ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Relatively high mechanical strength and simultaneously good plasticity of a crystallinematerial are determined by the state of its internal structure, preferably nano- or ultra-fine grainedone. To achieve the above combination of properties, various manners of plastic deformation andheat treatment are applied in practice. One of the most effective processes in this field is severelyplastic deformation, e.g. by the method of equal angular channel pressing (ECAP). During theECAP, favourable effects of grain fragmentation and the formation of specific orientation relationscan be attenuated by the process of structure recovery, especially, when the real temperature ofangular extrusion is elevated for physical or technological reasons.An attempt to modify the ECAP technology was considered, to avoid the unfavourable temperatureeffects and to increase at the same time the efficiency of manufacturing the ultra-fine structure ofmaterial. Extrusion of dual-material (AZ31 + Al) ingot was performed at room temperature. As itseems, the well known difficulties with plastic deformation of materials with hexagonal latticesymmetry, like AZ31 alloy, have been decreased.Both experimental and methodological aspects of the angular extrusion of the dual-material ingotand chosen microstructure characteristics (texture, stress, morphology) are presented. On the basisof the suggested modification, the text discusses an explanation of physical origins of themicrostructure evolution in the investigated material revealed by experiments
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.74.pdf
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