The Constitution of the Alloys of Iron and Nickel

Abstract

THE joint paper by Dr. Hanson, of the National Physical Laboratory, and Mr. J. R. Freeman, jun., of the United States Bureau of Standards, on the above subject, presented at the May meetirig of the Iron and Steel Institute, is one of great valu:. Of the elements used for alloying with iron for scientific and industrial purposes, none is more important than nickel. Moreover, the fact that it is an invariable constituent of meteoric iron, which may be regarded as a natural nickel-iron alloy, has invested the question of the equilibrium of these two elements with a high degree of interest. Its determination, however, has presented serious problems, due, on one hand, to the high melting ranges of the alloys and consequent pyrometric difficulties, and, on the other hand, to the difficulty of preparing the alloys free from carbon. Three years ago Dr. and Mrs. Hanson carried out a revision of the constitution of these alloys at temperatures below 900° C. The present publication completes this work right t up to the liquidus of the system.