Ultrahigh strength and plasticity in laser rapid solidified Al–Si nanoscale eutectics

Authors

Huai-Hsun Lien, University of Michigan, Ann ArborFollow
Jyoti Mazumder, University of Michigan, Ann Arbor
Jian Wang, University of Nebraska-Lincoln
Amit Misra, University of Michigan, Ann Arbor

ORCID IDs

http://orcid.org/0000-0003-1164-4533

http://orcid.org/0000-0002-5295-8814

http://orcid.org/0000-0001-5130-300X

http://orcid.org/0000-0003-3634-6823

Date of this Version

2020

Citation

MATER. RES. LETT. 2020, VOL. 8, NO. 8, 291–298 https://doi.org/10.1080/21663831.2020.1755380

Comments

2020 The Author(s)

Abstract

As-cast Al–20wt.% Si alloys were processed via laser rapid solidification (LRS) techniques to create eutectic microstructures with nanoscale interconnected, nanotwinned Si fibers. LRS morphologies exhibit higher flow stress, exceeding 800 MPa and uniform plastic deformation above 20% compared to as-cast alloy that fractures at strains below 8% at flow strength of approximately 200 MPa. The strengthening mechanisms of LRS morphologies are interpreted in terms of the interfacial constraints: increase in yield strength as well as strain hardening rate due to nanoscale confined slip in fibrous Al–Si eutectic, and load transfer and eventual plasticity in the nanoscale Si fibers.