纳米Y<sub>2</sub>O<sub>3</sub>对97W-2Ni-Fe合金组织与性能的影响

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摘要以W、Ni、Fe元素粉末和纳米Y₂O₃粉末为原料,制备97W-2Ni-1Fe和96.5W-2Ni-Fe-0.5Y₂O₃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Y₂O₃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1 510 ℃(液相)烧结温度下,添加纳米Y₂O₃使钨晶粒尺寸从21.6 μm减小至7.8 μm,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-0.5Y₂O₃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Y₂O₃使得黏结相撕裂的比例增加。

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	康俊
	林泽华
	周永贵
	刘方舟
	周承商
	闫文敏

关键词 ： W-Ni-Fe合金, 纳米Y₂O₃, 显微组织, 力学性能, 断裂形态

Abstract：The 97W-2Ni-Fe and 96.5W-2Ni-Fe-0.5Y₂O₃ alloys were prepared with W, Ni, Fe and nano-Y₂O₃ 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-Y₂O₃ 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 1 510 ℃ (liquid phase), the grain size of tungsten decreases from 21.6 μm to 7.8 μm, 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-0.5Y₂O₃ alloy is tearing of bonding phase and cleavage fracture of a small amount of W grains. The addition of nano-Y₂O₃ increases the tearing ratio of bonding phase.

Key words： W-Ni-Fe alloy nano-Y₂O₃ microstructure mechanical property fracture morphology

收稿日期: 2020-11-19 出版日期: 2021-05-07

ZTFLH:	TF125.2
	TG146.4

基金资助:瞬态冲击技术重点实验室基金资助项目(6142606183209)

引用本文:

康俊, 林泽华, 周永贵, 刘方舟, 周承商, 闫文敏. 纳米Y₂O₃对97W-2Ni-Fe合金组织与性能的影响[J]. 粉末冶金材料科学与工程, 2021, 26(2): 117-124.
KANG Jun, LIN Zehua, ZHOU Yonggui, LIU Fangzhou, ZHOU Chengshang, YAN Wenmin. Effect of nano-Y₂O₃ on microstructure and properties of 97W-2Ni-Fe tungsten alloy. Materials Science and Engineering of Powder Metallurgy, 2021, 26(2): 117-124.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I2/117

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