Developing superplasticity in a magnesium alloy through a combination of extrusion and ECAP

Matsubara, Kiyoshi; Miyahara, Yuto; Horita, Zenji; Langdon, Terence G.

doi:10.1016/s1359-6454(03)00118-6

Cited by 367 publications

(182 citation statements)

References 39 publications

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“…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%

“…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: 99%

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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: Figure Captionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Strength–Grain Size Relationship in Ultrafine-Grained Metals

Balasubramanian

Langdon

2016

Metall Mater Trans A

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“…This procedure of ''extrusion plus ECAP'' was designated EX-ECAP 10) and experiments have shown it works well in producing significant grain refinement in many magnesium alloys. [11][12][13] However, despite this success there remains a problem that many magnesium alloys fail during processing through the development of substantial cracking or segmentation.…”

Section: )mentioning

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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“…Ultrafine grained (UFG) metals and alloys processed by severe plastic deformation (SPD) techniques have been reported to have superior mechanical properties, such as high strength with good ductility and excellent superplasticity at lower temperature and higher strain rates [1][2][3]. Among all the SPD techniques, equal channel angular pressing (ECAP) is especially attractive because it can economically produce bulk UFG materials that are 100% dense, contamination free and large enough for real structural applications.…”

Section: Introductionmentioning

confidence: 99%