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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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

Received: 19 November 2020 Published: 07 May 2021

ZTFLH:	TF125.2
	TG146.4

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	Articles by authors
	KANG Jun
	LIN Zehua
	ZHOU Yonggui
	LIU Fangzhou
	ZHOU Chengshang
	YAN Wenmin

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KANG Jun,LIN Zehua,ZHOU Yonggui, et al. Effect of nano-Y₂O₃ on microstructure and properties of 97W-2Ni-Fe tungsten alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2021, 26(2): 117-124.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2021/V26/I2/117

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