激光选区熔化成形ZrH<sub>2</sub>/6060铝合金的显微组织与力学性能

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Abstract The 6060+1%ZrH₂ composite powder was prepared by short-time low energy ball milling with 1% (mass fraction ,the same as below) submicron ZrH₂ powder added into 6060 aluminum alloy atomized powder. Then 6060 aluminium alloy containing zirconium was prepared by Selective laser melting (SLM) forming process. The microstructures and mechanical properties of 6060 aluminium alloy were analyzed and tested with different SLM process conditions. The effects of ZrH₂ addition on the microstructures and mechanical properties of 6060 aluminium alloy were studied. The results show that the density of 6060 aluminium alloy increases from 93.8% to 97.8% after adding 1% submicron ZrH₂, and the cracking of formed sample is restrained. The surface spheroidization phenomenon is weakened, the surface quality is remarkably improved, the surface is smooth, and there are no large pores and other defects. The grain size of the formed sample is significantly refined from 56 μm to 3 μm. Compared with 6060 aluminum alloy without sub-micron addition of ZrH₂, the tensile strength, yield strength, elongation and micro-hardness of AA6060+Zr specimens increase by 26.0%, 73.0%, 126.8% and 21.8% respectively.

Key words： selective laser melting 6060 aluminum alloy ZrH₂ microstructure mechanical property

Received: 21 February 2019 Published: 12 July 2019

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TG146.2⁺1

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	TU Cheng
	LIU Yunzhong
	HU Liang
	ZHOU Zhiguang

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TU Cheng,LIU Yunzhong,HU Liang, et al. Microstructures and mechanical properties of ZrH₂/6060 aluminum alloy fabricated by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 349-357.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I4/349

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