Improvements in mechanical and stress corrosion cracking properties in Al-alloy 7075 via retrogression and reaging

Reda, Y.; Abdel-Karim, R.; El-Mahallawi, I.

doi:10.1016/j.msea.2007.08.025

Cited by 130 publications

(44 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It was found that an increase in the chloride ion content of environment up to 0.6M enhanced the SCC growth rate, and the cracking was slower at higher concentrations. Great efforts have been made to increase the stress corrosion resistance (SCR) of high strength aluminum alloys by optimization of microstructure via heat treatment [93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109].…”

Section: Introductionmentioning

confidence: 99%

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Jiang¹

2011

View full text Add to dashboard Cite

Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions searching data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information Send comments regarding this burden estimate or any other aspect of this collection of information including suggestions for reducing this burden to Washington Headquarters Service, Directorate SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)Office of Naval Research, Code-332 875 North Randolph Street, Suite 1425, Room-629 Arlington, VA 22203 SPONSOR/MONITOR'S ACRONYM(S)11. SPONSORING/MONITORING AGENCY REPORT NUMBER DISTRIBUTION AVAILABILITY STATEMENTApproved for Public Release; Distribution is Unlimited SUPPLEMENTARY NOTES ABSTRACTStress corrosion cracking (SCC) experiments were conducted on 4340 steel in NaCI aqueous solutions of different concentrations. Despite the differences in controlling conditions, the experiments yielded similar results for the threshold stress intensity factor and the plateau velocity in the 3.5 wt% NaCI solution. Dependence of the plateau velocity on the NaCI concentration was observed. SCC experiments on 7075-T651 Al alloy were conducted in chromate-inhibited, acidic NaCI aqueous solutions with different concentrations. The SCC process consists of three stages: incubation, transient crack growth, and stable crack growth. The incubation time is highly dependent on the load level. For a given NaCI concentration, the relationship between the applied load and the incubation time follows a power law function. A NaCI concentration of 0.1% results in the shortest incubation time and the fastest plateau velocity. SUBJECT TERMS4340 steel, 7075-T651 aluminum alloy, incubation time, stress corrosion. 775-784-4510Standard Form 298 (Rev. 8-98)Prescribed by ANSI-Std Z39-18 ENVIRONMENTAL EFFECTS ON THE INCUBATION TIME CHARACTERISTICS IN STRESS-CORROSION CRACKING SUMMARYThe objectives of the research are to (i) explore the incubation time characteristics in stress-corrosion cracking with the influence of the anodic dissolution cracking and hydrogen assisted cracking in different environments and at various applied stresses, and, (ii) quantify the incubation time with respect to the driving force considering the environmental effect.Extensive stress corrosion cracking (SCC) experiments were conducted on 7075-T651 aluminum alloy and the high strength martensitic steel AISI 4340 (yield stress = 1503 MPa) in sodium chloride (NaCI) aqueous solutions of different concentrations. The experiments on AISI 4340 were conducted under the controls of constant load, constant crack opening displacement (COD), constant loading rate, and constant COD rate. Despite the differences in controlling conditions, the experiments yielded similar results for the threshold stress intensity factor and the plateau velocity in the 3.5 wt% NaCI solution. Dependence of the plateau velocity on the NaCI concentration was observed, while the values of the ...

show abstract

Section: Introductionmentioning

confidence: 99%

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Jiang¹

2011

View full text Add to dashboard Cite

show abstract

“…Chopped fibers can produce significant property enhancement in the two dimensionally in the direction of their orientation, at moderate cost. MMCs provide moderate but isotropic properties [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of precipitation hardened Al7075-grey cast iron powder reinforced metal matrix composites

2018

View full text Add to dashboard Cite

Abstract. Al7075 alloy is the most commonly used by the aerospace industry. Al7075 alloy is characterized by its improved properties such as higher toughness, specific strength and hardness. The current work focuses on the preparation and characterization of age hardened Al7075-Grey cast iron composites. Two stage stir casting technique is used for the preparation of the composite. Age hardening treatment is imparted to enhance the mechanical characteristics. The variation of hardness and tensile strength with respect to aging temperature and percentage of reinforcement is analyzed. The composites exhibit higher hardness and tensile strength as the reinforcement percentage is increased at an aging temperature of 100 0 C.

show abstract

“…In next researches [13,14] find that the strength is maintained at T6 level by RRA treatment and the stress corrosion cracking (SCC) resistance is close to T7 at the same time. Su et al [15,16] report that the RRA treatment also can improve the intergranular corrosion and exfoliation corrosion sensibility of a spray formed 7075 alloy.…”

mentioning

confidence: 99%

“…Wu et al [21] and Reda et al [13] find that the sufficient retrogressed effects can be received by long-time retrogressions at a temperature below 200°C but the mechanical properties are lost at the same time.…”

mentioning

confidence: 99%

Influence of RRA Treatment on the Microstructure and Stress Corrosion Cracking Behavior of the Spray-Formed 7075 Alloy

et al. 2015

Mater Sci

View full text Add to dashboard Cite

Improvements in mechanical and stress corrosion cracking properties in Al-alloy 7075 via retrogression and reaging

Cited by 130 publications

References 7 publications

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Environmental Effects on the Incubation Time Characteristics in Stress-Corrosion Cracking

Mechanical characterization of precipitation hardened Al7075-grey cast iron powder reinforced metal matrix composites

Influence of RRA Treatment on the Microstructure and Stress Corrosion Cracking Behavior of the Spray-Formed 7075 Alloy

Contact Info

Product

Resources

About