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Effects of Grain Size and Microcracking on the Thermal Diffusivity of MgTi 2 O 5
Author(s) -
SIEBENECK H. J.,
HASSELMAN D. P. H.,
CLEVELAND J. J.,
BRADT R. C.
Publication year - 1977
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1977.tb15555.x
Subject(s) - thermal diffusivity , materials science , grain size , crystallite , composite material , laser flash analysis , hysteresis , thermal , mineralogy , thermodynamics , metallurgy , thermal conductivity , geology , condensed matter physics , physics
The laser flash technique was used to study the effect of grain size on the thermal diffusivity of polycrystalline MgTi 2 O 5 from 25° to 800°C. Microcracking decreased the thermal diffusivity by as much as a factor of two with the decrease increasing with increasing grain size. When specimens were heated then cooled, the thermal diffusivity exhibited a horizontal flat figure‐eight hysteresis. This hysteresis, which appeared to be a function of the thermal history, was attributed to a balance between crack healing, or closure, at high temperatures and the growth of existing cracks or the formation of new cracks during cooling.
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