快速凝固+热挤压制备TiB_(2)增强铝基复合材料  

TiB_(2) Reinforced Aluminum Matrix Composites Prepared by Rapid Solidification and Hot Extrusion

作　　者：申高亮 相志磊[1] 马小昭 李继豪 黄景存 陈子勇[1] SHEN Gaoliang;XIANG Zhilei;MA Xiaozhao;LI Jihao;HUANG Jingcun;CHEN Ziyong(College of Materials Science and Engineering,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料与制造学部材料科学与工程学院,北京100124

出　　处：《北京工业大学学报》2024年第1期1-9,共9页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51871006)。

摘　　要：为了避免传统铸锭的组织粗大与微观偏析影响材料强度的提升,采用快速凝固单辊熔体旋转法制备5%TiB_(2)增强Al-Zn-Mg-Cu-Zr-Er复合材料薄带,其中TiB_(2)颗粒的质量分数为5%,在380~440℃温度下进行热力挤压获得复合材料棒材,通过X射线衍射、扫描电镜、拉伸测试等分析手段研究TiB_(2)增强铝基复合材料显微组织与力学性能。结果表明:快速凝固能明显细化复合材料晶粒,组织均匀,制备的TiB_(2)增强复合材料带材晶粒尺寸为4~6μm;细晶复合材料带材经热挤压得到棒材,TiB_(2)颗粒均匀分布;随挤压温度升高,复合材料棒材抗拉强度从381 MPa提升到445 MPa,晶粒有所长大。综合考虑,挤压温度420℃、保温30 min为最佳快速凝固+热挤压制备复合材料工艺参数。快速凝固技术在铝基复合材料晶粒细化方面有很大潜力。To avoid the coarse microstructures and micro-segregation of traditional ingots affecting the improvement of material strength,a rapid solidification single-roll melt rotation method was used to prepare 5%TiB_2/Al-Zn-Mg-Cu-Zr-Er composite material ribbons,composite bars were obtained by hot extrusion at 380-440 ℃,and the microstructures and mechanical properties of TiB_(2) reinforced aluminum matrix composites were studied by X-ray diffraction,scanning electron microscopy,tensile testing and other analytical methods.Results show that rapid solidification can significantly refine composite grains,microstructure uniformity,the grain size of the prepared TiB_(2) reinforced composite ribbons are 4-6 μm;fine-grained composite ribbons are hot extruded to obtain bars,and TiB_(2) particles are uniformly distributed.As the extrusion temperatures increase,the tensile strength of composite bars increases from 381 MPa to 445 MPa,and the grains have grown.The extrusion temperature of 420 ℃ for 30 min is the best rapid solidification and hot extrusion process parameter for preparing composites.Rapid solidification technology has great potential for grain refinement of aluminum matrix composites.

关 键 词：快速凝固 热挤压 TiB_(2)颗粒 复合材料 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]