李艳,刘勇,田保红,张毅,柴哲,朱顺新

• 1:河南科技大学材料科学与工程学院
• 2:有色金属共性技术河南省协同创新中心

摘要(Abstract)：

通过在Gleeble-1500D热模拟试验机上进行高温等温压缩试验,对Cu-0.4Zr合金在应变速率为0.001~10 s~(-1)、变形温度为550~900℃、最大变形程度为55%条件下的流变应力行为进行探讨。分析了该合金在高温变形时的流变应力和应变速率及变形温度之间的关系,并对其在热压缩过程中的组织演变进行观察。结果表明:热模拟试验中,应变速率和变形温度的变化强烈地影响合金流变应力的大小,流变应力随变形温度升高而下降,随应变速率提高而增大。结合流变应力、应变速率和变形温度的相关性,计算得出了该合金高温热压缩变形时的应力指数(n)、应力参数(α)、结构因子(A)、热变形激活能(Q)和本构方程。合金动态再结晶的显微组织强烈受到应变速率的影响。

关键词(KeyWords)： Cu-0.4Zr合金;热压缩变形;动态再结晶;本构方程

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51101052);; 河南省高校重点科研项目(15A430006)

作者(Author): 李艳,刘勇,田保红,张毅,柴哲,朱顺新

DOI: 10.13289/j.issn.1009-6264.2016.02.038

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