Abstract
The Fe-Nb phase diagram [2002Oka] depicts two intermediate phases Fe2Nb ( ) and Fe7Nb6 ( ). The former is a Laves phase of the C14 type. Its homogeneity range is smaller than what was shown in the earlier reports. The phase has the D85, Fe7W6-type structure. The Fe-Ni phase diagram [1991Swa] is characterized by a very narrow solidification range, with a peritectic reaction at 1514 °C between body-centered cubic (bcc) and liquid that yields the Fe-based face-centered cubic (fcc) solid solution. A continuous solution denoted between fcc Fe and Ni is stable over a wide range of temperature. At 517 °C, an ordered phase FeNi3 forms congruently from . The Nb-Ni phase diagram [1998Oka] has two intermediate phases: Ni3Nb ( ) and Ni6Nb7 ( ). Ni3Nb is orthorhombic with the Cu3Titype D0a structure. The phase has the D85, Fe7W6-type structure.
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