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A study of ZrCo and related ternary phases represented by the general formula, Zr50Co50 − xNix

1974; Elsevier BV; Volume: 37; Issue: 1 Linguagem: Inglês

10.1016/0022-5088(74)90006-x

1878-2728

Delower Hossain, I.R. Harris, K.G. Barraclough,

Hydrogen Storage and Materials

As an essential preliminary to the study of the mechanical behaviour and physical properties of some ternary intermediate phases represented by the general formula, Zr50Co50 − xNix (where x represents the atomic percent, and varies from 0 to 50), the structure and constitution of these alloys have been investigated. Metallographic examination of the binary ZrCo phase indicates that it melts congruently and there is also evidence of a Widmanstätten-type precipitate and a eutectoid decomposition in the ZrCo phase after certain mechanical and heat treatments. The effect of substituting cobalt with nickel in the ternary alloys is to produce a room-temperature, martensitic structure at approximately the 14% Ni★ composition. At certain temperatures, appreciable ductility is observed in the range 6–14% Ni and the marked temperature dependence of the mechanical properties is thought to be related to the transformation characteristics of the ternary alloys. The electrical resistivity measurements in the temperature range 77–300 K indicate a possible low-temperature phase transition at the 10 and 12% Ni compositions.