Developing a high-strength Al-Mg-Si-Sc-Zr alloy for selective laser melting: Crack-inhibiting and multiple strengthening mechanisms
By Rui-di Li, Minbo Wang, Zhiming Li, Peng Cao, Tiechui Yuan, Hongbin Zhu. 2020
511 citations recorded by the source corpus.
Abstract To develop high-strength Al alloys for selective laser melting (SLM) additive manufacturing, we designed a series of Al-Mg(-Si)-Sc-Zr alloys and additively manufactured them using atomized alloy powders. In the absence of Si, the developed Al-xMg-0.2Sc-0.1Zr (x = 1.5, 3.0 and 6.0 wt%) alloys are all susceptible to hot cracking and the average crack density increases with increasing Mg content. The addition of 1.3 wt% Si into the Al-6Mg-0.2Sc-0.1Zr alloys effectively inhibits hot cracking during SLM and simultaneously refines the microstructure, and thus leading to enhanced mechanical properties in the as-printed samples. By further fine-tuning the alloy compositions, we designed a new alloy Al-8.0Mg-1.3Si-0.5Mn-0.5Sc-0.3Zr. This new alloy demonstrates significantly refined microstructure consisting of submicron cells with coherent Al3(Sc,Zr) nano-particle (2–15 nm) residing in the cell and intergranular Al-Mg2Si eutectic (Mg2Si diameter 10–100 nm). High-density stacking faults and a unique 9R phase are formed in the as-printed sample. The tensile strength and elongation of the as-printed sample are up to 497 MPa and 11%, respectively. After the aging treatment, the tensile strength reaches 550 MPa, while the ductility ranges from 8% to 17%, depending on the aging conditions. In addition to solid solution strengthening, grain boundary strengthening and nanoparticle strengthening, the high-density stacking faults also contributes to strengthening.
Subfields: Aerospace Engineering, Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/8bacb37eec0c77143dc96253ead1bf8cc9bd3386
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Citations in the corpus
- Material-structure-performance integrated laser-metal additive manufacturing (2021, background): “R. D. Li et al., Developing a high-strength Al-Mg-Si-Sc-Zr alloy for selective laser melting: Crack-inhibiting and multiple strengthening mechanisms.”
- Recent advances in hot tearing during casting of aluminium alloys (2020, background): “[115] investigated the hot tearing susceptibility of Al-xMg(-Si)-0.”
- A Novel Strategy to Additively Manufacture 7075 Aluminium Alloy With Selective Laser Melting (2021, background): “The adoption of inoculation treatment into SLM has produced promising results in obtaining highly dense high-strength Al alloys [4, 13, 16-23].”
- Towards high-temperature applications of aluminium alloys enabled by additive manufacturing (2021, background): “3Zr, strengthening by Orowan dislocation looping around Al3(Sc,Zr) and Mg2Si precipitates contributed nearly 30% to the alloy strength [201].”
- A review of Laser Powder Bed Fusion Additive Manufacturing of aluminium alloys: Microstructure and properties (2021, background): “[125][150] studied the alloy Al-xMg-Sc-Zr by varying Mg content from 1.”