龙文元,陈勤,刘伟国

• 1:南昌航空大学航空制造工程学院

摘要(Abstract)：

采用原位合成Al-K_2TiF_6-KBF_4熔盐体系,通过熔体反应法成功制备了颗粒增强铝基复合材料。采用扫描电镜、X射线衍射(XRD)、万能力学试验机及摩擦磨损试验等研究了高能超声时间对复合材料的组织、力学性能和摩擦磨损性能的影响。结果表明:复合材料中存在TiB_2颗粒和少量Al_3Ti颗粒,颗粒大小为1～2μm, TB_2颗粒的截面形貌接近于正六边形,且在基体中均匀分布。复合材料的抗拉强度和伸长率随着超声处理时间的增加而提高。当超声时间为4 min时,复合材料的抗拉强度和伸长率达到最大值,分别为172 MPa和11.1%,比A356母合金分别提高了20.3%和126%,断裂模式也从准解理断裂转为韧性断裂,耐磨性也相对最好,摩擦系数达到最小值0.44,磨损量为-0.5 mg。

关键词(KeyWords)： 熔体反应法;超声振动;颗粒增强;铝基复合材料

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51165036);; 南昌航空大学研究生创新基金(YC2016007)

作者(Author): 龙文元,陈勤,刘伟国

DOI: 10.13289/j.issn.1009-6264.2020-0362

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