杨雪瑞,田保红,张毅,刘勇,李全安,任凤章

• 1:河南科技大学材料科学与工程学院
• 2:河南省有色金属材料科学与加工技术重点实验室

摘要(Abstract)：

采用真空热压内氧化法制备纳米和微米Al2O3颗粒混杂增强弥散铜-Al2O3复合材料,对比研究了弥散铜和混杂增强弥散铜-0.9%Al2O3复合材料的密度、硬度、导电率和微观组织,采用Gleeble-1500D热模拟机的等温压缩实验探讨了两种弥散铜复合材料的热变形行为。结果表明,弥散铜-0.9%Al2O3复合材料基体内同时存在内氧化产生的纳米级Al2O3颗粒及机械添加的微米级Al2O3颗粒,烧结态致密度均大于97.7%,硬度158~176 HV,导电率60%IACS以上。两种复合材料变形温度600~950℃,应变速率0.001~1 s-1条件下的真应力-应变曲线具有典型的动态再结晶特征,真应力随应变量增加均先增大后减小,之后达到一个稳定状态。热变形过程中热激活能随少量Al2O3添加而明显增加,建立了其稳态真应力-真应变双曲正弦本构方程。

关键词(KeyWords)： 混杂增强;弥散铜;动态再结晶;本构方程

Abstract:

Keywords:

基金项目(Foundation): 国家和自然科学基金(51101052);; 河南省高校科技创新团队支持计划(2012IRTSHN008)

作者(Author): 杨雪瑞,田保红,张毅,刘勇,李全安,任凤章

DOI: 10.13289/j.issn.1009-6264.2014.01.001

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