原位自生(Y<sub>2</sub>O<sub>3</sub>+TiB)/Ti-6Al-4V复合材料的组织与力学性能

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Abstract The rare earth compound YB₄ was added into Ti-6Al-4V alloy fabricated using Ti and Al-40V alloy powders as raw materials to prepare in-situ (Y₂O₃+TiB)/Ti-6Al-4V composites by the high temperature thermal decomposition reaction of YB₄ with titanium matrix. The effects of the amount of YB₄addition on the microstructure and mechanical properties of the composite were studied. The microstructures and phase compositions of the composites were analyzed by X-ray diffractometer (XRD), SEM and EPMA. The mechanical properties of materials were tested by electronic stretcher. The results show that the YB₄ reacts with titanium matrix and in-situ generate Y₂O₃ particles and TiB whiskers. With increasing YB₄ additive amount, Y₂O₃ particles gradually agglomerate and TiB whiskers grow. The minor content of YB₄ in (Y₂O₃+TiB)/Ti-6Al-4V composites can slightly increase the tensile strength and significantly improve the elongation. In-situ synthesized (TiB+Y₂O₃)/Ti-6Al-4V composites achieved both high tensile strength (924.0 MPa) and high tensile ductility (9.13%) with adding mass fraction of 0.263% YB₄ powder.

Key words： in-situ synthesis titanium matrix composites rare earth elements YB₄ microstructure mechanical properties

Received: 12 April 2018 Published: 19 July 2019

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	HU Jun
	LIU Huiqun
	WANG Bin
	YI Danqing
	TIAN Yu
	WANG Nanhai

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HU Jun,LIU Huiqun,WANG Bin, et al. Microstructure and mechanical properties of in-situ (Y₂O₃+TiB)/Ti-6Al-4V composites[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 632-639.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I6/632

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