Morphology-Free Processing of Magnesium Alloys

Kondoh, Katsuyoshi; Luangvaranunt, Tachai; Aizawa, Tatsuhiko

doi:10.2320/matertrans.42.1254

Cited by 16 publications

(12 citation statements)

References 2 publications

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“…For example, hot forged AZ91D magnesium alloy consolidated from its chips shows a UTS of 280 MPa, which is remarkably higher than the conventional wrought AZ91D. 11,12) This process also highly capable of producing copper, 10) aluminum 13,14) and magnesium alloys without causing harm to the environment. In applying this process to the mass production process in industries, however, high productive efficiency is required.…”

Section: Introductionmentioning

confidence: 99%

“…From the viewpoint of not only the energy consumption, but also the microstructural control of the green compacts, the number of cycles in BMA, N, is an important factor. 11) In applying the BMA process to the refinement of AZ91D chips including networked Mg 17 Al 12 intermetallics and lamellar chips, the input raw chips show a micro-hardness of 77 Hv at the matrix. After 500 cycles of BMA, it reaches 139 Hv.…”

Section: Bulk Mechanical Alloying (Bma)mentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Bulk Mechanical Alloying (Bma)mentioning

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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“…12), grain size refinement by the in-process microstructure control can afford to open the ways to make full use of the sub-micron sized and nano-structured materials in practice and to accommodate the high-strain-rate and the low-temperature superplastic forming as an innovative EBM. Solid-state recycling 10,11) is also a promising approach to make in-process microstructure for high qualification.…”

Section: High Performance For Long Term Usementioning

confidence: 99%

“…Since fine grain size and well-tailored microstructure can be yielded via the solid-state recycling, high strengthening can be attained inprocess together with high ductility or superplasticity. 11,12) This break-through from the normal trade-off-balancing between strength and ductility is essential in the upgrade recycling of magnesium and aluminum alloys.…”

Section: Light Weight Materials Selectionmentioning

confidence: 99%

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Critical Issues in Promotion of Environmentally Benign Manufacturing and Materials Processing

2002

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Regional differences on the strategy against crisis to environment make a common frame invisible to promote the effective directions toward significant reduction of total mass requirement or dematerialization. This overview summarizes the intimate discussions, proposals and advisable comments at the first US-Japan Workshop on the Environmentally Benign Manufacturing and Materials Processing at Hawaii on the October 5th, 2001, in order to integrate the state-of-the-art research activities in both countries. In the discussion over the recyclable materials, value/cost-quality diagram is used to redefine the recycling process and to characterize various processes in the environmentally benign manufacturing. Influence of light-weight material selection on the dematerialization is discussed to find out a new direction. Importance of the trade-off-balancing on the high performance for long term use is reconsidered to search for a solution in the design of innovative manufacturing and materials processing. Mass flow analysis in the life cycle assessment is recognized as a tool to make eco-system design for industrial ecology. Several issues for further research are also argued to promote the related activities to the environmentally benign manufacturing and materials processing.

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