軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
速報論文
マグネシウム単結晶の非底面すべりに対するセリウムの影響
林 昂佑津志田 雅之北原 弘基安藤 新二
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2019 年 69 巻 2 号 p. 125-127

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Mg–Ce alloy single crystals with different quantities of cerium were subjected to [1̄100] and [112̄0] tensile tests so as to clarify effects of cerium addition on activation of non-basal slips at room temperature. Mg–0.016 mol%Ce alloys yielded due to {101̄1} twins in [1̄100] tension tests. Mg–0.052 mol%Ce single crystals yielded due to {112̄2}〈1̄1̄23〉 second order pyramidal 〈c+a〉 slip (SPCS), similar to pure magnesium single crystals, in [112̄0] tensile tests. Cerium addition decreased critical resolved shear stresses (CRSS) for {101̄1} twinning and SPCS. The decrease in CRSS for SPCS likely results from that the frequency of sessile (c+a) dislocations decreased with decreasing stacking fault energy of second order pyramidal planes.

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