崔洪芝,杨开彬,宋晓杰,张国松,程贵勤

• 1:山东科技大学材料科学与工程学院
• 2:山东青州海盾液压机械有限公司

摘要(Abstract)：

以Ni、Al、Ti以及碳纳米管(CNTs)为原料,采用自蔓延高温合成(SHS)方法制备出含CNTs-TiC增强相的NiAl基复合材料;分析复合材料的物相组成、微观结构及成分分布,并探讨微观组织的形成机制。结果表明:合成产物主要为NiAl和TiC及少量未反应的CNTs;在Ni+Al体系中加入少量Ti+CNTs时,CNTs作为碳源和形核中心与Ti原子结合生成TiC颗粒,在CNTs周围形成尺寸细小的TiC颗粒或TiC薄层,当加入的Ti+CNTs含量增加时,TiC颗粒充分长大,呈现八面体或立方体形态,一部分弥散分布在NiAl基体中,一部分在NiAl晶界处团聚;随着Ti+CNTs的加入,NiAl晶粒得到显著细化,原位合成的TiC颗粒增强了复合材料的显微硬度和抗压强度,CNTs作为增强纤维,通过裂纹桥联及纤维拔出等机制强化材料的断裂韧性,CNTs-TiC的复合强化对材料起到增强增韧作用。

关键词(KeyWords)： 原位合成;CNTs纤维;TiC颗粒;复合强化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51272141);; 国家863计划项目(2015AA034404);; 山东省泰山学者计划(TS20110828)

作者(Author): 崔洪芝,杨开彬,宋晓杰,张国松,程贵勤

DOI: 10.13289/j.issn.1009-6264.2016.08.003

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