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IN-SITU Investigation of deformation Mechanisms uSING non-destructive experimental techniques

AutorMáthisk, K.
Palabras claveMagnesium alloys
deformation mechanisms
Fecha de publicación26-feb-2016
ResumenOwing to their hexagonal close packed (HCP) structure and c/a ratio close to ideal value the deformation behavior of magnesium alloys differ from the other, e.g. fcc of bcc metals. The basal slip has the lowest value of critical resolved shear stress (CRSS), followed by prismatic slip and first-order pyramidal slip systems. All these slips provides deformation in 〈a〉 (i.e. 〈112 ̅0〉) direction and their combination provides only 4 independent slip systems. Therefore, the von Mises criterion requiring five independent slip systems for homogenous deformation is not fulfilled and activation of second-order pyramidal system or mechanical twinning is necessary. The experimental study of the deformation mechanisms includes both ­ex-situ (e.g. optical light, scanning or transmission electron microscopy) and in-situ techniques (e.g. diffraction methods, acoustic emission etc.). The main drawback of microscopy methods in studying twinning and dislocations is the relatively small observed volume in the specimen. On contrary, the irradiated volume in the neutron diffraction (ND) experiments provides statistically representative data. Acoustic emission (AE) is also a useful complementary experimental technique to diffraction methods during in-situ testing of the wrought Mg alloys. The main advantages of the method are the high time resolution and sensitivity to twin nucleation and collective dislocation motion. In the talk the influence of various microstructural and experimental parameters on the deformation mechanisms are elucidated using combined usage of AE and ND.
Aparece en las colecciones: (CENIM) Cursos-Material didáctico
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