An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075

An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075

The focus of this report is on the mechanical end corrosion properties of high-strength aluminum alloys. Aluminum alloy 7075, a common material in the aerospace industry, is susceptible to stress-corrosion cracking (SCC) in the T6, or peak-aged temper. The susceptibility of this temper to SCC is...

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Main Author: Nurul Mardhiah, Mohd Azizuddin
Format: Monograph
Published: UTeM 2010
Subjects:
T Technology (General)
TA Engineering (General). Civil engineering (General)
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spelling utem-33962015-05-28T02:35:00Z An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075 Nurul Mardhiah, Mohd Azizuddin T Technology (General) TA Engineering (General). Civil engineering (General) The focus of this report is on the mechanical end corrosion properties of high-strength aluminum alloys. Aluminum alloy 7075, a common material in the aerospace industry, is susceptible to stress-corrosion cracking (SCC) in the T6, or peak-aged temper. The susceptibility of this temper to SCC is alleviated through the use of the T73, or overaged temper. This temper exhibits significantly better SCC resistance, but at a 10-15% strength loss compared to the T6 temper. Cina end Ranish patented a new heat treatment known as retrogression end reaging (RRA) in 1974. Experimental test results indicate that the RRA heat treatment reduces the traditional trade-off between T6 strength end T73 SCC resistance. However, the short time heat treatment limits the applicability of REA to thin sections of material. Retrogression and Reaging (RRA) is a new thermal process introduced for the purpose of enhancing corrosion resistance of 7075-T651 aluminum alloy while maintaining its T6 strength. In this study a 7075 material so treated was investigated for its mechanical and corrosion resistant properties. Results indicated that the RRA treated 7075 was significantly better than the T6 temper in resistance to stress corrosion cracking and exfoliation corrosion. The loss in strength from RRA treatment was minimal. Electron microscopy of the fractured surface showed a distinct difference in the fracture mode when compared to the T6 temper condition. Tests results indicated that the RRA heat treatment resulted in fatigue and fracture toughness properties superior to the 7075-T651. UTeM 2010 Monograph NonPeerReviewed application/pdf http://eprints.utem.edu.my/3396/1/An_Investigation_Of_The_Effect_Of_Retrogression_And_Reaging_%28RRA%29_Treatment_On_Stress_Corrosion_Cracking_%28SCC%29_Of_Aluminum_Alloy_7075_-_24_pages_-_Copy.pdf application/pdf http://eprints.utem.edu.my/3396/2/An_Investigation_Of_The_Effect_Of_Retrogression_And_Reaging_%28RRA%29_Treatment_On_Stress_Corrosion_Cracking_%28SCC%29_Of_Aluminum_Alloy_7075_-_Full_Text.pdf http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=graphicFullDisplayRetriever.jsp&szMaterialNo=0000063434 Nurul Mardhiah, Mohd Azizuddin (2010) An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075. Project Report. UTeM, Melaka, Malaysia. (Submitted) http://eprints.utem.edu.my/3396/
repository_type Digital Repository
institution_category Local University
institution Universiti Teknikal Malaysia Melaka
building UTeM Institutional Repository
collection Online Access
topic T Technology (General)
TA Engineering (General). Civil engineering (General)
spellingShingle T Technology (General)
TA Engineering (General). Civil engineering (General)
Nurul Mardhiah, Mohd Azizuddin
An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075
description The focus of this report is on the mechanical end corrosion properties of high-strength aluminum alloys. Aluminum alloy 7075, a common material in the aerospace industry, is susceptible to stress-corrosion cracking (SCC) in the T6, or peak-aged temper. The susceptibility of this temper to SCC is alleviated through the use of the T73, or overaged temper. This temper exhibits significantly better SCC resistance, but at a 10-15% strength loss compared to the T6 temper. Cina end Ranish patented a new heat treatment known as retrogression end reaging (RRA) in 1974. Experimental test results indicate that the RRA heat treatment reduces the traditional trade-off between T6 strength end T73 SCC resistance. However, the short time heat treatment limits the applicability of REA to thin sections of material. Retrogression and Reaging (RRA) is a new thermal process introduced for the purpose of enhancing corrosion resistance of 7075-T651 aluminum alloy while maintaining its T6 strength. In this study a 7075 material so treated was investigated for its mechanical and corrosion resistant properties. Results indicated that the RRA treated 7075 was significantly better than the T6 temper in resistance to stress corrosion cracking and exfoliation corrosion. The loss in strength from RRA treatment was minimal. Electron microscopy of the fractured surface showed a distinct difference in the fracture mode when compared to the T6 temper condition. Tests results indicated that the RRA heat treatment resulted in fatigue and fracture toughness properties superior to the 7075-T651.
format Monograph
author Nurul Mardhiah, Mohd Azizuddin
author_facet Nurul Mardhiah, Mohd Azizuddin
author_sort Nurul Mardhiah, Mohd Azizuddin
title An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075
title_short An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075
title_full An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075
title_fullStr An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075
title_full_unstemmed An Investigation Of The Effect Of Retrogression And Reaging (RRA) Treatment On Stress Corrosion Cracking (SCC) Of Aluminum Alloy 7075
title_sort investigation of the effect of retrogression and reaging (rra) treatment on stress corrosion cracking (scc) of aluminum alloy 7075
publisher UTeM
publishDate 2010
url http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=graphicFullDisplayRetriever.jsp&szMaterialNo=0000063434
http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=graphicFullDisplayRetriever.jsp&szMaterialNo=0000063434
http://eprints.utem.edu.my/3396/1/An_Investigation_Of_The_Effect_Of_Retrogression_And_Reaging_%28RRA%29_Treatment_On_Stress_Corrosion_Cracking_%28SCC%29_Of_Aluminum_Alloy_7075_-_24_pages_-_Copy.pdf
http://eprints.utem.edu.my/3396/2/An_Investigation_Of_The_Effect_Of_Retrogression_And_Reaging_%28RRA%29_Treatment_On_Stress_Corrosion_Cracking_%28SCC%29_Of_Aluminum_Alloy_7075_-_Full_Text.pdf
first_indexed 2018-09-05T10:13:48Z
last_indexed 2018-09-05T10:13:48Z
_version_ 1610762083117301760

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