Microstructures and mechanical properties of Zr modified Al-Cu-Mg alloy processed by selective laser melting

被引：0
|
作者：
Wang K.-D. [1 ]
Liu Y.-Z. [1 ]
Cheng W. [1 ]
Liu X.-H. [1 ]
Zhou Z.-G. [1 ]
机构：
[1] National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 08期
关键词：
Al-Cu-Mg alloy; Al[!sub]3[!/sub]Zr; Mechanical properties; Microstructure; Selective laser melting;
D O I：
10.11817/j.ysxb.1004.0609.2021-40080
中图分类号：
学科分类号：
摘要：
Zr-modified Al-Cu-Mg alloy was processed by selective laser melting (SLM) technique. The microstructures and mechanical properties of as-deposited and heat-treated(T6) samples were systematically analyzed. The results show that samples with the highest density can be achieved when the energy density is 370 J/mm3. The in-situ formed Al3Zr refines the grain size to 1.28 μm and therefore eliminates the common hot tearing in SLMed Al-Cu-Mg alloys. The metastable phase of Al3Zr (L12-Al3Zr) with a size range of from 50 nm to 300 nm is observed, which is responsible for the grain refinement. L12-Al3Zr particles act as the nucleus of heterogenous nucleation of α(Al) due to their minimal mismatch. Besides, the L12-Al3Zr particles can further refine the grains by hindering the migration of grain boundaries. The ultimate strength of (369±9) MPa and the elongation of (12.4±0.6)% are achieved for the as-deposited samples after process parameter optimization. After T6 heat treatment, the ultimate strength greatly increases to (485.2±10) MPa with a slight decrease in plasticity (elongation of (11.2±0.5)%). The strength enhancements of the as-deposited and heat-treated samples can be mainly attributed to the Hall-Petch strengthening and the Orowan strengthening mechanisms, respectively. © 2021, China Science Publishing & Media Ltd. All right reserved.
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页码：2069 / 2080
页数：11
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