刘炳义,汪振华,罗跃,方群兵,王跃

• 1:南京理工大学机械工程学院

摘要(Abstract)：

首先采用超声波震荡和机械球磨的方法将碳纳米管(CNTs)粉末和Ti-48Al-2Cr-8Nb(原子分数,%)预合金粉末制备成混合粉末,随后通过放电等离子烧结技术(SPS)制备了CNTs/Ti-48Al-2Cr-8Nb复合材料,研究了CNTs含量对复合材料的相组成、微观组织和室温力学性能的影响。结果表明:随着CNTs含量的增加,反应生成的TiC和Ti_2AlC碳化物的含量会增加,而TiC、Ti_2AlC相可以细化晶粒尺寸,起到细晶强化作用,同时TiC、Ti_2AlC相作为硬质陶瓷相也可以起到强化作用;当CNTs含量为0.4%时,复合材料的平均晶粒尺寸由60μm细化到32μm,密度、硬度和抗弯强度分别为4.294 g/cm~3、377 HV20和879 MPa,断裂模式主要为穿晶断裂;当CNTs含量较多时,由于CNTs分散不均匀,反应生成的碳化物会发生团聚现象,造成复合材料会产生凹坑、裂纹等缺陷,降低其室温力学性能。

关键词(KeyWords)： TiAl基合金;CNTs;放电等离子烧结;微观组织;室温力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51775280)

作者(Author): 刘炳义,汪振华,罗跃,方群兵,王跃

DOI: 10.13289/j.issn.1009-6264.2021-0315

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