Effect of post equal-channel-angular-pressing aging on the modified 7075 Al alloy containing Sc

Kim, W.J.; Kim, J.K.; Kim, H.K.; Park, J.W.; Jeong, Yong-Jin

doi:10.1016/j.jallcom.2006.10.151

Cited by 63 publications

(45 citation statements)

References 14 publications

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“…As a result, uniform elongation does not exceed 3%-5% [7,17]. It was shown that it is possible to increase strength by ECAP with ductility remaining essentially unchanged [19]. However, even in this case, the uniform elongations in an Sc modified AA7055 aluminum alloy subjected to T6 heat treatment were much larger (~15% vs. 2%-3%) in comparison with the material subjected to ECAP processing.…”

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 98%

“…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%

“…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%

“…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: 98%

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

Section: Ecap Processing Of Age Hardenable Aluminum Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 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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“…The increase of strength is due to grain-refinement processes into the sub-micrometer range. In regions of high dislocation densities, low-angle grain boundaries are formed and then further transformed into high-angle grain boundaries, which leads to a reduction of grain size by cold work [8][9][10]. ECAP processing has been used to increase the strength of various age hardening aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Natural Aging Prior to Low Temperature ECAP of a High-Strength Aluminum Alloy

Fritsch

Wagner

2018

Metals

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Severe plastic deformation (SPD) can be used to generate ultra-fine grained microstructures and thus to increase the strength of many materials. Unfortunately, high strength aluminum alloys are generally hard to deform, which puts severe limits on the feasibility of conventional SPD methods. In this study, we use low temperature equal-channel angular pressing (ECAP) to deform an AA7075 alloy. We perform ECAP in a custom-built, cooled ECAP-tool with an internal angle of 90 • at −60 • C and with an applied backpressure. In previous studies, high-strength age hardening aluminum alloys were deformed in a solid solution heat treated condition to improve the mechanical properties in combination with subsequent (post-ECAP) aging. In the present study, we systematically vary the initial microstructure-i.e., the material condition prior to low temperature ECAP-by (pre-ECAP) natural aging. The key result of the present study is that precipitates introduced prior to ECAP speed up grain refinement during ECAP. Longer aging times lead to accelerated microstructural evolution, to increasing strength, and to a transition in fracture behavior after a single pass of low temperature ECAP. These results demonstrate the potential of these thermo-mechanical treatments to produce improved properties of high-strength aluminum alloys.

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Equal‐Channel Angular Pressing (ECAP)

Ravisankar

2015

Handbook of Mechanical Nanostructuring

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Effect of post equal-channel-angular-pressing aging on the modified 7075 Al alloy containing Sc

Cited by 63 publications

References 14 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

On the Effect of Natural Aging Prior to Low Temperature ECAP of a High-Strength Aluminum Alloy

Equal‐Channel Angular Pressing (ECAP)

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