Hiroaki Rikihisa, Takashi Mori, M. Tsushida, H. Kitahara, S. Ando
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Influence of Yttrium Addition on Plastic Deformation of Magnesium
In this study, tensile tests of Mg - Y alloy single crystals and polycrystals were carried out to investigate influence of yttrium on activities of slip systems and a relationship between ductility of magnesium and active slip systems. Tensile directions of the single crystals and the polycrystals were parallel to ( 0001 ) and its rolling direction, respectively. Both tests were carried out at room temperature. Yield stress and ductility of Mg -( 0 . 6 - 1 . 1 ) at % Y alloy single crystals were higher than that of pure Mg and the crystals were yielded due to first order pyramidal slip ( FPCS ) . Mg - 0 . 9 at % Y alloy polycrystals showed higher ductility than pure Mg. The number of grains in which second order pyramidal slip can be activated was larger than that of non - basal slips in pure Mg, while the number for FPCS was increased with increasing strain in Mg - 0 . 9 at % Y alloy. We supposed that high ductil - ity of Mg - 0 . 9 at % Y alloy would be caused activation of FPCS by yttrium addition. [ doi:10 . 2320 / jinstmet.J2017016 ]