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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摘要在6060铝合金雾化粉末中加入1%(质量分数,下同)的亚微米级ZrH₂粉末,经过低能球磨制备1%ZrH₂/AA6060复合粉,然后采用SLM(selective laser melting,激光选区熔化)成形工艺制备含锆的6060铝合金,表征和测试不同SLM工艺条件下合金的显微组织与力学性能,研究添加ZrH₂对6060铝合金显微组织与力学性能的影响。结果表明：添加1%亚微米级ZrH₂后,6060铝合金的致密度由93.8%提高至97.8%,成形试样开裂得到抑制,表面球化现象减弱,表面质量显著提高,表面平整,未出现较大孔洞等缺陷;材料的晶粒显著细化,尺寸由56 μm减小至3 μm。与6060铝合金相比,含锆铝合金的抗拉强度、屈服强度、伸长率、显微硬度分别提高26.0%,73.0%,126.8%和21.8%。

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	涂诚
	刘允中
	胡亮
	周志光

关键词 ：激光选区熔化, 6060铝合金, ZrH₂, 显微组织, 力学性能

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

收稿日期: 2019-02-21 出版日期: 2019-07-12

ZTFLH:

TG146.2⁺1

基金资助:国家重点研发计划资助项目(2017YFB0305800); 广东省科技计划资助项目(2014B010129002,2016B090913001)

通讯作者: 刘允中,教授,博士。电话：020-87110081;E-mail: yzhliu@scut.edu.cn

引用本文:

涂诚, 刘允中, 胡亮, 周志光. 激光选区熔化成形ZrH₂/6060铝合金的显微组织与力学性能[J]. 粉末冶金材料科学与工程, 2019, 24(4): 349-357.
TU Cheng, LIU Yunzhong, HU Liang, ZHOU Zhiguang. Microstructures and mechanical properties of ZrH₂/6060 aluminum alloy fabricated by selective laser melting. Materials Science and Engineering of Powder Metallurgy, 2019, 24(4): 349-357.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I4/349

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