杨思尧,李树丰,张鑫,刘磊,潘登,高丽娜,张亚锟,李波

• 1:西安理工大学材料科学与工程学院
• 2:西安市先进粉末冶金材料与新技术重点实验室

摘要(Abstract)：

采用粉末冶金法,通过六方氮化硼纳米片(BNNSs)与Al的原位反应制备多元混杂增强铝基复合材料,研究了BNNSs与Al的原位反应机理以及反应前后对复合材料的相组成、微观组织、界面结构和力学性能的影响。结果表明:BNNSs与Al混合粉末在630℃放电等离子烧结致密化后,BNNSs与Al并未发生反应。基于此,将烧结坯体在不同温度下进行了热处理,随着热处理温度的升高,B、N原子在Al基体中的扩散速率加快,使得BNNSs与Al的反应进程加剧。经过反应后,基体界面及晶界处弥散分布的AlB_2、AlN能够有效提高复合材料的综合性能。在750℃热处理后,复合材料的抗拉强度、屈服强度、伸长率和导电率分别达到166 MPa、131 MPa、20.4%和50.9%IACS;并且当Al与BNNSs反应充分时,其热导率达到173.4 W·m~(-1)·K~(-1)。

关键词(KeyWords)： 粉末冶金;铝基复合材料;高温热处理;原位反应机理;综合性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51871180)

作者(Author): 杨思尧,李树丰,张鑫,刘磊,潘登,高丽娜,张亚锟,李波

DOI: 10.13289/j.issn.1009-6264.2021-0277

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