熱間静水圧プレス処理したTi-Co合金の特性に及ぼす原料Ti粉末の影響

概要

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Static tensile properties of HIPed Ti-Co binary alloys containing 2 wt% or 4wt%Co were studied, and metallographic and fractographic observation were also carried out by scanning electron microscope and X-ray energy dispersion analysis.<BR>Despite the low level of oxygen content, the HIPed specimen using Hunter process sponge fines as titanium source, showed poorer ductility properties than the HIPed specimen using hydride-dehidride Kroll process sponge fines of high oxygen content as titanium source, and it was confirmed that the above mentioned ductility degradation was closely related to the existing NaCl in the HIPed specimen using Hunter process sponge fines. Brittle fracture was observed in a part of the specimen using Hunter process sponge fines, which is also considered to be due to the above mentioned NaCl existing in the HIPed specimen using Hunter process sponge fines.