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1

Developing Superplasticity in Ultrafine-Grained Metals

100%

Kawasaki M., Langdon T.

Acta Physica Polonica A

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2015

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vol. 128

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issue 4

470-478

EN

The processing of bulk metals through the application of severe plastic deformation provides an opportunity for achieving exceptional grain refinement with grain sizes typically lying in the submicrometer or even the nanometer range. Provided these small grains are reasonably stable at elevated temperatures, these ultrafine-grained metals will exhibit excellent superplastic properties when pulled in tension at elevated temperatures. Most ultrafine-grained materials have been produced using either equal-channel angular pressing or high-pressure torsion. This paper examines the results for superplasticity reported to date using metallic alloys processed by equal-channel angular pressing and high-pressure torsion, compares the experimental strain rates with those predicted using the theoretical model for conventional superplastic flow and then demonstrates the feasibility of preparing deformation mechanism maps that provide comprehensive information on the flow mechanisms.

2

An Evaluation of Homogeneity and Heterogeneity in Metals Processed by High-Pressure Torsion

81%

Figueiredo R., Kawasaki M., Langdon T.

Acta Physica Polonica A

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2012

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vol. 122

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issue 3

425-429

EN

Processing through the use of high-pressure torsion is attracting much attention at the present time because of the potential for achieving exceptional grain refinement. In principle, it appears that the thin disks used for high-pressure torsion processing should exhibit significant heterogeneity in the as-processed condition. However, experiments show that the development of homogeneity or heterogeneity is dependent upon the crystalline structure of the material. For high-purity aluminum the as-processed microstructure is very homogeneous after five or more revolutions of torsional straining but for the magnesium AZ31 alloy there is a considerable degree of heterogeneity in the as-processed disks.

3

High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion

81%

Ahn B., Oh M. C., Kawasaki M., Lee H.-J.

Archives of Metallurgy and Materials

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2015

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issue 2

4

Evolution Of Precipitate Morphology During Extrusion In Mg ZK60A Alloy

71%

Park J., Ahn B., Jung K. H., Lee G. A., Kawasaki M.

Archives of Metallurgy and Materials

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2015

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issue 2

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2 Acta Physica Polonica A

2 Archives of Metallurgy and Materials

3 2015

1 2012

4 Kawasaki M.

2 Ahn B.

2 Langdon T.

1 Figueiredo R.

1 Jung K. H.

1 Lee G. A.

1 Lee H.-J.

1 Oh M. C.

1 Park J.

Developing Superplasticity in Ultrafine-Grained Metals

An Evaluation of Homogeneity and Heterogeneity in Metals Processed by High-Pressure Torsion

High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion

Evolution Of Precipitate Morphology During Extrusion In Mg ZK60A Alloy