Effect of excess Si on age-hardening in deformed Al-Mg2Si alloys.

Matsuda, Kenji; Terasaki, M.; Tada, Shizuo; Ikeno, Susumu

doi:10.2464/jilm.45.95

Cited by 14 publications

(4 citation statements)

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“…However, most of the results show that the dislocations have a significant effect on the formation of GP zones and the nucleation and growth of the intermediate phases are accelerated largely by cold rolling. [15][16][17][18] HRTEM studies of Matsuda et al [19] showed that type-C precipitates (similar to QЈ/Q) are typical in a deformed excess Si alloy, whereas in balanced Al-Mg-Si, no type-C precipitates were found.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18] It is reported that the introduction of deformation as part of the heat-treatment process can significantly influence the age hardening of 6xxx series alloys. [15,18] The effect of cold deformation on the precipitation and aging behavior depends on the level of deformation. However, most of the results show that the dislocations have a significant effect on the formation of GP zones and the nucleation and growth of the intermediate phases are accelerated largely by cold rolling.…”

Section: Introductionmentioning

confidence: 99%

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The effect of cold deformation on the kinetics of the β″ precipitates in an Al-Mg-Si alloy

Yassar

Field

Weiland

2005

Metall Mater Trans A

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Kinetics of ␤Љ precipitation in an Al-0.55 pct Mg-1.1 wt pct Si (AA6022) in both deformed and undeformed conditions were investigated by means of differential scanning calorimetry (DSC). Transmission electron microscopy (TEM) analysis on predeformed samples was also performed to study the effect of deformation on ␤Љ precipitates. It was found that the introduction of dislocations changes the precipitate type from ␤Љ to ␤Ј and QЈ. Also the measured activation energy for precipitate formation in the case of predeformed and undeformed samples was compared. The results show that dislocations facilitate precipitation by decreasing the activation energy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of cold deformation on the kinetics of the β″ precipitates in an Al-Mg-Si alloy

Yassar

Field

Weiland

2005

Metall Mater Trans A

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“…For Al-Mg-Si alloys, previous work revealed by DSC analysis that pre-straining accelerates precipitation because of decreased activation energy for the growth of precipitates. 8,9) Matsuda et al 10) reported that 5% pre-strain following pre-aged at 423 K for 60 ks improves bake-hardening response in under-aged condition and results in higher peak hardness at 473 K for an Al-0.37 mass%Mg-0.62 mass%Si alloy. Furthermore, Birol et al 11,12) reported that pre-straining shortly after solution heat treatment suppresses clustering behavior at room temperature, but results in the enhanced formation of the 00 phase during aging at 453 K. These suggest that the combined effect of pre-straining and pre-aging is quite useful, but still have room for investigation under various combinations of the amount of pre-strain and pre-aging temperature.…”

Section: )mentioning

confidence: 99%

Combined Effect of Pre-Straining and Pre-Aging on Bake-Hardening Behavior of an Al-0.6 mass%Mg-1.0 mass%Si Alloy

et al. 2010

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The effect of pre-straining in combination with pre-aging on bake-hardening behavior of an Al-0.6 mass%Mg-1.0 mass%Si alloy was investigated by means of Vickers hardness test, electrical conductivity measurement, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). Hardness change and DSC analysis revealed that only 3% pre-strain suppresses the formation of clusters; i.e. cluster(1), during single aging below 343 K. On the other hand, by combining with pre-aging at 343 K, pre-straining was found to improve bakehardening response during final aging at 443 K. TEM observation confirmed that the improvement of bake-hardening response by pre-straining is mainly due to the enhanced precipitation of 00 phase in the matrix. These results are explained by the consideration that dislocations induced by pre-straining reduce the concentration of quenched-in excess vacancies, resulting in both the suppressed clustering of solute atoms during pre-aging and the accelerated precipitation of the 00 phase from more supersaturated solute atoms in final aging.

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“…In most of the cases, metastable 2 nd phases precipitate during ageing play significant role for improving the mechanical properties. Large numbers of microstructural defects generate during mechanical working and they may be act as neucleant (nucleation site) for these metastable phases, though very few studies are available [7,8]. But plenty of literatures are available for the decomposition of super saturated Al-Mg-Si alloys after artificial ageing [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Role of dynamic precipitation on the strengthening mechanism of cryorolled 6063 Al alloy

Das

2011

Trans Indian Inst Met

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6063 Al alloys was cryorolled under solutionized (sample1) and peak aged condition (sample2) to study the role of dynamic precipitation on the strengthening mechanism. It is observed that in case of sample1 dislocations density is more compare to sample2. In the 1 st case high angle sub grains (presence of high fraction of HAGBs) of less than 100 nm in size have been generated during cryorolling. In case of sample2, grains are aligned along the rolling direction. This is obvious that the higher densities of dislocations (in sample1) restrict the grain boundaries to be aligned along the rolling direction. Therefore, the grain boundaries are aligned along the rolling direction only in case of sample2. Whereas such type of alignments of grain boundaries are not observed in case of sample1. Presence of very fine grains along with high density of dislocations are responsible for attaining higher strength of sample1 compare to sample2.

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Effect of excess Si on age-hardening in deformed Al-Mg2Si alloys.

Cited by 14 publications

References 0 publications

The effect of cold deformation on the kinetics of the β″ precipitates in an Al-Mg-Si alloy

The effect of cold deformation on the kinetics of the β″ precipitates in an Al-Mg-Si alloy

Combined Effect of Pre-Straining and Pre-Aging on Bake-Hardening Behavior of an Al-0.6 mass%Mg-1.0 mass%Si Alloy

Role of dynamic precipitation on the strengthening mechanism of cryorolled 6063 Al alloy

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