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2 Archives of Materials Science and Engineering

2 2007

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Microstructure and behaviour of ZC63 alloy and composite

100%

Trojanová Z. , Lukáč P.

2007

tom Vol. 28, nr 9

541-548

Purpose: of this paper is to study the damping behaviour of ZC63 magnesium alloy and the same alloy reinforced with short Saffil fibres. Design/methodology/approach: Samples were thermally cycled between room temperature and increasing upper temperature of the thermal cycle and the logarithmic decrement were measured at room temperature. Findings: The strain amplitude dependence of the logarithmic decrement can be divided to two components: the amplitude independent and the amplitude dependent. While the thermal treatment does not change the amplitude independent component, the amplitude dependent part increases with increasing upper temperature of the thermal cycle. Research limitations/implications: Redistribution of solute atoms during thermal cycles is the reason for the observed changes in the amplitude dependence of decrement. Thermal stresses arise in the composite at the interfaces between the matrix and the reinforcement owing to a considerable mismatch of the thermal expansion coefficients of the matrix and that of the reinforcement. Practical implications: The ZC63/Saffil composites may be used as damping materials. Originality/value: New results on the damping behaviour of ZC63 alloy and its composite including internal friction were obtained.

Deformation behaviour of ZC63 magnesium matrix composite

100%

Trojanová Z. , Lukáč P.

2007

tom Vol. 28, nr 6

361-364

Purpose: of this paper is to give information on the deformation behaviour of ZC63 magnesium alloys reinforced with 10 vol. % of SiC particles. Design/methodology/approach: The deformation behaviour of the ZC63/10SiCp composite was investigated in tensile tests over the temperature range from 23 to 200 °C at an initial strain rate of 8.3 x 10 -3 s -1. Findings: The flow stress decreases with increasing temperature. Both the yield stress and the maximum stress decrease with increasing temperature for temperatures higher than 100 °C. Research limitations/implications: The paper indicates significant softening mechanisms that take place at high temperature deformation. Practical implications: The ZC63/10SiCp composite may be used for applications at temperatures above 100 C. Originality/value: New results on the temperature dependence of the yield stress and maximum stress were obtained.