高强韧抗疲劳TiB_(2)/7050Al复合材料组织与性能研究  

Microstructures and Mechanical Properties of TiB_(2)/7050Al Composites With High Tensile Strength,Good Ductility,and Fatigue Resistance

作　　者：刘钧 刘长志 鄢东洋 陈哲 王浩伟[1] LIU Jun;LIU Changzhi;YAN Dongyang;CHEN Zhe;WANG Haowei(School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240;Beijing Institute of Astronautical Systems Engineering,Beijing 100076)

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]北京宇航系统工程研究所,北京100076

出　　处：《宇航材料工艺》2024年第2期119-124,共6页Aerospace Materials & Technology

基　　金：国家自然科学基金资助(52101179,52101043,51971137)。

摘　　要：原位自生铝基复合材料具备轻质、高模量和高强度,是实现装备结构轻量化的关键材料之一。塑性加工变形量是决定铝基复合材料组织和性能的重要因素。本文以三种典型截面规格型材为载体,研究了挤压变形量对热挤压制备Ti B_(2)/7050Al复合材料组织结构与力学性能的影响规律与作用机制。采用扫描电子显微镜与背散射电子衍射技术,分析了复合材料内颗粒分布与三维晶粒结构,及其与挤压变形量的演化规律,讨论了复合材料不同组织结构下的室温拉伸性能与抗疲劳性能。结果表明:Ti B_(2)/7050Al复合材料型材同时具备高弹性模量(78~84 GPa)、高强塑积(6588 MPa·%)与高疲劳极限(289 MPa),将在航空航天等领域具有广泛的应用前景。In-situ nanoparticles reinforced Al matrix composites had low density,high modulus and high strength,making them one of the key materials for achieving lightweight equipment structure.The amount of plastic deformation during processing is an important factor determinging the microstructure and properties of aluminum matrix composites.Scanning electron microscopy and backscattered electron diffraction techniques were used to analyze the particle distribution and three-dimensional grain structure in composites,as well as the evolution law with extrusion deformation.The room temperature tensile performance and fatigue resistance of composite materials under different organizational structures were discussed.The results show that TiB_(2)/7050Al composite have high elastic modulus(78-84 GPa),high plastic yield(6588 MPa·%),and high fatigue limit(289 MPa),and will have broad application prospects in aerospace and other fields.

关 键 词：陶瓷颗粒 铝基复合材料 强度 塑性 疲劳极限 

分 类 号：TB331[一般工业技术—材料科学与工程]