期刊
MATERIALS LETTERS
卷 327, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.matlet.2022.133001
关键词
Additive manufacturing; Metals and alloys; Selective laser melting; Synergistic precipitation; Mechanical properties
资金
- National Key Research and Develop- ment Program of China [2021YFB3704205, 2021YFB3704202]
- General Program of Science and Technology Development Project of Beijing Municipal Education Commission [KM 202110005010]
- Inno- vative Research Group Project of the National Natural Science Fund [51621003]
The Er and Zr modified Al-Mg alloy manufactured by selective laser melting showed improved mechanical properties and strength after aging treatment. The synergistic precipitation of Er and Zr led to the formation of bimodal grain structures, promoting phase evolution in the alloy.
Er and Zr modified Al-Mg alloy was manufactured by selective laser melting. The effect of aging treatment on phase evolution and mechanical properties of alloy has been studied. The results show that bimodal grain structures (2.8 +/- 1.1 mu m) could be obtained, thanks to the Al3Zr primary phases promoting the formation of equiaxed grains (0.8 +/- 0.3 mu m) at the boundary of molten pool. During the aging of 375 degrees C, Al3(Er,Zr) particles with the size of 2-5 nm were produced via synergistic precipitation of Er and Zr, which would greatly improve the strength and reach 510 +/- 9 MPa. At the same time, the Mg-rich phase was dissolved, the Mn-rich phase was precipitated, and dislocations could accelerate the diffusion of solute atoms during the evolution of the phases.
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