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The mechanical properties of layered, hexagonal-structured MAX phases oftenshow the combined merits of metals and ceramics, making them promising materialcandidates for safety critical applications. While their unique mechanicalperformance largely arises from the crystal structure, the effect of chemistryon the properties of these materials remains unclear. To study this, here weemployed two in situ electron microscope small scale testing approaches toexamine the micromechanical properties of Zr3AlC2, and compared the resultswith the properties of Ti3SiC2: we used micropillar compression tests tomeasure basal slip strength, and double cantilever beam splitting tests toevaluate fracture energy for basal plane delamination. We observed distinct andsystematic differences in these measured properties between Zr3AlC2 andTi3SiC2, where Zr3AlC2 appeared to be stronger but more brittle at themicroscale, and discussed the implications of the results in the selection,design, and engineering of MAX phases for targeted engineering applications.

Shear and delamination behaviour of basal planes in Zr3AlC2 MAX phase studied by micromechanical testing