Formation of a new incoherent twin boundary in a Mg-3Gd alloy

Xiaoying Shi; Yong Liu; Jian Lu; Robert E.A. Williams; Dejiang Li; Xiaoqin Zeng; Alan A. Luo

doi:10.1016/j.scriptamat.2015.09.033

Formation of a new incoherent twin boundary in a Mg-3Gd alloy

Xiaoying Shi, Yong Liu, Jian Lu, Robert E.A. Williams, Dejiang Li, Xiaoqin Zeng^*, Alan A. Luo^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

26 Citations (Scopus)

Abstract

Ordered-segregated Gd atoms in coherent twin boundaries (CTBs) improve the strength of Mg-Gd alloys after annealing. Here we show a new kind of incoherent twin boundary (ITB) with Gd segregation after annealing in a Mg-3Gd alloy. This new ITB (ITB') does not lie on 101¯2 twinning plane, nor is it parallel to [12¯10]. The thick morphology of this ITB' is due to twinning plane rotation around [0001]_Twin by uncertain angles (∼ 7° and ∼ 13° observed). The ITB', driven by dislocation rearrangement in the boundary and total system energy reduction, is supposed to have higher strengthening effect than normal ITB and CTB.

Original language	English
Pages (from-to)	136-139
Journal	Scripta Materialia
Volume	112
DOIs	https://doi.org/10.1016/j.scriptamat.2015.09.033
Publication status	Published - 1 Feb 2016

Research Keywords

Heat treatment
Incoherent twin boundary
Mg-Gd alloys
Twin boundary strengthening
Twining

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title = "Formation of a new incoherent twin boundary in a Mg-3Gd alloy",

abstract = "Ordered-segregated Gd atoms in coherent twin boundaries (CTBs) improve the strength of Mg-Gd alloys after annealing. Here we show a new kind of incoherent twin boundary (ITB) with Gd segregation after annealing in a Mg-3Gd alloy. This new ITB (ITB') does not lie on 101¯2 twinning plane, nor is it parallel to [12¯10]. The thick morphology of this ITB' is due to twinning plane rotation around [0001]Twin by uncertain angles (∼ 7° and ∼ 13° observed). The ITB', driven by dislocation rearrangement in the boundary and total system energy reduction, is supposed to have higher strengthening effect than normal ITB and CTB.",

keywords = "Heat treatment, Incoherent twin boundary, Mg-Gd alloys, Twin boundary strengthening, Twining",

author = "Xiaoying Shi and Yong Liu and Jian Lu and Williams, {Robert E.A.} and Dejiang Li and Xiaoqin Zeng and Luo, {Alan A.}",

year = "2016",

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doi = "10.1016/j.scriptamat.2015.09.033",

language = "English",

volume = "112",

pages = "136--139",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Acta Materialia Inc",

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TY - JOUR

T1 - Formation of a new incoherent twin boundary in a Mg-3Gd alloy

AU - Shi, Xiaoying

AU - Liu, Yong

AU - Lu, Jian

AU - Williams, Robert E.A.

AU - Li, Dejiang

AU - Zeng, Xiaoqin

AU - Luo, Alan A.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - Ordered-segregated Gd atoms in coherent twin boundaries (CTBs) improve the strength of Mg-Gd alloys after annealing. Here we show a new kind of incoherent twin boundary (ITB) with Gd segregation after annealing in a Mg-3Gd alloy. This new ITB (ITB') does not lie on 101¯2 twinning plane, nor is it parallel to [12¯10]. The thick morphology of this ITB' is due to twinning plane rotation around [0001]Twin by uncertain angles (∼ 7° and ∼ 13° observed). The ITB', driven by dislocation rearrangement in the boundary and total system energy reduction, is supposed to have higher strengthening effect than normal ITB and CTB.

AB - Ordered-segregated Gd atoms in coherent twin boundaries (CTBs) improve the strength of Mg-Gd alloys after annealing. Here we show a new kind of incoherent twin boundary (ITB) with Gd segregation after annealing in a Mg-3Gd alloy. This new ITB (ITB') does not lie on 101¯2 twinning plane, nor is it parallel to [12¯10]. The thick morphology of this ITB' is due to twinning plane rotation around [0001]Twin by uncertain angles (∼ 7° and ∼ 13° observed). The ITB', driven by dislocation rearrangement in the boundary and total system energy reduction, is supposed to have higher strengthening effect than normal ITB and CTB.

KW - Heat treatment

KW - Incoherent twin boundary

KW - Mg-Gd alloys

KW - Twin boundary strengthening

KW - Twining

UR - http://www.scopus.com/inward/record.url?scp=84948715144&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84948715144&origin=recordpage

U2 - 10.1016/j.scriptamat.2015.09.033

DO - 10.1016/j.scriptamat.2015.09.033

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6462

VL - 112

SP - 136

EP - 139

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Formation of a new incoherent twin boundary in a Mg-3Gd alloy

Abstract

Research Keywords

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