Fe-Ni-Co-Ti系インバー合金の熱膨張特性に及ぼすNi,Tiの影響について

概要

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To obtain high strength Invar alloy for structural components, the effect of Ni and Ti on the thermal expansion of Fe-Ni-Co-Ti alloys was investigated in solution treated, cold drawn and aged condition. Ni content was varied in Fe-Ni-5%Co-3%Ti alloy series and Ti content was varied in Fe-38.5%Ni-5%Co-Ti alloy series. In solution treated condition, (Ni+Co) content corresponding to the minimum thermal expansion coefficient between 30 and 100°C was displaced as much as 1.7wt% by adding 1wt% Ti. And the thermal expansion coefficient between 30 and 100°C was increased about 0.6×10-6/°C by adding 1wt% Ti. The composition displacement was considered as follows; effective (Ni+Co) content could be decreased by adding Ti to Fe-Ni-Co alloys. By cold drawing, thermal expansion coefficient between 100 and 200°C was markedly diminished, while thermal expansion coefficient between 30 and 100°C showed no significant change. Aging Fe-Ni-Co-Ti alloys, high tensile strength was obtained and the shift of Ni content corresponding to the minimum value of thermal expansion was observed. This shift must be originated from the dilution of (Ni+Co) content in the matrix due to the precipitation of Ni-Ti intermetallic compound.
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