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MM: Fachverband Metall- und Materialphysik

MM 22: Liquid and Amorphous Metals - Metallic Glass

MM 22.3: Vortrag

Dienstag, 17. März 2020, 10:45–11:00, IFW D

Investigation of creep in Pd40Ni40P20 metallic glasses — •Christian Aaron Rigoni, Sergiy Divinski, and Gerhard Wilde — Institute of Materials Physics, Münster, Germany

Metallic glasses are well known for their distinguished mechanical properties like high hardness and tensile strength, but marginal - if any - ductility. Therefore, long-time behaviour of metallic glasses under creep conditions is important for an optimal application of the material in order to prevent unexpected failures. In contrast to crystalline materials, where the creep mechanisms are well understood in terms of evolution of lattice defects, these mechanisms are still not well known for metallic glasses especially at temperatures far below Tg, where plastic deformation occurs through shear banding effecting local areas (shear transformation zones). Pd40Ni40P20 is chosen as a model metallic glass due to its high thermal stability over a wide temperature range and superior glass forming abilities. Even though Pd40Ni40P20 is a good glass former, the casted bulk samples are limited to certain sample dimensions, which makes classical tensile testing machines useless for this application. In our case the measurements are proceeded in a miniaturized tensile testing machine, which uses a sample length of about 4 mm with a gauge section of about 0.3 mm2. The first results on creep behaviour at temperatures 400 to 470 K (more than 100 K below Tg) are presented and discussed.