TiC粒度及分散性对Mo合金组织与抗拉强度的影响

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Abstract Two Mo-TiC alloys with TiC mass fraction of 6% were prepared by powder metallurgy using ultrafine TiC powder with a particle size of 0.5 μm and a nanometer TiC powder with a particle size of 0.05 μm as raw materials. The effects of particle size and dispersion of TiC on the microstructures and tensile strength of Mo-TiC alloys were studied. The results show that, compared to the addition of ultrafine TiC powder, the addition of nanometer TiC powder has a significant improvement on the tensile strength of the alloy, but because the agglomeration of nano TiC powder in the matrix. When sintered at 1 950 ℃, the tensile strength of Mo-nano TiC alloy reaches 515 MPa, which is more than 30% higher than that of Moultrafine TiC alloy. After adding organic compound as a dispersant, the TiC aggregates in the Mo base are transformed from the spheroid to elongated shape, and some of the nanoscale TiC are fully dispersed the alloy grain is further refined and the strength of the alloy is improved. The tensile strength of the material sintered at 1 850 ℃ reaches 615 MPa.

Key words： Mo-TiC alloy TiC granularity agglomeration organic dispersant tensile strength

Received: 28 March 2018 Published: 19 July 2019

ZTFLH:

TG146.412

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	CHEN Jiyong
	FAN Jinlian
	CHENG Huichao

Cite this article:

CHEN Jiyong,FAN Jinlian,CHENG Huichao. Effects of particle size and dispersion of TiC on the microstructure and tensile strength of Mo alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(6): 614-618.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I6/614

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