2009
DOI: 10.2320/matertrans.mra2008468
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Influence of Severe Plastic Deformation on Precipitation Hardening in an Al-Mg-Si Alloy: Microstructure and Mechanical Properties

Abstract: Equal channel angular extrusion (ECAE) is applied to an age-hardening Al-Mg-Si alloy at temperatures where concurrent aging (dynamic aging) can occur to form fine 00 -Mg 2 Si precipitates, and an ultrafine-grained matrix with high dislocation density can be maintained. This microstructure results in significant strength enhancement with little sacrifice in tensile ductility. The large plastic strain imposed by ECAE causes a fraction of the precipitates to dissolve into the aluminum matrix, which re-precipitate… Show more

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Cited by 17 publications
(7 citation statements)
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“…Table I summarizes previously reported experimental results on concurrent strengthening by SPD and the age-hardenings technique for a number of age-hardenable aluminum alloys. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Although the specimens under no SPD condition (i.e., equivalent strain less than 4) possess relatively good agehardenability, most of the severely deformed and then artificially aged specimens exhibit either suppressed age hardenings or age softening as denoted by smaller D or large .. The following are the main features extracted from Table I, where attained values of hardness/ strength, the degree of age hardenings/softening, and the corresponding microstructures are reviewed according to the alloy system, equivalent strain, and aging temperature.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Table I summarizes previously reported experimental results on concurrent strengthening by SPD and the age-hardenings technique for a number of age-hardenable aluminum alloys. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Although the specimens under no SPD condition (i.e., equivalent strain less than 4) possess relatively good agehardenability, most of the severely deformed and then artificially aged specimens exhibit either suppressed age hardenings or age softening as denoted by smaller D or large .. The following are the main features extracted from Table I, where attained values of hardness/ strength, the degree of age hardenings/softening, and the corresponding microstructures are reviewed according to the alloy system, equivalent strain, and aging temperature.…”
Section: Introductionmentioning
confidence: 99%
“…Reported Experimental Results on Concurrent Strengthening of Age-Hardenable Aluminum Alloys by Severe Plastic Deformation (SPD) and Age-Hardenings Technique[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] …”
mentioning
confidence: 99%
“…It has been extensively utilized in aircraft structural parts and other highly stressed structural applications [12][13][14][15][16] . But aluminium-zinc alloy as it is in 7075 Al alloy is susceptible to embrittlement because of microsegregation of MgZn 2 precipitates which may lead to catastrophic failure of components produced from it 17,18 . The alloy is also susceptibility to stress corrosion cracking 19,20 .…”
Section: Introductionmentioning
confidence: 99%
“…The formation of these microsegregations (hard precipitates) and inherent residual stresses that are associated with their fabrication methods have serious negative effect on their mechanical properties 18 . Hence, this study is aimed at resolving the problems of microsegregations and inherent residual stresses that are associated with aluminium-zinc for improved service performance.…”
Section: Introductionmentioning
confidence: 99%
“…Impact is the measure of work done to fracture [27]. The various values of the impact energy at which each specimen fractures are shown in Figure 5.…”
Section: Impact Testmentioning
confidence: 99%