alloys by severe plastic deformation using the technique of groove pressing or ultrasonic impact treatment. The occurrence of a bimodal grain size distribution causes the increase of alloy’s ductility, but decrease of the tensile strength. Strain to fracture of alloys depends on the relative volumes of ultrafine-grains. The multiscale model was developed for prediction of plastic deformation and fracture of alloys with a unimodal and a bimodal grain size distribution under dynamic loading. Macroscopic fracture is considered as a result of the formation of percolation clusters of damage at the mesoscopic level. The nucleation of damages under loading is associated with strain localization in UFG partial volumes.
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