Influence of precipitation on yield elongation in Mg-Zn alloys

Jun Wang; Mahmoud Reza Ghandehari Ferdowsi; Sitarama R. Kada; Christopher R. Hutchinson; Matthew R. Barnett

doi:10.1016/j.scriptamat.2018.09.023

Influence of precipitation on yield elongation in Mg-Zn alloys

Jun Wang, Mahmoud Reza Ghandehari Ferdowsi, Sitarama R. Kada, Christopher R. Hutchinson, Matthew R. Barnett

Materials Science & Engineering

Research output: Contribution to journal › Article › Research › peer-review

28 Citations (Scopus)

Abstract

The effect of precipitation on yield elongation in an extruded Mg-4.5 wt% Zn alloy is investigated. The yield plateau is shown to disappear in the presence of precipitation and it is subsequently proposed that two criteria need to be satisfied for a distinct yield plateau: (1) the initial propagation of twins is autocatalytic in that twinning in one grain should stimulate twinning in an adjacent grain; (2) the twins that initially form should display an appreciable aspect ratio. These two criteria can also explain why the yield elongation decreases with an increase in grain size and deformation temperature.

Original language	English
Pages (from-to)	5-8
Number of pages	4
Journal	Scripta Materialia
Volume	160
DOIs	https://doi.org/10.1016/j.scriptamat.2018.09.023
Publication status	Published - 1 Feb 2019

Keywords

Magnesium alloys
Precipitation
Twinning
Yield elongation

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10.1016/j.scriptamat.2018.09.023

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abstract = "The effect of precipitation on yield elongation in an extruded Mg-4.5 wt% Zn alloy is investigated. The yield plateau is shown to disappear in the presence of precipitation and it is subsequently proposed that two criteria need to be satisfied for a distinct yield plateau: (1) the initial propagation of twins is autocatalytic in that twinning in one grain should stimulate twinning in an adjacent grain; (2) the twins that initially form should display an appreciable aspect ratio. These two criteria can also explain why the yield elongation decreases with an increase in grain size and deformation temperature.",

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AU - Ferdowsi, Mahmoud Reza Ghandehari

AU - Kada, Sitarama R.

AU - Hutchinson, Christopher R.

AU - Barnett, Matthew R.

PY - 2019/2/1

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N2 - The effect of precipitation on yield elongation in an extruded Mg-4.5 wt% Zn alloy is investigated. The yield plateau is shown to disappear in the presence of precipitation and it is subsequently proposed that two criteria need to be satisfied for a distinct yield plateau: (1) the initial propagation of twins is autocatalytic in that twinning in one grain should stimulate twinning in an adjacent grain; (2) the twins that initially form should display an appreciable aspect ratio. These two criteria can also explain why the yield elongation decreases with an increase in grain size and deformation temperature.

AB - The effect of precipitation on yield elongation in an extruded Mg-4.5 wt% Zn alloy is investigated. The yield plateau is shown to disappear in the presence of precipitation and it is subsequently proposed that two criteria need to be satisfied for a distinct yield plateau: (1) the initial propagation of twins is autocatalytic in that twinning in one grain should stimulate twinning in an adjacent grain; (2) the twins that initially form should display an appreciable aspect ratio. These two criteria can also explain why the yield elongation decreases with an increase in grain size and deformation temperature.

KW - Magnesium alloys

KW - Precipitation

KW - Twinning

KW - Yield elongation

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VL - 160

SP - 5

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JO - Scripta Materialia

JF - Scripta Materialia

ER -

Influence of precipitation on yield elongation in Mg-Zn alloys

Abstract

Keywords

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