Ni 基超耐熱合金中の M_5B_3 型ほう化物

概要

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No boride other than of M_3B_2-type has been reported to be present in nickel-base superalloys, and most of the M's in M_3B_2 are considered, for PHACOMP, to be molybdenum or tungsten. However, tungsten-rich M_3B_2 is not probable to form in some recent nickel-base alloys containing tungsten instead of molybdenum, since the W-B system does not have a boride of this type. In this experiment, high-boron cobalt-free Mar-M200 type alloys, containing tungsten but free from molybdenum, were examined to determine the type of boride. X-ray and chemical analyses of the residue indicated that the boride in the alloys was M_5B_3 which was considered to be formed by substituting a portion of chromium atoms in Cr_5B_3 by tungsten atoms, i. e. (Cr, W)_5B_3. W_5B_3, however, is not present in the W-B system.
社団法人日本鉄鋼協会の論文
1977-05-01