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Sisco K, Plotkowski A, Yang Y, Leonard D, Stump B, Nandwana P, Dehoff RR, Babu SS. Microstructure and properties of additively manufactured Al-Ce-Mg alloys. Sci Rep 2021; 11:6953. [PMID: 33772051 PMCID: PMC7998028 DOI: 10.1038/s41598-021-86370-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 03/01/2021] [Indexed: 11/17/2022] Open
Abstract
Additive manufacturing of aluminum alloys is largely dominated by a near-eutectic Al-Si compositions, which are highly weldable, but have mechanical properties that are not competitive with conventional wrought Al alloys. In addition, there is a need for new Al alloys with improved high temperature properties and thermal stability for applications in the automotive and aerospace fields. In this work, we considered laser powder bed fusion additive manufacturing of two alloys in the Al–Ce–Mg system, designed as near-eutectic (Al–11Ce–7Mg) and hyper-eutectic (Al–15Ce–9Mg) compositions with respect to the binary L → Al + Al11Ce eutectic reaction. The addition of magnesium is used to promote solid solution strengthening. A custom laser scan pattern was used to reduce the formation of keyhole porosity, which was caused by excessive vaporization due to the high vapor pressure of magnesium. The microstructure and tensile mechanical properties of the alloys were characterized in the as-fabricated condition and following hot isostatic pressing. The two alloys exhibit significant variations in solidification structure morphology. These variations in non-equilibrium solidification structure were rationalized using a combination of thermodynamic and thermal modeling. Both alloys showed higher yield strength than AM Al-10Si-Mg for temperatures up to 350 °C and better strength retention at elevated temperatures than additively manufactured Scalmaloy.
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Affiliation(s)
- K Sisco
- Material Science and Engineering, University of Tennessee-Knoxville, Knoxville, TN, USA.
| | - A Plotkowski
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Y Yang
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - D Leonard
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - B Stump
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - P Nandwana
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - R R Dehoff
- Manufacturing Science Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - S S Babu
- Mechanical, Aerospace and Biomedical Engineering, University of Tennessee-Knoxville, Knoxville, TN, USA
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Meher S, Rojhirunsakool T, Nandwana P, Tiley J, Banerjee R. Determination of solute site occupancies within γ′ precipitates in nickel-base superalloys via orientation-specific atom probe tomography. Ultramicroscopy 2015; 159 Pt 2:272-7. [DOI: 10.1016/j.ultramic.2015.04.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 04/08/2015] [Accepted: 04/23/2015] [Indexed: 10/23/2022]
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