Superplastic Behavior at Lower Temperatures of High-Strength Ultrafine-Grained Al Alloy 7475

Research outputpeer-review

4 Citations (Scopus)

Abstract

This study aims to achieve high ductility at lower temperatures (170 and 200 °C) while retaining enhanced mechanical strength in the ultrafine-grained high-strength Al-based alloy 7475. The ultrafine grain structure is formed by high pressure torsion (HPT) at room temperature. Isochronous annealing in a range of temperatures from 80 to 450 °С demonstrated that the high hardness values are retained or change insignificantly up to 200 °С. Static testing was performed at 120–200 °С and strain rates from 10 −2 to 10 −4 s −1 to determine the ductility and strain rate sensitivity. Elongations of 500% is achieved at 170 °С and a strain rate of 10 −3 s −1 , and of 700% at 200 °С and a strain rate of 5 × 10 −4 s −1 .

Original languageEnglish
Article number1800094
Number of pages5
JournalAdvanced Engineering Materials
Volume21
Issue number1
DOIs
Publication statusPublished - 1 Jan 2019

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high strength
strain rate
Strain rate
ductility
Ductility
Temperature
Crystal microstructure
retaining
Torsional stress
elongation
Strength of materials
torsion
Elongation
hardness
Hardness
Annealing
annealing
Ultrafine
Testing
room temperature

Scopus subject areas

  • Condensed Matter Physics
  • Materials Science(all)

Cite this

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title = "Superplastic Behavior at Lower Temperatures of High-Strength Ultrafine-Grained Al Alloy 7475",
abstract = "This study aims to achieve high ductility at lower temperatures (170 and 200 °C) while retaining enhanced mechanical strength in the ultrafine-grained high-strength Al-based alloy 7475. The ultrafine grain structure is formed by high pressure torsion (HPT) at room temperature. Isochronous annealing in a range of temperatures from 80 to 450 °С demonstrated that the high hardness values are retained or change insignificantly up to 200 °С. Static testing was performed at 120–200 °С and strain rates from 10 −2 to 10 −4 s −1 to determine the ductility and strain rate sensitivity. Elongations of 500{\%} is achieved at 170 °С and a strain rate of 10 −3 s −1 , and of 700{\%} at 200 °С and a strain rate of 5 × 10 −4 s −1 .",
keywords = "Aluminium alloys, High-strength state, Mechanical properties, Severe plastic deformation, Superplasticity, Thermo-mechanical treatment, Ultrafine-grained materials, REFINEMENT, STRAIN-RATE SUPERPLASTICITY, DUCTILITY, FLOW",
author = "Bobruk, {Elena V.} and Murashkin, {Maxim Y.} and Kazykhanov, {Vil U.} and Valiev, {Ruslan Z.}",
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language = "English",
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T1 - Superplastic Behavior at Lower Temperatures of High-Strength Ultrafine-Grained Al Alloy 7475

AU - Bobruk, Elena V.

AU - Murashkin, Maxim Y.

AU - Kazykhanov, Vil U.

AU - Valiev, Ruslan Z.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - This study aims to achieve high ductility at lower temperatures (170 and 200 °C) while retaining enhanced mechanical strength in the ultrafine-grained high-strength Al-based alloy 7475. The ultrafine grain structure is formed by high pressure torsion (HPT) at room temperature. Isochronous annealing in a range of temperatures from 80 to 450 °С demonstrated that the high hardness values are retained or change insignificantly up to 200 °С. Static testing was performed at 120–200 °С and strain rates from 10 −2 to 10 −4 s −1 to determine the ductility and strain rate sensitivity. Elongations of 500% is achieved at 170 °С and a strain rate of 10 −3 s −1 , and of 700% at 200 °С and a strain rate of 5 × 10 −4 s −1 .

AB - This study aims to achieve high ductility at lower temperatures (170 and 200 °C) while retaining enhanced mechanical strength in the ultrafine-grained high-strength Al-based alloy 7475. The ultrafine grain structure is formed by high pressure torsion (HPT) at room temperature. Isochronous annealing in a range of temperatures from 80 to 450 °С demonstrated that the high hardness values are retained or change insignificantly up to 200 °С. Static testing was performed at 120–200 °С and strain rates from 10 −2 to 10 −4 s −1 to determine the ductility and strain rate sensitivity. Elongations of 500% is achieved at 170 °С and a strain rate of 10 −3 s −1 , and of 700% at 200 °С and a strain rate of 5 × 10 −4 s −1 .

KW - Aluminium alloys

KW - High-strength state

KW - Mechanical properties

KW - Severe plastic deformation

KW - Superplasticity

KW - Thermo-mechanical treatment

KW - Ultrafine-grained materials

KW - REFINEMENT

KW - STRAIN-RATE SUPERPLASTICITY

KW - DUCTILITY

KW - FLOW

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DO - 10.1002/adem.201800094

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JO - Advanced Engineering Materials

JF - Advanced Engineering Materials

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