Mechanical characteristics of melt grown doped KMgF3 crystals

Results of indentation induced hardness testing studies conducted on (100) cleavages of melt grown KMgF3 crystals doped with 5% NiF2 are reported. Mechanical characteristics including Vickers microhardness, fracture mechanics, crack propagation, brittleness and yield strength of the crystal are asse...

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Bibliographic Details
Published in:Materials chemistry and physics 2003-02, Vol.78 (1), p.202-207
Main Authors: Lal, Banwari, Bamzai, K.K, Kotru, P.N
Format: Article
Language:English
Subjects:
Brittleness
Condensed matter: structure, mechanical and thermal properties
Crack propagation
Exact sciences and technology
Fracture toughness
KMgF3
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Microhardness
Physics
Tribology and hardness
Yield strength
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Summary:Results of indentation induced hardness testing studies conducted on (100) cleavages of melt grown KMgF3 crystals doped with 5% NiF2 are reported. Mechanical characteristics including Vickers microhardness, fracture mechanics, crack propagation, brittleness and yield strength of the crystal are assessed. Variation of microhardness with load is non-linear and is best explained by the concept of Newtonian resistance pressure as proposed by Hays and Kendall’s law. Classification of cracks and their transition from Palmqvist to median types is explained. The average values of fracture toughness (Kc), brittleness index (Bi) and yield strength (σy) are calculated using expressions for Palmqvist and median types of cracks.
ISSN:0254-0584
1879-3312
DOI:10.1016/S0254-0584(02)00342-5