Wyniki wyszukiwania - BazTech

1

Nanostructured metals - processing, microstructure and properties.

Hansen N., Jensen D.J.

Inżynieria Materiałowa

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2001

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R. XXII, nr 5

1006-1011

EN

Nanostructured metals and alloys processed by plastic deformation are described with emphasis on their structural evolution and on correlations between structure and mechanical properties. Various processes are considered both conventional ones (e.g. rolling, drawing and torsion) and new ones (e.g. accumulative roll bonding, cyclic extrusion compression and equal channel angular extrusion). For all these processes it is a general finding that the structure evolves by subdivision of grains by deformation induced boundaries forming a cell block structure, which refines with increasing strain. A number of structural parameters are defined and analysed leading to qualitative and quantitative correlations between processing parameters and structure and between structural parameters and mechanical properties.

2

Microtexture and microstructure investigations by orientation imaging microscopy.

Bunsch A., Jensen D.J., Hansen N.

Inżynieria Materiałowa

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1998

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R. XIX, nr 3

455-458

EN

The OIM technique is presented and examples of OIMs from recrystallized and cold deformed aluminium are given. It was found that the grain structures of the recrystallized samples are well resolved by the OIMs. Grain subdivision on different length scales during deformation is also clearly visible. The development in orientational grain subdivision is followed as a function of strain up to Epsilon=0.8 and the results are presented both by OIM pictures, average misorientations and misorientation distributions. Finally the potentials of the OIM technique are discussed.

3

Microstructure and properties of deformed metals.

Hansen N.

Inżynieria Materiałowa

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1998

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R. XIX, nr 3

108-115

EN

Introduction of advanced, automated technique in the characterization of microstructures has led to new insight in the formation and evolution of deformation microstructures during thermomechanical processing of metals. These new techniques have also allowed an accurate determination of microstructural parameters which are used in an analysis of the effect of metals and process parameters on the properties of a deformed metal.

4

Formation of fine grains in aluminium deformed to large strains.

Richert M., Hansen N., Richert J., Jensen D.J., Liu Q., Godfrey A.

Inżynieria Materiałowa

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1998

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R. XIX, nr 3

502-505

EN

Pure aluminium (99,992%) deformed to large strains by CEC method has been annealed in the temperature range from 373 to 563 K. After annealing at 513 K a partly recrystallized microstructure with small grains is observed. An analysis of the changes in microstructure suggests that both discontinuous and continuous recrystallization might have taken place.