Fe-36%Ni インバー合金の熱膨張係数に及ぼす微量合金元素の影響

概要

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The effects of single addition (C, B<0.02%, Al<0.1%, others<0.5%) of various minor alloying elements such as C, Si, Mn, Cr, Mo, Cu, Nb, Ti, V, Al, W and B in 36%Ni base alloy on thermal expansion and Curie temperature (Tc) were investigated. The results obtained are as follows : (1) Thermal expansion coefficient between 30℃ and 100℃ (α_<30∿100℃>) increases with increase in the content of all these alloying elements. The magnitude of the effect of alloying elements on α_<30∿100℃> was evaluated quantitatively. α_<300∿400℃> increases also with increase in the content of these alloying elements except B and Cu. (2) It is found that α_<30∿100℃> of 36%Ni alloys with Tc lower than that of the base alloy tends to decrease with rise in Tc. On the other hand α_<30∿100℃> of the alloys with Tc higher than that of the base alloy tends to increase with rise in Tc. (3) Relation between α_<30∿100℃> and the mean number of valence electrons per atom (e/a) is classified into 3 groups which depend on number of valence electrons of alloying elements. α_<30∿100℃> in each group has good relation to e/a.
1994-12-01