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Effect of low temperature thermocycling on microhardness anisotropy of commercially pure beryllium
Author(s) -
Lavrentev F. F.,
Pokhil Yu. A.,
Shayaeva Ch. Yu.
Publication year - 1985
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170200820
Subject(s) - indentation hardness , materials science , beryllium , anisotropy , extrusion , perpendicular , composite material , crucible (geodemography) , metallurgy , microstructure , chemistry , optics , geometry , physics , organic chemistry , mathematics , computational chemistry
Commerically pure beryllium polycrystals prepared by hot uniaxial crucible extrusion have been used for statistical investigation of the microhardness distribution on various faces distinguished by the orientation with respect to the extrusion axis. The microhardness anisotropy coefficient K (the relative difference of the statistical average values of microhardness for faces perpendicular and parallel to the extrusion axis) of the tested material was high. Low temperature thermocycling between 300 and 77 K essentially reduced K , which is thought to be a result of structural state changes and internal stress redistribution in the material induced by thermoeleastic stresses due to thermocycling. The result of the experiment is in qualitative agreement with data on the beryllium defect structure and fracture character found by transmission and scanning electron microscopy.