Creep Behavior of Squeeze-Cast Mg-15Gd Alloy

0570932 - ÚFM 2024 RIV CH eng J - Článek v odborném periodiku
Dobeš, Ferdinand - Dymáček, Petr
Creep Behavior of Squeeze-Cast Mg-15Gd Alloy.
Crystals. Roč. 13, č. 3 (2023), č. článku 374. ISSN 2073-4352. E-ISSN 2073-4352
Institucionální podpora: RVO:68081723
Klíčová slova: creep * magnesium alloy * gadolinium * squeeze casting * threshold stress
Obor OECD: Materials engineering
Impakt faktor: 2.7, rok: 2022
Způsob publikování: Open access
https://www.mdpi.com/2073-4352/13/3/374

The creep behavior of a binary Mg-15 wt.% Gd alloy was investigated over the temperature range from 523 K to 743 K, i.e., in both the single-phase region (the hexagonal close-packed solid solution of Gd in Mg) and the two-phase region (the solid solution plus Mg5Gd precipitates). The alloy was prepared by the squeeze casting technique. In the higher temperature range, at 723 and 743 K, the specimens were solution treated by in situ annealing prior to testing. At the temperature of 673 K and below, the alloy was tested in the cast state. In the higher temperature range, the behavior was interpreted in terms of the viscous glide, where the dislocation motion was constrained by the presence of solute atmospheres. The dislocation motion was controlled by the rate of the cross slip from the basal to the prismatic planes. At the temperatures of 623 K and 673 K, the creep behavior was rationalized by introducing the threshold stress concept. At the temperatures of 523 K and 573 K, the stresses required to achieve experimentally measurable creep rates were such that dislocations broke away from the atmospheres of foreign atoms. Comparison with a series of magnesium alloys prepared by squeeze casting and creep-tested by the same technique showed that gadolinium can be a favorable creep-resistance enhancing element.
Trvalý link: https://hdl.handle.net/11104/0342270