粉末冶金技术2024，Vol.42Issue(2)：135-143,9.DOI:10.19591/j.cnki.cn11-1974/tf.2022010002
低成本TiH2粉末制备Ti/(TiB+TiC)复合材料的组织与性能
Microstructure and properties of Ti/(TiB+TiC)composites prepared by low-cost TiH2 powders
摘要
Abstract
Ti/(TiB+TiC)titanium matrix composites with the excellent mechanical properties were prepared by vacuum pressureless sintering and hot extrusion by using low-cost TiH2 powders instead of pure titanium powders and adding B4C to in-situ produce TiB and TiC reinforcements.The effects of preparation technology and reinforcements on the microstructure and properties of the Ti/(TiB+TiC)composites were analyzed.The results show that the TiH2 powders have the good sintering activity,and the relative density of the sample after dehydrogenation and sintering can reach 97.7%,which is further increased to 99.9%after the hot extrusion as closed to full density.The TiB reinforcements are short fibrous,and the TiC reinforcements are granular,which are uniformly distributed in the equiaxed α-Ti matrix,restraining the growth of equiaxed grains and refining the grains.The hot extrusion process can further refine the grains and make the microstructure more uniform and compact,the as-extruded titanium matrix composites show the high hardness and good matching of strength and ductility.The TiH2+4%B4C(volume fraction)extruded composites have the Vickers hardness of Hv0.3 310,yield strength of 683 MPa,tensile strength of 851 MPa,and elongation of 15.1%after fracture.关键词
TiH2粉末/钛基复合材料/热挤压/显微组织/力学性能Key words
TiH2 powders/titanium matrix composites/hot extrusion/microstructure/mechanical properties分类
矿业与冶金引用本文复制引用
林东键,柳中强,唐浩,张建涛,肖志瑜..低成本TiH2粉末制备Ti/(TiB+TiC)复合材料的组织与性能[J].粉末冶金技术,2024,42(2):135-143,9.基金项目
国家自然科学基金资助项目(52274363),广东省自然科学基金资助项目(2015A030312003) （52274363）
