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The Effects of Thermo-mechanical Treatment on the Thixoforming Process of Cu-Ca Alloys for High Efficiency Electrical Motors  

Lee, E.Y. (Dept. of Material Science and Engineering, Andong National University)
Kang, B.M. (Korea Institute of Machinery and Materials)
Lee, S.Y. (Korea Institute of Machinery and Materials)
Publication Information
Journal of the Korean Society for Heat Treatment / v.16, no.5, 2003 , pp. 267-274 More about this Journal
Abstract
The effect of the thermo-mechanical treatment on the microstructural development and the electric conductivity of Cu-Ca alloys are studied for the thixoforming processed rotor of the induction motor The Cu-Ca alloys containing Ca less than 1.0wt% show the electrical conductivity higher than 80% IACS They also show broad melting range over $150^{\circ}C$ which is desirable for the thixoforming process The semi-solid microstructure of cast alloy changes from the dendrite structure to globular structure by prior deformation before reheating. The details of microstructural changes by the thermo-mechanical treatment are discussed.
Keywords
Cu rotor; Thixoforming; High conductivity copper alloy; Cu-Ca alloys; TMT(Themomechanical treatment);
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