Effects of Semi-solid Isothermal Heat Treatment on Microstructures and Damping Capacities of Fly Ash Cenosphere/AZ91D Composites

doi:10.1007/s40195-018-0722-8

Abstract

Abstract:

The fly ash cenosphere/AZ91D composites were successfully prepared and isothermally heat-treated at different temperatures for different time. The effects of semi-solid isothermal heat treatment on the microstructures and damping capacities of fly ash cenosphere/AZ91D composites were investigated. With the increase in isothermal temperature or holding time, the small liquid droplets within grains increased in size but decreased in quantity. The average size and shape factor of Mg₂Si particles increased with the rise of isothermal temperature. The damping capacities of the composites were improved by isothermal heat treatment. At room temperature, the composites after heat treatment at 520 and 550 °C had a higher damping capacity due to interface damping when the strain amplitude was lower than about 8.8×10^-5, and the composite after heat treatment at 580 °C had a better damping capacity because of the dislocation damping under the condition of high strain amplitude. The damping capacities of the composites increased with the rise of the test temperature, and the damping mechanisms varied depending on different test temperatures. The interface damping played an important role when the test temperature was below about 100 °C, and the dislocation damping and grain boundary damping took effect with the rise of test temperature.

Key words: Fly ash cenosphere, Magnesium matrix composite, Semi-solid isothermal heat treatment, Microstructural evolution, Damping capacity

En-Yang Liu, Si-Rong Yu, Ming Yuan, Fan-Guo Li, Yan Zhao, Wei Xiong. Effects of Semi-solid Isothermal Heat Treatment on Microstructures and Damping Capacities of Fly Ash Cenosphere/AZ91D Composites[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(9): 953-962.

Figures/Tables 13

Table 1 Chemical composition of AZ91D magnesium alloy

Element	Al	Zn	Mn	Si	Cu	Fe	Ni	Mg
Mass fraction (%)	9.03	0.66	0.20	0.038	0.0016	0.0026	0.00078	Bal.

Fig. 1 Morphology of pretreated FAC and EDS result.

Fig. 2 Schematic diagram of the facility used to prepare FAC/AZ91D composite.

Fig. 3 DTA heating curve of the as-cast FAC/AZ91D composite.

Fig. 4 XRD patterns of AZ91D alloy and FAC/AZ91D composite.

Fig. 5 Microstructure of as-cast FAC/AZ91D composite (a) and a larger magnification of Mg17Al12 (b) .

Fig. 6 Semi-solid microstructures of FAC/AZ91D composites after isothermal heat treatment at different temperatures and held for 40 min: a 520 °C, b 550 °C, c 570 °C, d 580 °C.

Fig. 7 Variations of the average size and shape factor of Mg2Si particles treated at different temperatures for 40 min.

Fig. 8 Semi-solid microstructures of FAC/AZ91D composites after isothermal heat treatment at 570 °C for a 50 min, b 60 min, c 120 min.

Fig. 9 Variations of the damping capacities with strain amplitude at room temperature of FAC/AZ91D composites after heat treatment at different temperatures for 40 min.

Fig. 10 G-L plots for FAC/AZ91D composites after isothermal heat treatment at different temperatures for 40 min.

Table 2 Values of parameters obtained from G-L plots of FAC/AZ91D composites after isothermal heat treatment at different temperatures

Temperature (°C)	C₁ (×10^-6)	C₂ (×10^-4)
As-cast	12.6723	1.2497
520	12.9321	1.1333
550	13.2349	1.1506
570	13.5510	1.2169
580	17.0485	1.3713

Fig. 11 Temperature-dependent damping capacities of FAC/AZ91D composites after heat treatment at different temperatures for 40 min.

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