マグネシア単結晶の<100>方向の低応力域における高温クリープ

概要

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Creep behavior of MgO single crystals with<100>loading axis was investigated over temperature range from 1575゜ to 1725℃ and under compression stresses from 3 to 10 MPa. It was found that MgO single crystals had a sigmoidal creep behavior which can be described by Haasen's theory. Dislocation multiplication in which a few dislocation interactions were involved was responsible for the increase in creep rate at the initial stage of deformation. The stress exponents were measured to be about 3.4 at inflection point in sigmoidal creep curve and near 2.2 at steady state. The creep behavior at steady state mainly related to dislocation movement on two orthogonal conjugate {110}<110>slip systems. The main barriers to slip were caused by dislocation intersections occurring between two orthogonal {110} planes. The deformation at steady state was caused by dislocation gliding which depends on the climb motion. The dislocation substructure formed during creep was examined and the deformation mechanism was discussed.
社団法人日本セラミックス協会の論文
1993-03-01