The Preparation and Characterization of Bulk Cu-Si Nanocrystalline Alloy under High Pressure
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摘要: 用压淬的方法，在6 GPa静高压下，以200 K/s的冷却速率冷却熔融状态的Cu70Si30合金，制备出块状Cu-Si纳米合金．X射线衍射和透射电子显微镜分析表明：该纳米合金由-Cu5Si和一未知相组成，未知相为简单立方晶体，晶格常数0=0.853 5 nm，其热力学状态为亚稳态。并对静高压下块状纳米合金的形成机理进行了探讨。Abstract: The Cu-Si nanocrystalline (NC) alloy was prepared by quenching the melted Cu70Si30 alloy at cooling rate 200 K/s under a pressure of 6 GPa. The bulk Cu70Si30NC alloy consists of -Cu5Si and an unknown phase. The crystal structure of the unknown phase is simple cubic system and lattice constant is 0.853 5 nm. The thermo stability of the bulk Cu70Si30NC alloy was carried out and an endothermic peak was observed, enthalpy of which is 2.667 5 J/g. The formation mechanism of the bulk Cu70Si30 alloy under high pressure was discussed.
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Key words:
- nanocrystalline alloy /
- pressure-quenched /
- supercooling
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