Lhoest, Florian
[UCL]
Jacques, Pascal
[UCL]
In this work, the mechanical behaviour under compression at room and high temperature of a bulk Cr2AlC sample is studied. The microstructure resulting form conditions of loading and heat treatment during the sintering process are identified. The purity and the density of these samples are also determined. An additional phase present in the samples after sintering containing iron is observed and an identification of this phase is achieved. Hardness tests of Vicker and Berkovich are performed on sintered sample at room temperature with different grain sizes and different tips of indentation. The global and local hardness is then obtained. Sample are machined in two macroscopic shapes, square-based bar samples under the dimension 3x3x8 mm³ and cylinder samples with a diameter of 4 mm and a height of 8 mm. These samples are also extracted from the sintering specimen under different directions regarding the compaction direction. Then, they are compressed in a plasto-dilatometre at 800 and 1000°C at different amount of deformation and observed with scanning electron microscope to identify the mechanisms of damaging and deformation. Then, creep resistance of the Cr2AlC is studied for samples with different grain sizes and passed mechanical and thermal treatments. This property is compared with the other MAX-phase Ti3SiC2 and the dependence on the grain size is confirmed. Eventually, perspective for future researches to continue this study are proposed.
Bibliographic reference |
Lhoest, Florian. Study of the mechanical properties of sintered ternary carbide Cr2AlC as a function of temperature. Ecole polytechnique de Louvain, Université catholique de Louvain, 2018. Prom. : Jacques, Pascal. |
Permanent URL |
http://hdl.handle.net/2078.1/thesis:14666 |