アーク溶解したTi-Ni形状記憶合金の変態温度に及ぼす窒素の影響

概要

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Effects of nitrogen on microstructure and phase transformation temperatures were investigated for near-equiataomic Ti-Ni shape memory alloys arc-melted in Ar-N_2 atmospheres. The nitrogen content in the arc-melted specimens increased with increasing melting time and rising nitrogen partial pressure in atmosphere (arc current 150 A, arc voltage 12 V, specimen weight 12 g and melting time 0〜480 s). With increasing nitrogen content, the amount of second phase observed in arc-melted specimen increased. The second phase was identified as TiN by an electron probe microanalysis and an X-ray diffraction analysis. Both Ms and Af temperatures decreased with increasing nitrogen content of arc-melted specimen. The temperatures of Ms and Af were described by functions of nickel and nitrogen contents.
社団法人溶接学会の論文
1999-02-05