Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Influence of Sn, Fe and Ag addition on amorphization and thermal stability of mechanically alloyed CuTiZrNi alloys

nr katalogowy: 52721

There have been many works on the development of new alloy systems showing enhanced glass forming ability, enabling the formation of bulk metallic glasses (BMG). Over the past decade, BMGs have gained considerable attention due to their properties (high yield strength, hardness and elastic strain limit, relatively high fracture toughness, fatigue resistance and corrosion resistance) and potential as new structural materials [1÷3]. Nowadays Cu based bulk metallic glasses are considered as potential engineering materials due to their good mechanical properties [4]. Various Cu based alloys have been reported to show the enhanced glass forming ability, enabling the preparation of bulk alloys by conventional casting methods [5]. These alloys usually belong to the CuTiZrNi system, sometimes Hf, Al or Y are also added. Recently, the influence of Fe, Si, Pb and Sn addition on the glass forming ability and crystallization of CuTiZrNi BMGs has been studied [6]. Another possibility of fabrication of bulk amorphous alloys is consolidation of amorphous powders obtained by melt atomisation or by mechanical alloying technique. Hot pressing, extrusion or spark plasma sintering of amorphous powders in the temperature range between glass transition temperature and onset crystallization temperature allow the fabrication of bulk amorphous samples. There are few reports only on the mechanical alloying of the CuTiZrNi powder mixtures [7÷9], showing the amorphization possibility in this system. The starting point for many studies is Cu47Ti34Zr11Ni8 alloy elaborated by W. L. Johnson [10]. In the present work, the influence of chemical composition on the amorphization and thermal stability of mechanically alloyed CuTiZrNi elemental powder mixtures was studied. The basic Cu47Ti34Zr11Ni8 composition was modified by replacing Ni by Sn and replacing Zr by Ag [...]

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