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glasses'. Conventionally, amorphous alloys or metallic glasses were obtainable readily only in thin sections Amorphous alloys, and the partially or fully (<100 mm), signi cantly restricting their use (see next crystallised materials derived from them, can have properties attractive for a diverse range of section). A second reason for increased interest is that applications. In some cases, their wear resistance it has become clear that some of the most exceptional can be of primary concern, in others, it is an properties are obtained not in the fully amorphous important secondary property. The distinctive alloys, which were previously the focus of attention, mechanical properties of amorphous alloys make but rather in partially crystalline alloys with nanometheir wear resistance of fundamental interest also. tre scale microstructures. Both the magnetic3 andThis review focuses on the influence of a variety of mechanical4 properties of these 'nanophase composfactors in wear testing, on the mechanisms of ites' have been the subject of much research in recent wear, on the characteristics of different categories years. Yet a further point of interest is that amorphous of amorphous alloy, and on the effects of partial or alloys can be related to quasicrystalline alloys; complete crystallisation. It is shown that amorphous alloys can have very good resistance recently suggested applications of quasicrystals as to sliding and abrasive wear. The wear resistance coatings make it important to characterise their wear of related quasicrystalline phases is also resistance. considered. IMR/374 2002 IoM Communications Ltd and ASM International.

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