Masataka Sugiyama1, Hisashi Suzuki1, Takaaki Kido2 and Keizo Morita2
1Department of Metallurgy, Faculty of Engineering, University of Tokyo, Tokyo
The effects of alloying elements and also of annealing treatments on the mechanical properties of Zn-Cu-Ti type alloys contained 0∼ 1.0% Cu and 0∼ 0.30% Ti were mainly investigated. The experimental results were as follows: (1) Alloying element of Cu was thought contributable to strengthen the matrix and to improve the ductility of the alloys, but to have no effect on the heat resisting properties of them. (2) The heat resisting properties were chiefly obtained by additive element of Ti and they appeared to relate to dispersed TiZn15 particles developed in the matrix. (3) Hardness and strength of the alloys were increased by adequate low-temperature annealing, and their high-temperature strength and the creep-rupture properties were also improved by this heat treatment. Annealing temperature to get the best properties was dependent on the content of Ti. The most suitable temperature was ranged from 150° to 180°C for the alloys containing more than about 0.10% of Ti. (4) Mechanical properties of the alloys were not affected by small content of Cr or Mn addition. (5) The most suitable composition range in these wrought Zn-Cu-Ti type alloys was concluded to be 0.4∼ 1.0% Cu and 0.05∼ 0.15% Ti.
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