Developing Processing Routes for the Equal-Channel Angular Pressing of Age-Hardenable Aluminum Alloys

Duan, Zhi Chao; Chinh, Nguyen Q.; Xu, Cheng; Langdon, Terence G.

doi:10.1007/s11661-009-0020-1

Cited by 36 publications

(23 citation statements)

References 50 publications

(52 reference statements)

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“…By contrast, there have been only a limited number of reports on the pressing of more complex alloys, such as Al-Zn-Mg-(Cu) alloys, where aging treatments and precipitation kinetics become important features of the processing method. [23][24][25][26][27][28][29][30][31][32] In practice, these alloys are often difficult to process by ECAP at room temperature because of their very limited formability.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, if the 7075 alloy is processed in supersaturated state after solution treatment, then the precipitate morphologies are also severely influenced by the pressing operation. [32] Therefore, in the current study, the ECAP processing was conducted in the overaged condition to facilitate the passing through the ECAP die so that large accumulative strains can be introduced. Additionally, it has been reported [33,34] that the presence of overaged secondphase particles favors the structural stability at high temperatures after severe deformation processing, which is of considerable importance for retaining high strength and superplastic characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Processing Severity During Equal-Channel Angular Pressing on the Microstructure of an Al-Zn-Mg-Cu Alloy

Cepeda-Jiménez¹,

García-Infanta²,

Rauch

et al. 2012

Metall Mater Trans A

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A commercial Al-Zn-Mg-Cu alloy, Al 7075, was overaged at 553 K (280°C) for 5 hours and processed by equal-channel angular pressing (ECAP) using route B C . Different temperatures and number of passes, which determine the processing severity, were considered. The processing severity has been estimated by the maximum stress (r Proc ) recorded during each ECAP pass. The higher the number of passes or the lower the processing temperature, i.e., the higher is the processing severity, the finer the (sub)grain size is obtained. A minimum ultrafine (sub)grain size of approximately 150 nm after three passes at 353 K (80°C) or eight passes at 403 K (130°C) was obtained. The microhardness exhibited an instant increase from 76 HV for the overaged initial state to 115 HV after only the first pass. The coarsened precipitates in the overaged alloy lead to larger structural refinement than in pure aluminum.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Processing Severity During Equal-Channel Angular Pressing on the Microstructure of an Al-Zn-Mg-Cu Alloy

Cepeda-Jiménez¹,

García-Infanta²,

Rauch

et al. 2012

Metall Mater Trans A

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show abstract

“…Strong precipitation hardening due to fine precipitation, for example produced by natural ageing of initially solutionised materials, leads to extensive cracking during ECAP processing itself [21,22].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties at room temperature of an Al–Zn–Mg–Cu alloy processed by equal channel angular pressing

Cepeda-Jiménez¹,

García-Infanta²,

Ruano³

et al. 2011

Journal of Alloys and Compounds

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a b s t r a c tTensile tests were conducted to evaluate the influence of equal-channel angular pressing (ECAP) on the mechanical properties at room temperature of overaged Al 7075-O alloy. ECAP processing was performed using route B C at different temperatures and number of passes, i.e. different processing severity conditions. The maximum load (F max ) recorded during the last pass of each ECAP path considered in this study is a very good estimation of the processing severity. The mechanical properties were studied in terms of the balance between tensile strength and ductility. In the processed Al 7075-O alloy, the grain size was reduced down to ∼150 nm. Consequently, tensile testing at room temperature revealed a significant increase in the maximum tensile strength after ECAP with respect to the as start material. In the present study, as the processing severity increases with the number of ECAP passes or with the decrease in processing temperature, there is a consistent trend of increment in ultimate tensile strength with minor decrease in uniform plastic elongation respect to the first ECAP pass at room temperature. This is in contrast to the behaviour after more severe plastic deformation conditions, where an increase in strength together with a strong decrease in elongation would be expected.

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“…This type of strengthening is typical for SPD processed pure Al or Al alloys with microstructure containing high dislocation density and high volume fraction of LAGBs, which can be fabricated via ECAP at room temperature for one to two passes [48][49][50][51][52][53]. Substructures formed through processing at low temperatures are usually referred to as cells.…”

Section: Discussionmentioning

confidence: 99%

Relation between microstructural features and mechanical properties in oxygen free high conductivity copper after Equal-Channel Angular Pressing

KVACKAJ¹,

KOVÁČOVÁ²,

KOČIŠKO³

et al. 2021

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An oxygen free high conductivity (OFHC) copper was subjected to maximum 13 ECAP passes to achieve a sufficiently high degree of deformation. Strength properties (yield stress and ultimate tensile strength) show obvious increase up to the 4 th pass. In the 6 th ECAP pass, the yield stress and ultimate tensile strength are stabilized at a maximum of 449 MPa. Microstructure studies showed that the 1 st ECAP pass caused a significant increase of dislocation density. These dislocations are arranged in cells, forming dense dislocation walls at low-angle subgrains. After the 5 th ECAP pass, well-defined equiaxed ultrafine grains of diameter approximately 500 nm had emerged forming high-angle grain boundaries. The defect density studies carried out by positron annihilation spectroscopy method revealed an increase in a defect density (vacancies, dislocations) up to the 4 th pass, consequently with number of ECAP passes increasing, decrease in defects density (seen by positrons) was observed.K e y w o r d s : dislocation, grain boundaries, equiaxed ultrafine grained microstructure, electron microscopy, Equal Channel Angular Pressing (ECAP)

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Developing Processing Routes for the Equal-Channel Angular Pressing of Age-Hardenable Aluminum Alloys

Cited by 36 publications

References 50 publications

Influence of Processing Severity During Equal-Channel Angular Pressing on the Microstructure of an Al-Zn-Mg-Cu Alloy

Influence of Processing Severity During Equal-Channel Angular Pressing on the Microstructure of an Al-Zn-Mg-Cu Alloy

Mechanical properties at room temperature of an Al–Zn–Mg–Cu alloy processed by equal channel angular pressing

Relation between microstructural features and mechanical properties in oxygen free high conductivity copper after Equal-Channel Angular Pressing

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