2099合金的热变形行为及组织演化

中国有色金属学报, 2014, 24(7): 1693-1699.

2099合金的热变形行为及组织演化

张飞 ^1, , 沈健 ^2, , 闫晓东 ^3, , 孙建林 ^4, , 陈松 ^5, , 白云峰 ^6, , 周华 ^7,

1.北京有色金属研究总院有色金属加工中心,北京100088;北京科技大学材料科学与工程学院,北京100083

2.北京有色金属研究总院有色金属加工中心,北京,100088

3.北京有色金属研究总院有色金属加工中心,北京,100088

4.北京科技大学材料科学与工程学院,北京,100083

5.北京有色金属研究总院有色金属加工中心,北京,100088

6.鞍山钢铁集团公司,鞍山,114021

7.西南铝业(集团)有限责任公司,重庆,401326

基金项目: 国家重点基础研究发展计划资助项目(2012CB619504)

关键词： 2099合金 , 应变 , 变形温度 , 应变速率 , 方差分析

Hot deformation behavior and microstructure evolution of 2099 alloy

Keywords： 2099 alloy , strain , deformation temperatures , strain rates , variance analysis

采用热压缩试验、方差分析和TEM技术研究变形条件对2099合金流变行为的影响规律和组织演化特征.结果表明:随着应变的增加,2099合金流变应力经历了过渡变形和稳态变形两个阶段.在显著性水平为0.01条件下,变形温度和应变速率对2099合金流变应力的影响高度显著,表明该合金为正的应变速率和负的变形温度敏感性材料.且随着应变的增加、变形温度的升高和应变速率的降低,合金组织依次经历了无规则的位错缠结→多边形化→晶界弓出形核+亚晶合并→再结晶晶粒长大过程.当变形温度为460℃、应变速率为0.01 s-1、应变量为1.1时,合金可获得细小的再结晶组织.

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