原位网状结构增强(TiB+La_(2)O_(3))/TA19复合材料组织与力学性能研究  

Microstructure and Mechanical Properties of In-Situ Network Structure Rein⁃forced(TiB+La_(2)O_(3))/TA19 Composites

作　　者：姚富升 脱锦鹏 陈安琦 李响 孙国栋 董龙龙 YAO Fusheng;TUO Jinpeng;CHEN Anqi;LI Xiang;SUN Guodong;DONG Longong(School of Materials and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Materials Science and Engineering,Shanghai University of Technology,Shanghai 200093,China;North-west Research Institute of Nonferrous Metals,Xi'an 710016,China;Xi'an Rare Metal Materials Research Institute,Xi'an 710016,China)

机构地区：[1]江苏科技大学材料与工程学院,江苏镇江212003 [2]上海理工大学材料科学与工程学院,上海200093 [3]西北有色金属研究院,陕西西安710016 [4]西安稀有金属材料研究院有限公司,陕西西安710016

出　　处：《铜业工程》2023年第6期21-30,共10页Copper Engineering

基　　金：国家自然科学基金项目(52271138);陕西省重点研发计划一般项目(2023-YBGY-433);陕西省重点研发计划一般项目(2021SF-296)资助。

摘　　要：采用球磨和放电等离子烧结(SPS)技术制备出增强相呈网状结构分布的(TiB+La_(2)O_(3))/TA19复合材料。利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)等手段对复合粉末和复合材料的微观组织、物相结构和断口特性进行表征分析,通过万能试验机测试了复合材料的室温和高温力学性能。结果表明:LaB_(6)颗粒的加入可以明显提高材料的抗拉强度。随着增强体含量的增加,复合材料的组织由魏氏组织向等网篮状组织转变;烧结后晶粒得到细化,力学性能得到提高。随着增强体含量的提高,复合材料的室温抗拉强度不断提高,延伸率下降。当LaB_(6)的质量分数为0.2%时,复合材料的延伸率最好,为17.5%;当LaB_(6)的质量分数为0.5%时,复合材料的抗拉强度最高,为1288MPa,比基体合金提高了13.70%。强化机制主要为细晶强化和增强体的承载载荷的作用。在650℃时,复合材料的强度随着LaB_(6)含量的提高而上升,当增强体质量分数为0.5%时,抗拉强度最高可达607MPa,比TA19钛合金基体提高了10.31%。强化机制主要为增强体的载荷传递。本文研究了不同含量增强体的钛基复合材料在室温及高温下的力学性能,为钛基复合材料在高温性能上的应用提供了理论依据。In this paper,(TiB+La_(2)O_(3))/TA19 composites with reinforcing phases showing a reticulated distribution were prepared by ball milling and discharge plasma sintering techniques.The microstructure,physical phase structure and fracture properties of the compos‐ite powder and composites were characterized and analyzed by means of scanning electron microscope(SEM)and X-ray diffractometer(XRD),and the room temperature and high temperature mechanical properties of the composites were tested by universal testing ma‐chine.The results showed that the addition of LaB_(6) particles could significantly improve the tensile strength of the material.With the in‐crease of the content of reinforcement,the organization of the composite material changed from Weissian to Isonet basket-like organiza‐tion;the grain was refined after sintering,and the mechanical properties were improved.The room temperature tensile strength of the composites continued to increase with the increase of the reinforcement content,and the elongation decreased.When the mass fraction of LaB_(6) was 0.2%,the elongation of the composite material was the best(17.5%);when the mass fraction of LaB_(6) was 0.5%,the tensile strength of the composite material was the highest(1288 MPa),which was 13.70%higher than that of the matrix alloy.The strengthen‐ing mechanism was mainly the role of fine crystal strengthening and load bearing of the reinforcement.At 650℃,the strength of the composites increased with the increase of the content of LaB_(6),and when the mass fraction of the reinforcement was 0.5%,the compos‐ites had the highest tensile strength of 607 MPa,which was 10.31%higher than that of TA19 titanium alloy matrix.The strengthening mechanism was mainly the load transfer of the reinforcement.This study was of great significance for the study of room and high temper‐ature mechanical properties of titanium matrix composites with different contents of reinforcements.

关 键 词：放电等离子烧结 钛基复合材料 LaB_(6) 力学性能 网状结构 

分 类 号：TF813[冶金工程—有色金属冶金] TF804.2