Influence of fine scale features on room temperature superplastic behaviour of an ultrafine-grained Al-30Zn alloy

Research outputpeer-review

Abstract

Two different ultrafine-grained states have been achieved in an Al-30Zn (wt%) alloy by high-pressure torsion (HPT) in different conditions. The material processed at room temperature exhibits a two phases mixture with Zn particles that have nucleated inside Al grains but also at triple lines and Zn segregation at grain boundaries. Under tensile stress at room temperature, this ultrafine grain structure gives rise to a superplastic behaviour with a total elongation exceeding 200%. Interestingly, further deformation by HPT at 50 °C leads to significantly finer intragranular Zn precipitates which affects the mechanical behavior reducing the elongation to failure down to only 70%. This transition in superplastic behaviour is attributed these fine scale Zn particles that should lead to a greater accumulation of dislocations and earlier failure.
Original languageEnglish
Pages (from-to)329-331
JournalMaterials Letters
Volume254
Publication statusPublished - 25 Jul 2019

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Torsional stress
Elongation
elongation
torsion
Crystal microstructure
room temperature
Tensile stress
Precipitates
Grain boundaries
tensile stress
Temperature
precipitates
grain boundaries
Ultrafine

Cite this

@article{61c98c4a4b8341e58901dd053daab5b3,
title = "Influence of fine scale features on room temperature superplastic behaviour of an ultrafine-grained Al-30Zn alloy",
abstract = "Two different ultrafine-grained states have been achieved in an Al-30Zn (wt{\%}) alloy by high-pressure torsion (HPT) in different conditions. The material processed at room temperature exhibits a two phases mixture with Zn particles that have nucleated inside Al grains but also at triple lines and Zn segregation at grain boundaries. Under tensile stress at room temperature, this ultrafine grain structure gives rise to a superplastic behaviour with a total elongation exceeding 200{\%}. Interestingly, further deformation by HPT at 50 °C leads to significantly finer intragranular Zn precipitates which affects the mechanical behavior reducing the elongation to failure down to only 70{\%}. This transition in superplastic behaviour is attributed these fine scale Zn particles that should lead to a greater accumulation of dislocations and earlier failure.",
author = "Bobruk, {Elena V.} and Xavier Sauvage and Еникеев, {Нариман Айратович} and Valiev, {Ruslan Z.}",
year = "2019",
month = "7",
day = "25",
language = "English",
volume = "254",
pages = "329--331",
journal = "Materials Letters",
issn = "0167-577X",
publisher = "Elsevier",

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TY - JOUR

T1 - Influence of fine scale features on room temperature superplastic behaviour of an ultrafine-grained Al-30Zn alloy

AU - Bobruk, Elena V.

AU - Sauvage, Xavier

AU - Еникеев, Нариман Айратович

AU - Valiev, Ruslan Z.

PY - 2019/7/25

Y1 - 2019/7/25

N2 - Two different ultrafine-grained states have been achieved in an Al-30Zn (wt%) alloy by high-pressure torsion (HPT) in different conditions. The material processed at room temperature exhibits a two phases mixture with Zn particles that have nucleated inside Al grains but also at triple lines and Zn segregation at grain boundaries. Under tensile stress at room temperature, this ultrafine grain structure gives rise to a superplastic behaviour with a total elongation exceeding 200%. Interestingly, further deformation by HPT at 50 °C leads to significantly finer intragranular Zn precipitates which affects the mechanical behavior reducing the elongation to failure down to only 70%. This transition in superplastic behaviour is attributed these fine scale Zn particles that should lead to a greater accumulation of dislocations and earlier failure.

AB - Two different ultrafine-grained states have been achieved in an Al-30Zn (wt%) alloy by high-pressure torsion (HPT) in different conditions. The material processed at room temperature exhibits a two phases mixture with Zn particles that have nucleated inside Al grains but also at triple lines and Zn segregation at grain boundaries. Under tensile stress at room temperature, this ultrafine grain structure gives rise to a superplastic behaviour with a total elongation exceeding 200%. Interestingly, further deformation by HPT at 50 °C leads to significantly finer intragranular Zn precipitates which affects the mechanical behavior reducing the elongation to failure down to only 70%. This transition in superplastic behaviour is attributed these fine scale Zn particles that should lead to a greater accumulation of dislocations and earlier failure.

UR - https://www.sciencedirect.com/science/article/pii/S0167577X19310845

M3 - Article

VL - 254

SP - 329

EP - 331

JO - Materials Letters

JF - Materials Letters

SN - 0167-577X

ER -