Characterization of Macroscopic Mechanical Anisotropy of Magnetocaloric Gadolinium Cylinders
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The metallographic analysis of polycrystalline gadolinium cylinders revealed a microstructural anisotropy of some included phases in the extrusion and extrusion transversal directions. The amount of those phases in the material is not significant. However, the macroscopic anisotropy of mechanical properties needs to be verified. The strain distribution during compression loading was analyzed using finite element model (FEM) simulations. A FEM for the simulation of the elasto-plastic response of the Gd cylinders was performed. For this purpose, the experimentally obtained typical flow curve in the extrusion direction was used as the input data for the FEM model. Based on the dimensional similarity of the FEM model and the measured specimens, the potential appearance of macroscopic anisotropy is evaluated. Mechanical testing using compression cigar tests, as well as FEM, did not confirm any obvious effect of the elongated inclusions on the mechanical anisotropy of the gadolinium specimens.
This paper is part of research work within the national Research Programs Nr. P2-0132, Nr. P2-0270, and Nr. P2-0248 financed by the Slovene Ministry of Education, Science and Sport. The authors are very grateful for the financial support. The authors are also grateful to Prof. A. Kitanovski for offered specimens and the constructive discussions.
Conflict of interest
The authors declare that they have no conflict of interest.
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