肖振朋,李韶林,贾淑果,宋克兴,国秀花,王旭,刘嵩

• 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
• 4:河南省科学院

摘要(Abstract)：

为改善Al_2O_3弥散强化铜的变形性能，通过向弥散强化铜中加入软质相纯铜组元，研究纯铜组元对弥散强化铜烧结坯变形性能的影响。对弥散铜烧结坯进行热压缩变形实验，获得了其不同热变形条件下的真应力应变曲线，建立了基于双曲正弦本构关系Arrhenius流变应力模型的本构方程，并计算获得热激活能值Q与应变速率敏感系数值m;对热挤压试样，进行室温性能检测和微观组织表征。结果表明：加入纯铜组元后，弥散铜烧结坯应力应变曲线峰值应力下降，曲线走势波动减弱，变形试样缺陷减少，热激活能Q降低，变形难度下降。应变速率较低时，纯铜组元的加入使得m值增加，弥散强化铜的塑性变好；应变速率较高时，纯铜组元的加入加剧基体软硬相不协调变形，m值降低，塑性变差。纯铜组元的加入使热挤压弥散铜的强化相浓度降低，硬度下降，导电率提升，晶粒变大。

关键词(KeyWords)： Al_2O_3弥散强化铜;热激活能;变形性能;烧结;热挤压

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金(2020T130172);中国博士后科学基金(2020M682288);; 河南省重点研发与推广专项(222102230064);; 河南省博士后经费资助(202002063);; 河南省高等学校重点科研项目(21A430014)

作者(Author): 肖振朋,李韶林,贾淑果,宋克兴,国秀花,王旭,刘嵩

DOI: 10.13289/j.issn.1009-6264.2022-0429

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