Influence of Cooling Speed on the Microstructure of Particles Reinforced 7055Al Composites Subject to Regulatory Cryogenic Treatment

Guirong Li; Hong Ming Wang; Yu Hua Cui; Yue Ming Li; Cong Xiang Peng; Pei Si Li; Rui Zheng; Yu Tao Zhao; Yan Jiang

doi:10.4028/www.scientific.net/AMR.941-944.314

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Influence of Cooling Speed on the Microstructure of Particles Reinforced 7055Al Composites Subject to Regulatory Cryogenic Treatment

Abstract:

Al₃Ti and Al₃Zr particles reinforced 7055Al composites were processed by cryogenic treatment with different cooling speed at 1°C/min, 3°C/min and 5°C/min. Transmission Electronic Microscopy (TEM) was mainly used to analyze the microstructural evolution of the treated samples. The results show that with the increase of cooling speed the precipitate amount and dislocation density have been increased. The precipitates orientation exhibits some preferred orientation. The mechanical properties test demonstrates that for the samples treated at 5°C/min the tensile strength and elongation has arrived at the utmost.