header

Deformation Assisted Nucleation of Continuous Nanoprecipitates in Mg-Al Alloys

26 Pages Posted: 12 Nov 2019 Publication Status: Accepted

See all articles by Suhas Eswarappa Prameela

Suhas Eswarappa Prameela

Johns Hopkins University - Department of Materials Science and Engineering; Johns Hopkins University - Hopkins Extreme Materials Institute

Peng Yi

Johns Hopkins University - Department of Materials Science and Engineering

Beatriz Mediros

Johns Hopkins University - Department of Materials Science and Engineering

Vance Liu

Johns Hopkins University - Department of Materials Science and Engineering

Laszlo J. Keckes

Johns Hopkins University - Hopkins Extreme Materials Institute

Michael L. Falk

Johns Hopkins University - Department of Materials Science and Engineering; Johns Hopkins University - Hopkins Extreme Materials Institute; Johns Hopkins University - Department of Mechanical Engineering; Johns Hopkins University - Department of Physics and Astronomy

Timothy P. Weihs

Johns Hopkins University - Department of Materials Science and Engineering; Johns Hopkins University - Hopkins Extreme Materials Institute

Abstract

Conventional aging of magnesium alloys results in a low number density of laths providing poor precipitate strengthening. We demonstrate that dynamic strain aging (DSA) of Mg-Al (6 and 9 wt.%) alloys produces a high density of nanoprecipitates with small aspect ratios within grain interiors. Nanoindentation of these samples yields much higher hardness values compared to conventionally peak-aged samples. The precipitate number density correlates with the dislocation density observed in experiments and calculated using a strain hardening model. We argue that dislocation multiplication increases the number of heterogeneous precipitate nucleation sites and thereby enhances precipitation.

Keywords: magnesium alloys, dynamic strain aging, strain hardening, dislocation, precipitation nucleation and growth, phase transformation

Suggested Citation

Prameela, Suhas Eswarappa and Yi, Peng and Mediros, Beatriz and Liu, Vance and Keckes, Laszlo J. and Falk, Michael L. and Weihs, Timothy P., Deformation Assisted Nucleation of Continuous Nanoprecipitates in Mg-Al Alloys (11 11, 2019). Available at SSRN: https://ssrn.com/abstract=3484667 or http://dx.doi.org/10.2139/ssrn.3484667

Suhas Eswarappa Prameela (Contact Author)

Johns Hopkins University - Department of Materials Science and Engineering ( email )

Baltimore, MD 20036-1984
United States

Johns Hopkins University - Hopkins Extreme Materials Institute ( email )

Baltimore, MD 20036-1984
United States

Peng Yi

Johns Hopkins University - Department of Materials Science and Engineering

Baltimore, MD 20036-1984
United States

Beatriz Mediros

Johns Hopkins University - Department of Materials Science and Engineering

Baltimore, MD 20036-1984
United States

Vance Liu

Johns Hopkins University - Department of Materials Science and Engineering

Baltimore, MD 20036-1984
United States

Laszlo J. Keckes

Johns Hopkins University - Hopkins Extreme Materials Institute

United States

Michael L. Falk

Johns Hopkins University - Department of Materials Science and Engineering

Baltimore, MD 20036-1984
United States

Johns Hopkins University - Hopkins Extreme Materials Institute

United States

Johns Hopkins University - Department of Mechanical Engineering

United States

Johns Hopkins University - Department of Physics and Astronomy

MD
United States

Timothy P. Weihs

Johns Hopkins University - Department of Materials Science and Engineering

Baltimore, MD 20036-1984
United States

Johns Hopkins University - Hopkins Extreme Materials Institute ( email )

Baltimore, MD 20036-1984
United States

Here is the Coronavirus
related research on SSRN

Paper statistics

Abstract Views
212
Downloads
23
PlumX Metrics