摘要
用压淬的方法，在６ＧＰａ静高压下，以２００Ｋ／ｓ的冷却速率冷却熔融状态的Ｃｕ＿（７０）Ｓｉ＿（３０）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γ－Ｃｕ＿５Ｓｉ和一未知相组成，未知相为简单立方晶体，晶格常数α＝０．８５３５ｎｍ，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。
TheCu-Si nanocrystalline(NC)alloy was prepared by quenching the melted Cu_(70)Si_(30) alloy at cooling rate 200K/s under a pressure of 6GPa. The bulk Cu_(70)Si_(30)NC alloy consists ofγ-Cu_5Si and an unknown phases.The crystal structure of the unknown phase is simple cubic sys-tem and lattice constant is0.8535nm. The thermostability of the bulk Cu_(70)Si_(30) NC alloy was car-ried out and an endothermic peak was observed,enthalpy of which is 2.66 7 5J/g.The formationmechanism of the bulk Cu_(70)Si_(30) alloy under high pressure was discussed.
出处
《高压物理学报》
CAS
CSCD
北大核心
1995年第2期117-123,共7页
Chinese Journal of High Pressure Physics
基金
中国科学院金属研究所快速凝固非平衡合金国家重点实验室资助
关键词
纳米合金
压淬
过冷度
铜硅合金
nanocrystalline alloy,pressure-quenched,supercooling.
