高温轧制W5Re/TZM复合材料的组织及性能  

Microstructural and properties of W5Re/TZM composites subjected to high-temperature rolling

作　　者：周飞扬 张扬英 袁媛[1] 韩超[1] 刘瑛 韩勇[1] ZHOU Feiyang;ZHANG yangying;YUAN Yuan;HAN Chao;LIU Ying;HAN Yong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Zhuji Hongde New Material Co.,Ltd.,Shaoxing 312000,China;Zijin Mining Renewable Energy and Advanced Materials(Changsha)Co.,Ltd.,Changsha 410036,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]诸暨弘德新材料有限公司,绍兴312000 [3]紫金矿业新能源新材料科技(长沙)有限公司,长沙410036

出　　处：《中国有色金属学报》2024年第11期3608-3619,共12页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52371041)。

摘　　要：本文采用烧结法制备了W5Re/TZM复合材料,并通过高温轧制进一步改善其界面结合。通过扫描电镜(SEM)、能谱(EDS)、电子背散射衍射(EBSD)、透射电镜(TEM)和力学实验,重点研究了压下量(25%、40%、55%、70%)对W5Re/TZM复合材料微观组织和力学性能的影响,并分析了复合材料界面协调变形机理。结果表明:随着轧制压下量的增加,W5Re和TZM晶粒显著破碎,最小平均晶粒尺寸分别为13.5μm和15.0μm。在高温轧制过程中,W5Re合金发生了动态回复,TZM合金则发生了动态再结晶,其维氏显微硬度与平均晶粒尺寸d符合Hall-Petch关系。在压下量为40%时,W5Re/TZM复合材料的界面剪切强度达到最高值,为183 MPa,比烧结态提高了60%。在界面元素扩散层内,大量的位错塞积在晶界处。位错的积聚对界面强度的提高起到了重要作用,而界面的协调变形主要通过已有位错滑移来实现。In this paper,W5Re/TZM composites were prepared by sintering,and the interface bonding was further improved by high temperature rolling.The effects of rolling reductions on the microstructure and mechanical properties of alloys were investigated by scanning electron microscope(SEM),energy dispersive spectrometer(EDS),electron back scatter diffraction(EBSD),transmission electron microscope(TEM)and mechanical experiments.The interface co-deformation mechanism of the composite materials was also analyzed.The results show that increasing the rolling reductions significantly refines the grains of W5Re and TZM.The smallest average grain sizes are 13.5μm for W5Re alloy and 15.0μm for TZM alloy.During high-temperature rolling,the W5Re alloy undergoes dynamic recovery,while the TZM alloys experience dynamic recrystallization.The Vickers microhardness of both follow the Hall-Petch relationship with average grain size.At rolling reduction of 40%,the interface shear strength of the W5Re/TZM composites reaches its highest value of 183 MPa(compared with the sintered sample increased by 60%).There is a significant accumulation of dislocations at the grain boundaries within the interfacial diffusion area.The accumulation of dislocations plays an important role in enhancing interfacial strength,while the coordinated deformation of the interface is mainly achieved through dislocation slip.

关 键 词：高温轧制 W5Re合金 TZM合金 复合材料 协调变形 

分 类 号：TF841.1[冶金工程—有色金属冶金]