Darken and Gurry. Aspects of the field, which merge with metal physics and physical metal- lurgy. Multiplication of Dislocations—Frank-Read Source. Phase metal will usually exhibit chemical segregation, and therefore the. End of this chapter and in the Manual on Fatigue Testing, ASTM Spec.

Abstract

The activity of FeTiO₃ in the binary ilmenitepyrophanite (FeTiO₃-MnTiO₃) solid solution has been determined for the temperature range 1050–1300 K by displacement of the reaction: 2 FeTiO₃=2 Fe+2 TiO₂+O₂ in T-μO₂ space, using an electrochemical technique with calcia- and yttria-stabilized zirconia solid electrolytes. The activities show small positive deviations from ideality, which, although the data are unusually precise, may be perfectly described by the simple regular solution model, with an interaction parameter, W^ilm_Fe-Mn, of 2.2±0.3 kJ g-atom⁻¹, which is independent of temperature. This value, together with the experimental data on the partitioning of Fe and Mn between ilmenite and garnet (Pownceby et al. 1987), gives W^gt_Fe-Mn=1.2±0.5 kJ g-atom⁻¹ for the almandine-spessartine (Fe₃Al₂Si₃O₁₂-Mn₃Al₂Si₃O₁₂) solid solution.

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This book is designed to suit the needs of the senior and graduate metallurgist in acquainting him with the fundamentals of the physical chemistry and the thermodynamics of metals and metallurgical processes. In this book the attempt is made to include this physical chemistry in simple terms and to present the fundamentals of chemical thermodynamics so that the student may be able to understand the thermodynamic method and apply it to metallurgical problems. The first portion summarizes modern views on the chemistry of the metallic state and briefly sketches the chemistry of other states with which the metallurgist must perforce deal. The later portions deal with thermodynamics, the treatment being mostly in the classical manner but with metallurgical applications and limitations always in mind. The sections on heterogeneous equilibrium discuss in some detail phases of variable composition, since these are common place at elevated temperature, particularly in metallurgical systems. The

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