Developing a high-strength Al–Mg–Si–Sc–Zr alloy for selective laser melting: 
Crack-inhibiting and multiple strengthening mechanisms

Li, Ruidi; Wang, Minbo; Li, Zhiming; Cao, Peng; Yuan, Tiechui; Zhu, Hongbin

doi:10.1016/j.actamat.2020.03.060

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Developing a high-strength Al–Mg–Si–Sc–Zr alloy for selective laser melting: Crack-inhibiting and multiple strengthening mechanisms

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Li, Zhiming
High-Entropy Alloys, Project Groups, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083 China;

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引用

Li, R., Wang, M., Li, Z., Cao, P., Yuan, T., & Zhu, H. (2020). Developing a high-strength Al–Mg–Si–Sc–Zr alloy for selective laser melting: Crack-inhibiting and multiple strengthening mechanisms. Acta Materialia, 193, 83-98. doi:10.1016/j.actamat.2020.03.060.

引用: https://hdl.handle.net/21.11116/0000-0009-6C06-8

要旨

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. © 2020 Acta Materialia Inc.