Microstructure of the post-ECAP aging processed 6061 Al alloys

Kim, Woo Jin; Wang, J.Y.

doi:10.1016/j.msea.2007.03.074

Cited by 87 publications

(34 citation statements)

References 15 publications

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“…Second, an aluminum alloy in a condition of supersaturated solid solution produced by initial water or oil quenching is processed by ECAP at a temperature below, equal to or slightly higher than the aging temperature (Figure 1b). Finally, the processed alloy is subjected to artificial aging [6][7][8][9]17,19,21,[25][26][27]. This is the most popular TMP route.…”

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

“…High YS originated from a combination of dislocation strengthening and dispersion strengthening. However, the total elongation decreases by almost a factor of two [6][7][8][9]17,21,26,27]. Decreased ductility is attributed to low work-hardening rate [6].…”

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

“…Therefore, the deformed structure resulting from these TMP routes could not be interpreted in terms of UFG structure [1]. Careful inspection of structural characterization data [6,8,9,17,19,23,26] showed that, for the most part, crystallites evolved under ECAP are delimited by low-angle boundaries (LAGBs); under SPD, the lattice dislocations arrange into cells and LAGBs or form the dislocation network within initial grains [17]. Therefore, it is not obvious that the grain size strengthening is important for significant increase in YS of aluminum alloys subjected to ECAP through the three aforementioned TMP routes.…”

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

“…It is obvious that only the combination of grain size strengthening with precipitation hardening can significantly affect the strength of these aluminum alloys. The formation of a UFG microstructure significantly affects the size of second-phase precipitations and their distribution within the aluminum matrix [5][6][7][8][9][10]. Therefore, mechanical properties of age-hardenable aluminum alloys subjected to ECAP depend critically on the aging response including precipitation kinetics and sequence, origin of dispersoids and the precipitate morphology.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the achievement of increased yield stress (YS) in age-hardenable aluminum alloys is not a trivial task. A positive effect of ECAP on YS is reported in a limited number of studies [5,[7][8][9]17,19,20]. It is worth noting that in all these works the temperature of final aging was lower in comparison with aging temperature used to achieve optimal YS in their coarse grained (CG) counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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Abstract:The effect of post-deformation solution treatment followed by water quenching and artificial aging on microstructure and mechanical properties of an Al-Li-Mg-Sc-Zr alloy subjected to equal-channel angular pressing (ECAP) was examined. It was shown that the deformed microstructure produced by ECAP remains essentially unchanged under solution treatment. However, extensive grain refinement owing to ECAP processing significantly affects the precipitation sequence during aging. In the aluminum-lithium alloy with ultrafine-grained (UFG) microstructure, the coarse particles of the S 1 -phase (Al 2 LiMg) precipitate on high-angle boundaries; no formation of nanoscale coherent dispersoids of the δ -phase (Al 3 Li) occurs within grain interiors. Increasing the number of high-angle boundaries leads to an increasing portion of the S 1 -phase. As a result, no significant increase in strength occurs despite extensive grain refinement by ECAP.

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Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging

et al. 2019

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In this study, the age-hardening behavior of severely-deformed and then artificially-aged A2099 Al-Li-Cu alloy has been investigated by Vickers hardness test, tensile test and transmission electron microscopy (TEM). The combined processing of accumulative roll bonding (ARB) and aging treatment at 373 K for 2419 ks resulted in the highest hardness (~190 HV) for the 5-cycled ARB sample with an age-hardenability of 37±2 HV. For the 2-cycled ARB sample with the aging treatment, the ultimate tensile strength and elongation to failure reached 553 MPa and 7%, which are greater than those of the ARB sample without aging treatment (i.e., 442 MPa and 1%). The corresponding TEM microstructures suggested that the refined '-Al 3 Li particles formed by spinodal decomposition are responsible not only for the higher hardness and strength but also for the optimized strength-ductility balance. Therefore, our proposed strategy; i.e. "take advantage of spinodal decomposition", is regarded as a convincing approach to induce nanosized precipitates within ultrafine grains for optimizing the strength-ductility balance.

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ECAP‐Umformung mittel‐ und hochfester ausscheidungshärtbarer Aluminiumknetlegierungen

Hockauf¹,

Schönherr

Wagner

et al. 2009

Materialwissenschaft Werkst

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The study deals with the optimisation of medium-to highstrength aluminium wrought alloys. The goal is to define processing routes in order to improve the mechanical properties if compared to their commercial counterparts. It is shown for the Al-Mg-Si and the Al-Cu-Mg-Si system that the application of ECAP enables a significant increase in strength. The strengthening as well as the grain size reduction respectively, benefit from increasing alloying as well as from the degree of aging. It is also shown that the presence of a considerably fine particulate reinforcement hardens the material tremendously during ECAP. The combination of a pre-or post-ECAP heat treatment enables the improvement of the workability on the one hand, reducing the loads on the die, and also gives a better ductility on the other hand. This positive effect is particularly pronounced for low alloying contents and high aging temperatures and can be attributed to the interaction of deformation induced defects and the precipitation activity. The combination of an appropriate set of ECAP parameters (heat treatment condition, ECAPstrain, -temperature, -backpressure) enables the efficient production of outstanding properties. Due to the low workability of AA7075 (Al-Zn-Mg-Cu system) no significant improvement in properties was achieved.

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Microstructure of the post-ECAP aging processed 6061 Al alloys

Cited by 87 publications

References 15 publications

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging

ECAP‐Umformung mittel‐ und hochfester ausscheidungshärtbarer Aluminiumknetlegierungen

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