W-Re-HfC合金中第二相粒子的微观结构表征  

Microstructural characterization of second-phase particles in W-Re-HfC alloys

作　　者：刘梦 刘雪山 孙本哲 李榕 宋久鹏 LIU Meng;LIU Xue-shan;SUN Ben-zhe;LI Rong;SONG Jiu-peng(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;China National R&D Center for Tungsten Technology,Xiamen Tungsten Co.Ltd.,Xiamen 361021,China)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819 [2]厦门钨业有限公司中国钨技术开发研究中心,福建厦门361021

出　　处：《沈阳工业大学学报》2022年第4期403-408,共6页Journal of Shenyang University of Technology

基　　金：国家军工装备预研基金项目(2017CL06LYJJ01).

摘　　要：针对航空导弹和空地导弹发动机喷管喉衬材料对超高温难熔金属材料的需求,亟需提升难熔金属钨基合金的室温韧性和高温强度.综合运用X射线衍射仪、透射电子显微镜及其相关分析方法,对W-Re-HfC合金经2120℃一次烧结处理、变形量为81.75%的三道次锻造加工处理与1600~1700℃退火处理后的三类试样中的第二相粒子进行了微观结构分析.结果表明:三种状态合金中均含有HfO_(2)粒子,而仅退火态试样中含有HfC粒子;HfO_(2)与HfO_(2)两类第二相粒子均位于W基体的晶界处,且HfC粒子尺寸普遍小于HfO_(2)粒子,HfC粒子由早期形成的HfO_(2)粒子还原所得.In order to meet the demand of aircraft missile and air-to-ground missile’s engine nozzle throat lining materials for ultra-high temperature refractory metallic materials,it is urgent to improve the room temperature toughness and high temperature strength of refractory metallic tungsten-based alloy.After 2120℃primary sintering,three-pass forging with deformation of 81.75%and 1600℃to 1700℃annealing heat treatment,the microstructures of second-phase particles in three types of W-Re-HfC alloys were studied by X ray diffractometer,transmission electron microscope and related analysis methods.The results show that all three alloys contain HfO_(2) particle and only the annealed sample contains HfC particle.All second-phase particles are located at the grain boundaries of W-matrix,and the size of HfC particle is generally smaller than that of HfO_(2) particle,suggesting that the formation of HfC particle is attributed to the reduction reaction of HfO_(2) particle.

关 键 词：超高温难熔金属 钨基合金 第二相粒子 微观结构 HfO_(2)粒子 HfC粒子 热处理 还原 

分 类 号：TG146.4[一般工业技术—材料科学与工程]