Effects of Semi-solid Isothermal Heat Treatment on Microstructures and Damping Capacities of Fly Ash Cenosphere/AZ91D Composites
来源期刊：Acta Metallurgica Sinica2018年第9期
论文作者：En-Yang Liu Si-Rong Yu Ming Yuan Fan-Guo Li Yan Zhao Wei Xiong
文章页码：953 - 962
摘 要：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 9 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.
En-Yang Liu1,2，Si-Rong Yu1，Ming Yuan1，Fan-Guo Li1，Yan Zhao1，Wei Xiong1
1. College of Mechanical and Electrical Engineering,China University of Petroleum(East China)2. Key Laboratory of Oil and Gas Equipment of Education Ministry,Southwest Petroleum University
摘 要：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 9 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.
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