朱顺新,刘勇,李艳,田保红,张毅,宋克兴

• 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
• 3:河南省有色金属材料科学与加工技术重点实验室

摘要(Abstract)：

利用Gleeble-1500D型热模拟试验机对Cu-0.4Zr-0.15Y合金进行高温单次轴向热压缩试验,研究该合金在应变速率范围为0.001~10 s~(-1),热变形温度为550~900℃条件下的热变形行为。通过真应力-真应变数据得出材料的加工硬化率θ,结合lnθ-ε曲线和-(lnθ)/ε-ε曲线特征,研究Cu-0.4Zr-0.15Y合金热变形过程的再结晶临界条件。结果表明:Cu-0.4Zr-0.15Y合金应力-应变具有动态再结晶特征;该合金的lnθ-ε曲线拐点处对应于-(lnθ)/ε-ε曲线的最小值,最小值所对应的应变是临界应变ε_c;临界应变ε_c的变化与应变速率和变形温度有关,临界应变ε_c与Zener-Hollomon参数Z之间的函数关系为ε_c=6.4×10~(-3)Z~(0.07768),且临界应变ε_c与峰值应变ε_p之间满足ε_c/ε_p=0.448。同时,Cu-0.4Zr-0.15Y合金发生动态再结晶组织演变与变形温度和应变速率有关。

关键词(KeyWords)： Cu-0.4Zr-0.15Y合金;加工硬化率;动态再结晶;临界条件;组织演变

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): 朱顺新,刘勇,李艳,田保红,张毅,宋克兴

DOI: 10.13289/j.issn.1009-6264.2016-X346

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