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Abstract
The alloying behavior in nanometer(nm)-sized particles has been studied by transmission electron microscopy (TEM). When solute atoms are vapor-deposited onto nm-sized particles kept at room temperature, rapid dissolution of solute atoms into particles takes place and solid solution or compound particles are successfully formed. Such spontaneous alloying occurs even between nm-sized particles of different elements. Results can be summarized as follows. (1) Spontaneous alloying takes place via a solid-state process. (2) Spontaneous alloying becomes more difficult with increasing particle size. (3) Spontaneous alloying is not an artifact originating from the temperature rise in particles which might be induced by the heat of condensation. (4) The critical size of initial particles below which alloy particles are successfully formed by spontaneous alloying increases with increasing heat of alloy formation.
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