TiC/Ti层状复合材料组织与力学性能研究  

Microstructure and Mechanical Properties of TiC/Ti Composites with Laminated Structure

作　　者：吴昊 张龙 于佳石 霍望图 陈昊 Wu Hao;Zhang Long;Yu Jiashi;Huo Wangtu;Chen Hao(Xi’an Noble Rare Metal Materials Co.,Ltd,Xi’an 710201,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]西安诺博尔稀贵金属材料股份有限公司,陕西西安710201 [2]西北有色金属研究院,陕西西安710016 [3]东北大学材料科学与工程学院,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2023年第6期2205-2211,共7页Rare Metal Materials and Engineering

基　　金：陕西省重点研发计划(2020GY-292);陕西省自然科学基础研究计划(2022KJXX-82)。

摘　　要：为了平衡钛基复合材料(titanium matrix composites,TMCs)的强度和延展性,通过电泳沉积将氧化石墨烯(graphene oxides,GOs)沉积到Ti箔表面,然后进行放电等离子烧结(spark plasma sintering,SPS)制备了具有层状结构的原位TiC/Ti复合材料,并对复合材料进行冷轧和退火处理从而进一步优化复合材料的综合力学性能。结果表明,烧结过程中,Ti箔表面的GOs与Ti基体反应形成了原位TiC,从而形成了TiC/Ti层状复合材料,随着沉积时间的增加,分布在Ti层之间的TiC的含量增加;复合材料经过冷轧和退火后,退火态材料的晶粒为等轴晶,且TiC仍然保持层状分布特征。沉积时间120 s时,烧结态材料的抗拉强度(UTS)为555 MPa,伸长率(δ)为15%;退火态材料的抗拉强度为568 MPa,伸长率为27%,相比于烧结态材料,退火态材料达到了较好的强塑性匹配。此外,基于微观组织及断裂行为的分析对复合材料的强韧化机制进行了讨论。In order to balance the strength and ductility of titanium matrix composites(TMCs),the graphene oxides(GOs)were electrophoretic-ally deposited on pure Ti foils,then the deposited Ti foils were treated by spark plasma sintering(SPS)process,and finally the in-situ TiC/Ti composites with layered structures were obtained.In order to further ameliorate the comprehensive mechanical properties,the sintered composites were subjected to cold rolling and annealing.Results show that GOs on the Ti foil surface reacts with Ti matrix to form the in-situ TiC phases during sintering process,thus forming TiC/Ti layered composites.With increasing the deposition duration,the content of TiC distributed between Ti layers is increased.After cold rolling and annealing,the grains of annealed composites are equiaxed,and the TiC still presents the layered distribution characteristic.When the deposition duration is 120 s,the ultimate tensile strength(UTS)and the elongation(δ)of sintered material are 555 MPa and 15%,respectively;UTS andδof annealed material are 568 MPa and 27%,respectively.Compared with the sintered materials,the annealed material achieves good strength-plasticity synergy.In addition,the strengthening and toughening mechanisms of composites were discussed based on the analysis of microstructure and fracture behavior.

关 键 词：钛基复合材料 层状结构 力学性能 显微组织 

分 类 号：TB333[一般工业技术—材料科学与工程]