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Effect of Thermomechanical Processing on Fatigue Behavior in Solid-State Additive Manufacturing of Al‐Mg‐Si Alloy
| Content Provider | MDPI |
|---|---|
| Author | Rutherford, Ben A. Avery, Dustin Z. Phillips, Brandon J. Rao, Harish M. Doherty, Kevin J. Allison, Paul G. Brewer, Luke N. Jordon, J. Brian |
| Copyright Year | 2020 |
| Description | This work presents, for the first time, an in-depth investigation of the structure–property–fatigue relationships of an Al-Mg-Si alloy (AA6061) processed via additive friction stir-deposition (AFS-D). As industry focus continues to shift for more efficient and lightweight structures, quantitative studies on the cyclic performance of additively manufactured materials are needed. In this study, the AFS-D processed AA6061-T6 was machined into specimens in two orthogonal orientations and subjected to monotonic and strain-controlled fatigue testing. The microstructural features of as-deposited AA6061 exhibited evidence of dynamic recrystallization and grain refinement. In addition, significant reduction in the intermetallic particles was observed after AFS-D processing. The fatigue results demonstrate that the as-deposited material, particularly the longitudinal direction, exhibited similar fatigue performance to wrought AA6061-T6 in both low-cycle and high-cycle fatigue regimes, which is a promising result for additively manufactured material in the as-deposited condition. By contrast, the as-deposited build direction orientation possessed slightly lower fatigue resistance than the wrought feedstock material. The AFS-D material was observed to exhibit different damage mechanisms from porosity-based damage mechanisms observed in fusion-based additively manufactured materials. Lastly, a microstructure-sensitive fatigue model was employed to capture the fatigue effects of the AFS-D processing on the AA6061. |
| Starting Page | 947 |
| e-ISSN | 20754701 |
| DOI | 10.3390/met10070947 |
| Journal | Metals |
| Issue Number | 7 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-07-14 |
| Access Restriction | Open |
| Subject Keyword | Metals Applied Chemistry Fatigue Additive Manufacturing Fractography Aluminum Alloy Sem |
| Content Type | Text |
| Resource Type | Article |
