Predicting the critical pre-aging time in ECAP processing of age-hardenable aluminum alloys

Roshan, M.R.; Jahromi, S.A. Jenabali; Ebrahimi, R.

doi:10.1016/j.jallcom.2011.05.025

Cited by 32 publications

(16 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unfortunately, despite numerous studies [11][12][13][14][15] dealing with the examination of extensive grain refinement through ECAP on mechanical properties of these precipitation-hardened aluminum alloys, the effect of a UFG microstructure on precipitation sequence under post-deformation aging is relatively poorly known [5,9,[16][17][18]. It was shown that the formation of a UFG microstructure changes the post-deformation aging is relatively poorly known [5,9,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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

Mogucheva

Kaibyshev

2016

Metals

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Mogucheva

Kaibyshev

2016

Metals

View full text Add to dashboard Cite

show abstract

“…Recently, a lot of research activities are focused to improve the strength and ductility of severely deformed age hardenable Al alloys [2,[24][25][26][27][28][29][30][31][32][33]. The effect of post-ECAP low-temperature ageing on the tensile behavior of an Al 10.8 wt pct Ag alloy was studied by Horita et al [24].…”

Section: Introductionmentioning

confidence: 99%

Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy

Panigrahi

Jayaganthan

2011

Journal of Alloys and Compounds

137

View full text Add to dashboard Cite

“…This behavior results from the formation of precipitates in the solution treated Al alloys that leads to loss of deformability of the material. These problems may be avoided by increasing the processing temperature 11,12 , which however, can also bring additional problems such as a larger grain size and additional precipitation, leading to overaging of the material.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Chinh et al 10 developed a strategy for processing these alloys by ECAP at room temperature and found that the pressing may be conducted successfully, without the formation of catastrophic cracking or segmentation, if performed immediately after quenching from the solution treatment temperature or at least within a very short pre-aging time 12,17 . Other authors have processed these alloys in the over aged condition 18 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing

et al. 2012

View full text Add to dashboard Cite

High strength AA7050 aluminum alloy was processed by ECAP through route A in the T7451 condition. Samples were processed at 423 K, with 1 and 3 passes. The resulting microstructure was evaluated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phases were identified by X-ray diffraction (XRD) using monochromatic Cu Kα radiation. Rockwell B hardness and tensile tests were performed for assessment of mechanical properties. The microstructure was refined by the formation of deformation bands, with dislocation cells and elongated subgrains, with an average width of 240 nm, inside these bands. The number of deformation bands increased with the number of passes. A reduction of precipitates size was observed with increase in the number of passes, when compared to initial condition, probably resulting from particle fragmentation during ECAP. After three passes the precipitates tend to a more equiaxed morphology and have sizes smaller than 10 nm. Phases η' and η coexist in the microstructure, but η is the dominant phase, mainly after three passes. The hardness of alloy after the first pass of ECAP is almost equal to the initial condition. After three passes the hardness showed a slight reduction which must be result from recovery process. There was a slight improvement in the yield strength and elongation after one pass, when compared to the initial T7451 condition. The improvement in the ultimate tensile strength was less significant.

show abstract

Predicting the critical pre-aging time in ECAP processing of age-hardenable aluminum alloys

Cited by 32 publications

References 12 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

Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy

Microstructure evolution of AA7050 Al alloy during Equal-Channel Angular Pressing

Contact Info

Product

Resources

About