纳米Y_(2)O_(3) 对97W-2Ni-Fe 合金组织与性能的影响  

Effect of nano-Y_(2)O_(3)on microstructure and properties of 97W-2Ni-Fe tungsten alloy

作　　者：康俊 林泽华 周永贵 刘方舟 周承商[2] 闫文敏 KANG Jun;LIN Zehua;ZHOU Yonggui;LIU Fangzhou;ZHOU Chengshang;YAN Wenmin(Shenzhen Zhuocheng Technology Co.,Ltd.,Shenzhen 518100,China;State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;Key Laboratory of Transient Shock Technology,No.208 Research Institute of China Ordnance Industry,Beijing 102202,China)

机构地区：[1]深圳市注成科技股份有限公司,深圳518100 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]中国兵器工业第208研究所瞬态冲击技术重点实验室,北京102202

出　　处：《粉末冶金材料科学与工程》2021年第2期117-124,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：瞬态冲击技术重点实验室基金资助项目(6142606183209)。

摘　　要：以W、Ni、Fe元素粉末和纳米Y_(2)O_(3)粉末为原料,制备97W-2Ni-1Fe和96.5W-2Ni-Fe-0.5Y_(2)O_(3)钨合金,通过扫描电镜(SEM)、能谱仪(EDS)等手段进行表征,并结合黏结相的面积分数和W晶粒接触度的分析,研究烧结温度与添加纳米Y_(2)O_(3)对高密度钨合金微观组织与力学性能的影响。结果表明:随烧结温度升高,钨合金的晶粒尺寸和力学性能明显增加。在1510℃(液相)烧结温度下,添加纳米Y_(2)O_(3)使钨晶粒尺寸从21.6μm减小至7.8μm,黏结相的面积分数从4.45%增加至5.35%,接触度为0.67,合金力学性能显著提升,抗拉强度达到611 MPa,硬度(HRC)为40.1。96.5W-2Ni-Fe-0.5Y_(2)O_(3)合金的拉伸断裂形态为黏结相的撕裂和少量W晶粒解理断裂,添加纳米Y_(2)O_(3)使得黏结相撕裂的比例增加。The 97W-2Ni-Fe and 96.5W-2Ni-Fe-0.5Y_(2)O_(3)alloys were prepared with W,Ni,Fe and nano-Y_(2)O_(3)powders as raw materials,and characterized by scanning electron microscope(SEM),Energy Dispersive X-ray Spectroscopy(EDS),combined with the analysis of liquid content and contiguity,to explore the influence of sintering temperature and addition of nano-Y_(2)O_(3)powder on the microstructure and mechanical properties of high density tungsten alloy.The results show that with the increase of sintering temperature,the grain size and mechanical properties of tungsten alloy increase obviously.At the sintering temperature of 1510℃(liquid phase),the grain size of tungsten decreases from 21.6μm to 7.8μm,the area fraction of bonding phase increases from 4.45%to 5.35%,and the contact degree is 0.67.The mechanical properties of the alloy are improved significantly.The tensile strength reaches 611 MPa and the hardness(HRC)is 40.1.The tensile fracture morphology of 96.5W-2Ni-Fe-0.5Y_(2)O_(3)alloy is tearing of bonding phase and cleavage fracture of a small amount of W grains.The addition of nano-Y_(2)O_(3)increases the tearing ratio of bonding phase.

关 键 词：W-NI-FE合金 纳米Y_(2)O_(3) 显微组织 力学性能 断裂形态 

分 类 号：TF125.2[冶金工程—粉末冶金] TG146.4[冶金工程—冶金物理化学]