(TiH<sub>2</sub>+TiB<sub>2</sub>)/AA7075复合粉末激光选区熔化成形的显微组织与力学性能

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Abstract 0.6%-1.4% submicron TiH₂ and 0.8% nano-TiB₂ particles (mass fraction, the same as below) were added into AA7075 powders, low-energy ball milled (TiH₂+TiB₂)/AA7075 composite powders were used to fabricate composites by selective laser melting (SLM). Microstructures and mechanical properties of SLMed composites with different TiH₂additive amounts were studied. The results show that the addition of submicron TiH₂ and nano-TiB₂ particles can significantly inhibit the cracks of SLMed AA7075 composites. The cracks can be completely eliminated when 1.4%TiH₂ and 0.8%TiB₂are added. When the TiH₂ additive amount increases from 0.6% to 1.4%, columnar grains in the microstructure are all transformed into equiaxed grains, and the average grain size is refined to 1.38 μm from 2.33 μm. When the TiH₂ additive amount is 1.4%, the tensile strength, yield strength and elongation of the AA7075 composites are 360 MPa, 328 MPa and 12.0%, respectively. After T6 heat treatment, the properties are further improved. The tensile strength and yield strength increase to 461 MPa and 394 MPa, respectively, and the elongation increases to 15.3%.

Key words： 7075 alloy TiH₂ TiB₂ selective laser melting microstructure mechanical property

Received: 04 January 2020 Published: 11 August 2020

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	OUYANG Sheng
	LIU Yunzhong
	SHEN Junjian
	XIAO Xiaojun

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OUYANG Sheng,LIU Yunzhong,SHEN Junjian, et al. Microstructure and mechanical properties of selective laser melting of (TiH₂+TiB₂)/AA7075 composite powders[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 197-205.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I3/197

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