Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455171 | Materials Science and Engineering: A | 2017 | 11 Pages |
Abstract
Laser remelting was employed to refine the interlamellar spacing (λ) to approximately 30 nm on an arc-cast Al-32.7 wt%Cu eutectic. λ scaled with A â²(h)-°0.25 where h is the distance from the trace bottom, and A â² is a factor dependent on laser processing conditions. Aâ² increased with the laser power (at a constant spot diameter) but decreased with the spot diameter (at a constant laser power). The nanoindentation measured hardness increased up to 4.68 GPa with decreasing interlamellar spacing, following the Hall-Petch relation. The as-cast eutectics showed microcracks around indents, while cracking was suppressed in the laser remelted nanoscale eutectics. A dislocation theory based mechanism is proposed for the enhanced plastic co-deformation of fine scale laser-remelted Al-Al2Cu eutectics.
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Materials Science
Materials Science (General)
Authors
Qian Lei, Bhupendera Prashanth Ramakrishnan, Shujuan Wang, Yichen Wang, Jyotirmoy Mazumder, Amit Misra,