徐国杨,国秀花,李韶林,宋克兴,刘嵩,肖振朋

• 1:河南科技大学材料科学与工程学院
• 2:河南省有色金属材料科学与加工技术重点实验室
• 3:河南省科学院
• 4:河南省先进导体材料重点实验室

摘要(Abstract)：

为探究Al_2O_3含量对Al_2O_3/Cu复合材料热变形行为的影响，采用内氧化法制备了3种Al_2O_3含量(0.28、0.66和1.13 mass%)的Al_2O_3/Cu复合材料，通过热模拟实验对其热变形行为进行了研究。结果表明：在823、923和1223 K时，随着Al_2O_3/Cu复合材料中Al_2O_3含量的增加，复合材料的峰值应力逐渐增大；显微组织观察发现，由于1.13 Al_2O_3/Cu复合材料内动态软化积累程度最大，导致其在1023和1123 K下出现了峰值应力下降现象。经热挤压后，在热变形过程中Al_2O_3/Cu复合材料的软化效果以动态回复为主。同时，发现0.28 Al_2O_3/Cu和0.66 Al_2O_3/Cu复合材料的热激活能相近，1.13 Al_2O_3/Cu复合材料的热激活能远高于前两者，并分别获得了不同Al_2O_3含量的Al_2O_3/Cu复合材料本构关系。采用动态材料模型(DMM)建立了Al_2O_3/Cu复合材料的热加工图，随着Al_2O_3含量的增加，热加工图中功率耗散系数η>0.3区域逐渐减小且向高温高应变速率方向移动；就失稳面积而言，0.66 Al_2O_3/Cu复合材料的失稳区域占比最小。

关键词(KeyWords)： Al_2O_3/Cu复合材料;热压缩;本构关系;热激活能;热加工图

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金(2020T130172,2020M682288);; 河南省重点研与推广专项(212102210110);; 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): 徐国杨,国秀花,李韶林,宋克兴,刘嵩,肖振朋

DOI: 10.13289/j.issn.1009-6264.2022-0613

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