Impact metamorphosed compositions of the Fe-Si-Ni-S system

Miura, Y. and Fukuyama, S. and Gucsik, Arnold (1999) Impact metamorphosed compositions of the Fe-Si-Ni-S system. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 85 (1-3). pp. 188-191. ISSN 0924-0136

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Abstract

The characterization of impact materials is discussed from the point of view of compositional change after an impact event. Various compositions of impact-metamorphosed materials can be explained by vapor condition found as (a) reduction phase with vaporized phases, (b) melted condition as mixed amorphous grains of projectile and target materials, and (c) high-pressure conditions as solid phases of target materials. The composition of projectile materials is largely changed under different impact conditions. In fact, Fe–Ni metal phases of a projectile cannot be obtained as the same phases after impact by mixing with target materials, which are found in fine-grained or spherulitic particles in meteoritic impact craters or the Cretaceous–Tertiary (K:T) boundary. This is mainly because Fe–Ni phases formed by long annealing time within the closed system of asteroids cannot recrystallize as a single metallic phase after a short impact reaction. © 1999 Published by Elsevier Science S.A. All rights reserved.

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