電子線衝撃溶解法によって作製したTa単結晶の機械的性質におよぼす結晶方位の影響

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Effects of cold roll and compression on Ta single crystals grown by electron beam melting methods were systematically studied.<BR>The rolling effect was determined using X-ray techniques and microphotography at successive stages of roll-ing, and the operating slip systems were determind from observations of slip traces on the side and front surfaces rolled. The mean grain size and the mean strain were determined by using the Hall method. The rolling texture was determined by the X-ray pole figure method at successive stages of rolling.<BR>Stress-strain curves of various Ta single crystals were obtained in order to clarify the effect of compressive deformation. The following results were obtained: According to the X-ray investigations and surface observa-tions, the mechanical structure of Ta single crystals subject to cold rolling is destroyed in the order, {110}-<110> and <111>, {111}-<110>, and {100}-<010> and <011>.<BR>The work-hardening effect of Ta crystals, examined by using compression tests, was determined to be, small and in the order, of directions <110>, <111> and <100>. The cold-rolled texture of Ta single crystals is grouped in {100}-<110> and {111}-<l12> orientations, and it is the same as that of Fe single crystals.
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