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Nanomechanical Properties of Brittle Matter
Abstract The paper focuses on inelastic deformation of brittle materials, quasicrystals in particular. It is shown, that quasicrystals exhibit the normal indentation size effect (ISE) at room temperature, and the inverse one at elevated temperatures. Load-depth-curves exhibit distinct discontinuities, and unloading hysteresis was observed. The concept of energetic hardness is introduced to the calculation of nanohardness in general, and energetic arguments are used to discuss the ISE. Phason defect facilitated dislocation glide is proposed as a possible material displacement process for the smallest indents, whereas fragmentation and grain boundary sliding may be responsible for deformation of quasicrystals in the microhardness range.
Nanomechanical Properties of Brittle Matter
Abstract The paper focuses on inelastic deformation of brittle materials, quasicrystals in particular. It is shown, that quasicrystals exhibit the normal indentation size effect (ISE) at room temperature, and the inverse one at elevated temperatures. Load-depth-curves exhibit distinct discontinuities, and unloading hysteresis was observed. The concept of energetic hardness is introduced to the calculation of nanohardness in general, and energetic arguments are used to discuss the ISE. Phason defect facilitated dislocation glide is proposed as a possible material displacement process for the smallest indents, whereas fragmentation and grain boundary sliding may be responsible for deformation of quasicrystals in the microhardness range.
Nanomechanical Properties of Brittle Matter
Wolf, Bodo (Autor:in) / Paufler, Peter (Autor:in)
01.01.2001
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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