Microstructures and tensile properties of a selective laser melted Al–Zn–Mg–Cu (Al7075) alloy by Si and Zr microalloying
By Lanbo Li, Rui-di Li, Tiechui Yuan, Chao Chen, Zhijian Zhang, Xiaofen Li. Materials Science & Engineering: A, 2020
154 citations recorded by the source corpus.
Abstract The application of conventional Al–Zn–Mg–Cu alloys for selective laser melting (SLM) of additive manufacturing is hindered by hot cracking during the SLM process. In the present work, a novel Si- and Zr-modified Al–Zn–Mg–Cu (Al7075) prealloyed powder was developed for SLM, and the printability, microstructure, and mechanical properties of the as-built samples were evaluated at various laser powers. The as-built samples are completely crack-free at various laser powers, showing that Si and Zr effectively prevent hot cracking for SLM printed Al–Zn–Mg–Cu. The mechanisms of tensile property enhancement are as follows: first, the low melting point Si-rich eutectics backfill the cracks; second, the Al3Zr significantly decreases the grain sizes. The microstructure has a bipolar grain distribution with fine grains at the bottom of the melt pool (2–5 μm) and coarse columnar grains (10–30 μm) at the top of the melt pool. The synergistic effect of the Si and Zr contribute to outstanding tensile properties (446 MPa tensile strength and 6.5 % elongation), which are higher than those for SLM printed Al–Zn–Mg–Cu alloys without the addition of Si and Zr.
Subfields: Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/1843e5ed7c5fe8bfd08bd949cd0ce1f71e09a08b
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Automotive Engineering
In Mechanical Engineering
Citations in the corpus
- A Novel Strategy to Additively Manufacture 7075 Aluminium Alloy With Selective Laser Melting (2021, background): “It is noteworthy that the mechanical properties of the previously reported SLM-fabricated 7075 alloys relied on the addition of large amounts of nucleants and/or solute elements, which either led to embrittlement or composition deviation from the standard [20-23, 55, 56].”