Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

Chino, Yasumasa; Kishihara, Ryuji; Shimojima, Koji; Hosokawa, Hiroyuki; Yamaguchi, Yasuo; Wen, Cuié; Iwasaki, Hajime; Mabuchi, Mamoru

doi:10.2320/matertrans.43.2437

Cited by 56 publications

(41 citation statements)

References 29 publications

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“…It was shown in the previous work 9) on the solid state recycling of a magnesium alloy that contamination of oxide particles in the solid recycled specimen promotes cavity nucleation, resulting in low elongation of the solid recycled specimen. The inhomogeneous distribution of the oxide particles shown in Fig.…”

Section: à1=2mentioning

confidence: 99%

“…12,13) It should be noted that remelting is not needed for the solid state recycling. In the previous works, [7][8][9] the solid recycled magnesium alloy showed high strength due to microstructural control by the plastic deformation process.…”

Section: Introductionmentioning

confidence: 99%

“…Solid state recycling [7][8][9][10][11][12][13] is one of solutions for such low energy recycling. In the solid state recycling, metal scraps are directly recycled by plastic deformation process such as hot extrusion, [7][8][9][10] forging 11) and BMA (bulk mechanical alloying). 12,13) It should be noted that remelting is not needed for the solid state recycling.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

et al. 2003

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Corrosion and Mechanical properties of a recycled 5083 aluminum alloy by solid state recycling have been compared with those of a virgin extrusion which was processed from the ingot block. In the solid state recycling, the machined chips were extruded at 723 K with an extrusion ratio of 44 : 1 in air. As a result of the salt immersion tests, the mass loss of the solid recycled specimen was not less than twice of that of the virgin extruded specimen. The deterioration in corrosion properties for the solid recycled specimen was attributed to the excessive contamination of iron which promoted galvanic corrosion. As a result of tensile tests, the solid recycled specimen exhibited a good combination of high strength and high elongation to failure at room temperature. The excellent mechanical properties for the solid recycled specimen were attributed to the refined microstructure. However, the elongation to failure of the solid recycled specimen at elevated temperatures more than 573 K was lower than that of the virgin extruded specimen. The contamination of oxide particles is likely to be responsible for the lower elongation in the solid recycled specimen.

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Section: à1=2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

et al. 2003

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“…Recently, a solid-state recycling has been proposed as a new method for magnesium alloy scraps, [7][8][9][10][11][12][13][14][15] where magnesium scraps such as machined chips are directly recycled by hot extrusion without remelting. Because microstructural control such as grain refinement and dispersion of contaminants can be achieved due to severe deformation during recycling, the recycled materials show excellent mechanical properties of high strength, 14) ductility, 11) and superplasticity.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Corrosion Properties of AZ31 Magnesium Alloy Repeatedly Recycled by Hot Extrusion

2006

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Machined chips of a magnesium ally were repeatedly recycled by hot extrusion at 673 K, and mechanical and corrosion properties of the recycled specimens were investigated. At room temperature, the recycled specimen with a high repeated number showed high 0.2% yield stress and high tensile strength but low elongation at room temperature. The main strengthening mechanism of the repeatedly recycled specimen was grain refinement strengthening. Inhomogeneous distribution of oxide contaminants adversely affected the elongation. At elevated temperature, the recycled specimen showed low strength and low elongation as the recycling was repeated. The recycled specimen by a single extrusion exhibited a superior corrosion resistance to the reference specimens. On the other hand, the repeatedly recycled specimen showed poor corrosion properties even though a large amount of oxides is contaminated. The deteriorated corrosion properties are caused by the excessive iron contamination which promotes pitting sites resulting from localized galvanic corrosion sites.

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“…It is also employed as an efficient recycling process. [5][6][7] The wastes, such as machined magnesium chips or crushed in-house magnesium scraps, can be used as input raw materials by the direct hot extruding process. It is reported that solid recycled AZ31 magnesium alloy shows UTS of 268 MPa and 14% elongation, which are the same as those of the virgin extruded alloy.…”

Section: Introductionmentioning

confidence: 99%

Environmentally Benign Fabricating Process of Magnesium Alloy by Cyclical Plastic Working in Solid-State

Kondoh

Aizawa

2003

Mater. Trans.

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Solid-state processing via cyclically plastic working to output the green compact has been developed to fabricate magnesium alloys with fine microstructures. The relationship between the energy consumption during the plastic working and the characteristics of hot extruded magnesium alloys was evaluated from the viewpoint of the environmentally benign process. The cyclical plastic working marks a significant advance in refining microstructures, such as matrix grain and silicon particles added to synthesize Mg 2 Si via solid-state reaction with magnesium. For example, the grain size of hot extruded AZ31 alloy is 3-15 mm, which is remarkably smaller than that with 20-80 mm in employing the cold compact without using such a plastic working. As a result of the grain refinement, AZ31 alloys reveal higher UTS of 330-355 MPa than the conventional alloys of 270 MPa. The energy consumption of the cyclical plastic working with 200 cycles is 10 kJg À1 to fabricate the billet consolidated by hot extrusion, when using a high-speed screw-driven press machine. This is less than 10% of the energy consumed by the conventional recycling process in re-melting wasted magnesium alloys (126 kJg À1 ). This process is highly capable of producing high performance magnesium alloys with a small energy consumption and is environment-friendly.

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Superplasticity and Cavitation of Recycled AZ31 Magnesium Alloy Fabricated by Solid Recycling Process

Cited by 56 publications

References 29 publications

Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

Corrosion and Mechanical Properties of Recycled 5083 Aluminum Alloy by Solid State Recycling

Mechanical and Corrosion Properties of AZ31 Magnesium Alloy Repeatedly Recycled by Hot Extrusion

Environmentally Benign Fabricating Process of Magnesium Alloy by Cyclical Plastic Working in Solid-State

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