王维,艾桃桃,冯小明,李文虎,蒋鹏,袁新强,孛海娃,景然

• 1:陕西理工大学材料科学与工程学院

摘要(Abstract)：

以Ti-Al-Ti_3AlC_2为反应体系,采用真空热压技术(1100℃×1 h)制备Ti_2AlC/TiAl基复合材料。借助XRD、SEM等测试手段分析相组成以及微观结构,并测量其密度、维氏硬度、抗弯强度、抗压强度和断裂韧性等室温力学性能。结果表明,产物主要由TiAl、Ti_2AlC和Ti_3Al相组成。利用Ti_3AlC_2分解反应原位自生的Ti_2AlC增强相主要分布于基体晶界处,部分钉扎于晶内,且随着Ti_2AlC生成量的增大,团聚现象加剧。室温力学性能测试表明,Ti_2AlC/TiAl基复合材料的力学性能明显优于单相TiAl材料,当Ti_3AlC_2掺杂量为10 mass%时,综合性能较好,密度、硬度、抗弯强度、抗压强度和断裂韧性分别为3.97 g/cm~3、4.82 GPa、488.61 MPa、1340 MPa和5.68 MPa·m~(1/2)。断裂机制主要表现为沿晶断裂、穿晶断裂、裂纹偏转与桥联;颗粒相增韧、裂纹偏转与桥联以及层状增韧是主要的增韧方式。

关键词(KeyWords)： Ti_2AlC/TiAl基复合材料;微观结构;力学性能;断裂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(51671116);; 陕西省自然科学基础研究计划重点项目(2016JZ016);; 陕西省教育厅自然科学重点科学研究计划项目(16JS018);; 陕西省青年科技新星科技计划项目(2014KJXX-75);; 陕西理工大学科研计划项目(SLGQD16-04)

作者(Author): 王维,艾桃桃,冯小明,李文虎,蒋鹏,袁新强,孛海娃,景然

DOI: 10.13289/j.issn.1009-6264.2017.03.002

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