Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 840, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.142928
Keywords
Additive manufacturing; Aluminum alloys; Al-Cu-Mn-Zr alloy; Strengthening mechanisms; Strain hardening
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Funding
- U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office and Vehicle Technologies Office's Powertrain Materials Core Program
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The microstructural and strength evolution of an additively manufactured alloy were investigated at different temperatures. The results showed significant changes in the strengthening phases upon aging, indicating the need for specific strengthening models for additively manufactured alloys.
The microstructural and strength evolution of an additively manufactured Al-8.6Cu-0.5Mn-0.9Zr alloy upon aging at 300, 350, and 400? is investigated. The strengthening phases of the alloy evolve significantly upon aging, with breakdown and spheroidization of the interconnected theta'-Al2Cu network, dissolution of metastable theta'-Al2Cu precipitates, and precipitation of nanometric L1(2)-Al3Zr from a matrix supersaturated in Zr. In the peakaged states, the alloy displays a favorable combination of strength and ductility, with a room-temperature yield strength of 314-341 MPa and ductility of 11-13%. The measured yield strengths for microstructures with different aging treatments are compared to predictions of yield strengths from grain boundary, solid solution, and particle strengthening contributions. The observed strain hardening behavior is related to fundamental precipitate and dislocation interactions. Comparison between predicted and measured strength values indicates a continued need for strengthening models specifically developed for the heterogeneous microstructures of additively manufactured alloys.
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