Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Structural and mechanical properties of Al-0.25Zr alloy obtained on the way of RS ribbons consolidation

Tomasz Tokarski

nr katalogowy: 52734

During the last decade, an extensive research programmes on development of new materials that are capable to meet a constantly rising industry demands were run. Nanotechnology and grain size refinement techniques generated new possibilities in the fields of materials construction. Those novel procedures can be applied to design new products that could meet contradictory requirements, for example material for energy transmission lines. Such materials should be characterized by as high as possible electrical conductivity and specific strength, stable at elevated temperatures [1]. There is always a contradiction between the two, since usually an improvement of one parameter results in decrease of the other. First generation power lines were constructed from aluminum cables reinforced with steel strands. Aluminum has lower electrical conductivity than copper but it is more than compensated by lower density and cost. A direction of further development was to increase the ampacity (current carrying capability). Second generation, self supporting cables, was devoid of steel core. The required strength in order to be able to self support was obtained by addition of alloying elements to aluminum. Mechanical properties were effectively enhanced by solid solution strengthening or precipitation strengthening. Usage of these conventional strengthening mechanisms results in degradation of electrical conductivity as a consequence of the presence of alloying elements in the solute form in the matrix. Total ampacity change is positive due to elimination of steel core and increase of crosssection utilization for carrying the current. Investigations are carried out in order to enhance conductivity while keeping mechanical properties at the highest possible level. In order to meet these requirements, usage of a completely different strengthening mechanism is proposed. It is well known that materials strength increase can be obtained by refinement[...]

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2010-3

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