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Dissolution and Precipitation Behaviors of Silicides and Their Effects on Tensile properties of Ti-38644 Alloy
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Institute of Metal Research,Chinese Academy of Science,Institute of Metal Research,Chinese Academy of Science,Institute of Metal Research,Chinese Academy of Science,Institute of Metal Research,Chinese Academy of Science,Institute of Metal Research,Chinese Academy of Science,Institute of Metal Research,Chinese Academy of Science

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    Abstract:

    The dissolution and precipitation behaviors of silicides and their influence on the microstructure and tensile properties of Ti-38644 titanium alloy were investigated. Microstructure characteristics and tensile fracture mode were observed by means of OM, SEM and TEM. The results showed that trace impurity Si promote the formation of (TiZr)6Si3 silicides. Silicide gradually dissolved when the alloy was solution treated at 700~900 ℃. No silicides were observed after the alloy was solution treated at 950 ℃. The strength of the alloy decreased with increasing solution temperature in the range of 800~950 ℃ due to the dissolution of silicides and the growth of β grians. When the alloy was solution treated at 1100 ℃ and aged at 750~900 ℃ for 1 h, silicides precipitated at grain boundaries. No grain boundary silicides were observed after the alloy was aged at 700 ℃ and 950 ℃. Grain boundary silicides had little influence on the strength, but decreased its plasticity significantly, the tensile fracture mode was mainly intergranular fracture.

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[Ba Hongbo, Dong Limin, Zhang Zhiqiang, Wang Haizhong, Xu Dongsheng, Yang Rui. Dissolution and Precipitation Behaviors of Silicides and Their Effects on Tensile properties of Ti-38644 Alloy[J]. Rare Metal Materials and Engineering,2017,46(S1):5~10.]
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History
  • Received:May 11,2016
  • Revised:May 11,2016
  • Adopted:August 08,2017
  • Online: December 13,2017