Author/Authors :
E. Calvié، نويسنده , , Emilie and Joly-Pottuz، نويسنده , , Lucile and Esnouf، نويسنده , , Claude and Clément، نويسنده , , Philippe and Garnier، نويسنده , , Vincent and Chevalier، نويسنده , , Jérôme and Jorand، نويسنده , , Yves and Malchère، نويسنده , , Annie and Epicier، نويسنده , , Thierry and Masenelli-Varlot، نويسنده , , Karine، نويسنده ,
Abstract :
The behavior of alumina nano-particles taken from a commercial powder is investigated during in situ compression experiments in a transmission electron microscope (TEM). Small particles of 40 nm in diameter can undergo severe plastic deformation without failure, whereas brittle fracture is observed for 120 nm sized nano-particles. This is evidence of a critical size under which alumina, at least in the form of nano-particles, cannot be considered as brittle materials even at room temperature and a direct observation of the grinding limit generally observed during ball milling.
Keywords :
Transmission electron microscopy , in situ , ceramics , Compression , Nano-particles
