1971 Volume 18 Issue 4 Pages 132-135
The binary nickel-boron system up to 33.3 at % B was studied by thermal analysis, microscopic observation, and by X-ray diffraction. The results are summarized as follows:
(1) Two kind of intermetallic compounds of Ni3B (m.p. 1, 166°C) and Ni2B (m.p. 1, 125°C) were confirmed.
(2) Eutectic reactions were observed between Ni (solid solution) and Ni3B, and between Ni3B and Ni2B. The eutectic point of each reaction was 18.0 at % B, 1, 093°C and 30.0 at % B, 1, 103°C respectively.
(3) The solubilities of boron into nickel were below 0.1 at % at 850°C, and below 0.2 at % at 1, 000°C.
From these results, the phase diagram of Ni-B system up to 33.3 at % B was compiled.
