刘秋杰,田保红,周孟,刘勇,张启萌,楚春贺

• 1:河南科技大学材料科学与工程学院
• 2:有色金属新材料与先进加工技术省部共建协同创新中心
• 3:河南科技大学应用工程学院

摘要(Abstract)：

采用真空快速热压烧结-内氧化法制备了0.3GO-0.3Ag/Al_2O_3-Cu/30Cr复合材料，借助显微硬度计、数字电导率仪、扫描电镜、能谱仪、X射线衍射、透射电镜和拉伸实验机等研究了复合材料烧结态的硬度、导电率、物相、微观组织与力学性能。在变形温度为650～950℃,应变速率为0.001～10 s~(-1)的条件下，采用Gleeble-1500D型热模拟实验机上对复合材料进行等温压缩试验，绘制了其真应力-真应变曲线；基于动态材料学模型，计算并建立了复合材料的本构方程，构建了热加工图，确定了该复合材料最佳热加工参数。结果表明：纳米γ-Al_2O_3颗粒弥散强化了0.3GO-0.3Ag/Al_2O_3-Cu/30Cr复合材料基体，Cr_(23)C_6颗粒钉扎相界面；复合材料结构致密，综合性能良好，其致密度为98.20%,导电率为46.1%IACS,硬度为158 HV0.5,抗拉强度为413 MPa;复合材料真应力-应变曲线具有典型的动态再结晶特征，其热激活能为279.954 kJ/mol,适宜的加工工艺参数范围为变形温度为750～950℃,应变速率为0.008～0.223 s~(-1)。

关键词(KeyWords)： 弥散铜-Cr复合材料;热变形行为;热加工图;热激活能

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金资助项目(2023TQ0107);; 河洛青年人才托举工程(2023HLTJ12)

作者(Author): 刘秋杰,田保红,周孟,刘勇,张启萌,楚春贺

DOI: 10.13289/j.issn.1009-6264.2024-0530

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