Structural refinement and nanomechanical response of laser remelted Al-Al2Cu lamellar eutectic

Laser remelting was employed to refine the interlamellar spacing (λ) to approximately 30nm on an arc-cast Al-32.7wt%Cu eutectic. λ scaled with A ′(h)-°0.25 where h is the distance from the trace bottom, and A ′ is a factor dependent on laser processing conditions. A′ increased with the laser power (...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-10, Vol.706 (C), p.115-125
Main Authors: Lei, Qian, Ramakrishnan, Bhupendera Prashanth, Wang, Shujuan, Wang, Yichen, Mazumder, Jyotirmoy, Misra, Amit
Format: Article
Language:English
Subjects:
Al-Cu alloys
Eutectic alloy
Microstructure
Plasticity
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Summary:Laser remelting was employed to refine the interlamellar spacing (λ) to approximately 30nm on an arc-cast Al-32.7wt%Cu eutectic. λ scaled with A ′(h)-°0.25 where h is the distance from the trace bottom, and A ′ is a factor dependent on laser processing conditions. A′ 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 4.68GPa 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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.08.105