Influence of preliminary extrusion conditions on the superplastic properties of a magnesium alloy processed by ECAP

Furui, Mitsuaki; Kitamura, Hiroki; Anada, Hiroshi; Langdon, Terence G.

doi:10.1016/j.actamat.2006.09.027

Cited by 129 publications

(73 citation statements)

References 36 publications

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“…1[a] are taken from various reports for Al alloys, [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and in Fig. 1 [b] there are similar sets of data for a range of Mg alloys [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] where the upper solid lines in Figs 1[a] and [b] show the predicted normalized strain rates derived using eq. [2].…”

Section: Introductionmentioning

confidence: 94%

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The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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Metals processed by severe plastic deformation [SPD] techniques, such as equal-channel angular pressing [ECAP] and high-pressure torsion [HPT], generally have submicrometer grain sizes. Consequently, they exhibit high strength as expected on the basis of the HallPetch [H-P] relationship. Examples of this behavior are discussed using data on Ti, Al-Mg 1 and Ni. These materials typically have grain size above ~50 nm where softening is not expected. An increase in strength is usually accompanied by a decrease in ductility. High strength and ductility can be achieved simultaneously by imposing high strains to give both ultrafine grain sizes and a high fraction of high-angle grain boundaries. An example is presented for a cast Al-7% Si alloy processed by HPT. In some cases, SPD may produce a fine grain size but also lead to a weakening due to microstructural changes as in ECAP of an Al-7034 alloy and HPT of Zn-22% Al. In SPD-processed materials, grain boundary segregation and nanostructural features are present which may lead to higher strengths than those predicted by the H-P relationship in some alloys having nano grain sizes.

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Section: Introductionmentioning

confidence: 94%

“…Figure. 1b. Effect of grain size on superplastic strain rate in Mg alloys; [7] datum points for ECAP [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] and HPT. [46][47][48][49] Figure 2.…”

Section: Figure Captionsmentioning

confidence: 99%

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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“…17) Initial experiments showed that the alloy cracked after a single pass when pressing at room temperature using a die with a channel angle of…”

Section: Examples Of Advanced Properties Achieved In Magnesium Alloysmentioning

confidence: 99%

Achieving Microstructural Refinement in Magnesium Alloys through Severe Plastic Deformation

Figueiredo

Langdon

2009

Mater. Trans.

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Equal-channel angular pressing (ECAP) is an excellent processing tool for achieving exceptional grain refinement, typically to the submicrometer level, in a range of pure metals and metallic alloys. Although processing by ECAP is relatively straight-forward when using soft metals, the processing becomes more difficult when using magnesium-based alloys and other similar difficult-to-work materials. This overview examines the procedures that must be adopted for the successful processing of these materials and then describes some of the advanced properties achieved after the successful processing of two magnesium alloys.

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“…• , but if the material was pressed through the die at a larger angle, several passages were performed without disrupting its integrity [12]. Another example, the study [13], indicates that the pressing of an Mg alloy (ZK60) through a die at an angle of 90…”

Section: Introductionmentioning

confidence: 99%

FEA of Plastic Flow in AZ63 Alloy during ECAP Process

2012

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Magnesium alloys based on MgAlZn system are very attractive materials in many industries due to their specic properties. One of common forming manners suitable for this kind of material is the application of severe plastic deformation method. This paper is focused on the deformation behavior of AZ63 alloy at equal channel angular pressing process in the temperature range of 250320• C. For this purpose nite element analysis was used. Main attention was devoted to the inuence of processing parameters on the material ow. Among other, changes of the ow during equal channel angular pressing in chosen regions of the pressed samples were monitored. As variables, temperature, friction coecient, strain rate, φ-angle or back pressure application were chosen. The comparison of the material ow lines at dierent conditions shows the aecting of material ow. There are obvious considerable dierences between regions adjacent to the inner radius and those adjacent to the outer radius. For example in the case µ = 0 the dead zone is delimited by the angle Ψ = 36• , while in the case of friction given by the coecient µ = 0.04, the value of the angle was Ψ = 26.5• .

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Influence of preliminary extrusion conditions on the superplastic properties of a magnesium alloy processed by ECAP

Cited by 129 publications

References 36 publications

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Achieving Microstructural Refinement in Magnesium Alloys through Severe Plastic Deformation

FEA of Plastic Flow in AZ63 Alloy during ECAP Process

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