杨志强,刘勇,田保红,张毅

• 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)：

利用Gleeble-1500D热力模拟试验机,在温度为450~850℃、应变速率为0.001~1 s-1、真应变量0.7的条件下,研究和分析10 vol%TiC/Cu-Al2O3复合材料高温塑性变形及动态再结晶行为。结果表明,材料的高温流变应力-应变曲线主要以动态再结晶软化机制为特征,峰值应力随变形温度降低或应变速率升高而增加,属于温度和应变速率敏感材料;材料热激活能为170.737 kJ/mol;其硬化率-应力(θ-σ)曲线均呈现拐点且-dθ/dσ-σ曲线出现极小值;临界应变随应变速率的增大及变形温度的降低而增加,且临界应变(εc)与峰值应变(εp)之间具有一定相关性,即εc/εp=0.704;临界应变与Z参数之间的函数关系为εc=1.48"10-2Z0.0765。

关键词(KeyWords)： 10 vol%TiC/Cu-Al2O3复合材料;热变形;流变应力;动态再结晶;临界应变

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51101052);; 河南科技大学博士科研启动基金(09001199)

作者(Author): 杨志强,刘勇,田保红,张毅

DOI: 10.13289/j.issn.1009-6264.2013.12.006

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