PUMA
Istituto dei materiali per l'elettronica ed il magnetismo     
Kaur B., Bhat M., Licci F., Kumar R., Kotru P. N., Bamzai K. K. Effect of 50 MeV Li3+ ion irradiation on mechanical characteristics of pure and Ga-In substituted M-type strontium hexaferrite. In: Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions With Materials and Atoms, vol. 222 (1-2) pp. 175 - 186. Elsevier, 2004.
 
 
Abstract
(English)
The 50 MeV Li3+ ion irradiation induced modification on mechanical characteristics of flux grown strontium hexaferrite crystals of the type SrGaxInyFe12-(x+y)O19 (where x = 0, 5, 7, 9 and y = 0, 0.8, 1.3, 1.0) have been studied. Mechanical characteristics including Vicker's microhardness, density, fracture mechanics, crack propagation, brittleness index, yield strength of the crystals are assessed. Variation of microhardness with load is explained by using Hays and Kendall's law with the concept of Newtonian resultant pressure. The decrease in Vickers microhardness values of irradiated crystals is explained because of amorphization in the material. The cracks developed are classified into palmqvist and median types. Variation of load independent H-v and density with Ga-In concentration are discussed. The average values of fracture toughness (K-c), brittleness index (B-i) and yield strength (sigma(y)) are also determined.
DOI: 10.1016/j.nimb.2004.01.022
Subject Irradiation; Microhardness; Hexagonal ferrite; Crack propagation
61.80.Jh
46.50.+a
62.20.Mk


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