Investigation of Specificity of Mechanical Properties of Hard Materials on Nanoscale with Use of SPM- Nanohardness Tester
N A Lvova; V D Blank; K V Gogolinskiy; V F Kulibaba; N A Lvova; Technological Institute for Superhard and Novel Carbon Materials (TISNCM), Troitsk, Moscow Region, Russian Federation; V D Blank; Technological Institute for Superhard and Novel Carbon Materials (TISNCM), Troitsk, Moscow Region, Russian Federation; K V Gogolinskiy; Technological Institute for Superhard and Novel Carbon Materials (TISNCM), Troitsk, Moscow Region, Russian Federation; V F Kulibaba; Technological Institute for Superhard and Novel Carbon Materials (TISNCM), Troitsk, Moscow Region, Russian Federation
Журнал:
Journal of Physics: Conference Series
Дата:
2007-04-01
Аннотация:
Specifisities of deformation on nanoscale of hard brittle materials with the hardness exceeding 10 GP by means of scanning probe microscope - nanohardness tester "NanoScan" are investigated. It is found, that pile-up is forming at scratching of sample surface with use of diamond indenter. Heigh of this pile-up depends on hardness and elastic modulus of the material. Definition of the contact area without taking into account height of pile-up leads to an overestimation of hardness values. At scratching of silicon carbide surface a transition from plastic flow to fracture is found out. The results received allowed to estimate fracture toughness K<sub>IC</sub> for silicon carbide.
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