Low Temperature Superplasticity of High-Strength Ultrafine- Grained Al 7050 alloy

Research outputpeer-review

Abstract

Ultrafine-grained (UFG) Al 7050 alloy of the 7xxx series demonstrates very high
strength at room temperature with UTS=845 MPa and hardness Hv=255, which considerably
exceeds the value after conventional heat treatment T73, i.e. Hv=165. It is also revealed that
with increasing temperature the alloy exhibits rather high ductility with elongation to failure
δ=170% at 120 °C and strain rate of 5×10–4 s-1 and typical superplastic behavior with δ=480%
and δ=690% at temperatures 170 °C and 200 °C correspondingly. Such values of
superplasticity (SP) temperature are considerably lower than that typical of this alloy with
micron-sized grains (TSP=450-500 °C). Such reduction in superplasticity temperature made it
possible to preserve ultrafine grains in the alloy structure and provide its high-strength state
after SP straining.
Original languageEnglish
Article number012090
Number of pages6
JournalMaterials Science and Engineering
Volume461
Issue numberIOP Conf. Series
Publication statusPublished - 10 Dec 2018

Cite this

@article{072a309e386b490c988498009d3db1e9,
title = "Low Temperature Superplasticity of High-Strength Ultrafine- Grained Al 7050 alloy",
abstract = "Ultrafine-grained (UFG) Al 7050 alloy of the 7xxx series demonstrates very highstrength at room temperature with UTS=845 MPa and hardness Hv=255, which considerablyexceeds the value after conventional heat treatment T73, i.e. Hv=165. It is also revealed thatwith increasing temperature the alloy exhibits rather high ductility with elongation to failureδ=170{\%} at 120 °C and strain rate of 5×10–4 s-1 and typical superplastic behavior with δ=480{\%}and δ=690{\%} at temperatures 170 °C and 200 °C correspondingly. Such values ofsuperplasticity (SP) temperature are considerably lower than that typical of this alloy withmicron-sized grains (TSP=450-500 °C). Such reduction in superplasticity temperature made itpossible to preserve ultrafine grains in the alloy structure and provide its high-strength stateafter SP straining.",
author = "Бобрук, {Елена Владимировна}",
year = "2018",
month = "12",
day = "10",
language = "English",
volume = "461",
journal = "Materials Science and Engineering",
issn = "0025-5416",
publisher = "Elsevier",
number = "IOP Conf. Series",

}

TY - JOUR

T1 - Low Temperature Superplasticity of High-Strength Ultrafine- Grained Al 7050 alloy

AU - Бобрук, Елена Владимировна

PY - 2018/12/10

Y1 - 2018/12/10

N2 - Ultrafine-grained (UFG) Al 7050 alloy of the 7xxx series demonstrates very highstrength at room temperature with UTS=845 MPa and hardness Hv=255, which considerablyexceeds the value after conventional heat treatment T73, i.e. Hv=165. It is also revealed thatwith increasing temperature the alloy exhibits rather high ductility with elongation to failureδ=170% at 120 °C and strain rate of 5×10–4 s-1 and typical superplastic behavior with δ=480%and δ=690% at temperatures 170 °C and 200 °C correspondingly. Such values ofsuperplasticity (SP) temperature are considerably lower than that typical of this alloy withmicron-sized grains (TSP=450-500 °C). Such reduction in superplasticity temperature made itpossible to preserve ultrafine grains in the alloy structure and provide its high-strength stateafter SP straining.

AB - Ultrafine-grained (UFG) Al 7050 alloy of the 7xxx series demonstrates very highstrength at room temperature with UTS=845 MPa and hardness Hv=255, which considerablyexceeds the value after conventional heat treatment T73, i.e. Hv=165. It is also revealed thatwith increasing temperature the alloy exhibits rather high ductility with elongation to failureδ=170% at 120 °C and strain rate of 5×10–4 s-1 and typical superplastic behavior with δ=480%and δ=690% at temperatures 170 °C and 200 °C correspondingly. Such values ofsuperplasticity (SP) temperature are considerably lower than that typical of this alloy withmicron-sized grains (TSP=450-500 °C). Such reduction in superplasticity temperature made itpossible to preserve ultrafine grains in the alloy structure and provide its high-strength stateafter SP straining.

M3 - Article

VL - 461

JO - Materials Science and Engineering

JF - Materials Science and Engineering

SN - 0025-5416

IS - IOP Conf. Series

M1 - 012090

ER -