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Effects of Fe on Microstructures and High-Temperature Compressive Mechanical Properties of Nb-16Si-22Ti-2Cr-2Al-2Hf Based Alloy
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AVIC Beijing Aeronautical Manufacturing Technology Research Institute;Beijing Key Laboratory for Plastic Technology and Equipment,AVIC Beijing Aeronautical Manufacturing Technology Research Institute;Beijing Key Laboratory for Plastic Technology and Equipment,AVIC Beijing Aeronautical Manufacturing Technology Research Institute;Beijing Key Laboratory for Plastic Technology and Equipment,,,AVIC Beijing Aeronautical Manufacturing Technology Research Institute;Beijing Key Laboratory for Plastic Technology and Equipment,,,

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    Abstract:

    Four kinds of multiphase refractory Nb-16Si-22Ti-2Cr-2Al-2Hf-xFe(x=0,1,2,3)alloys were prepared by vacuum arc melting. XRD analysis reveals that the composites consist of Nb solid solution(Nbss), intermetallics Nb3Si and Nb5Si3 phase. The addition of Fe promotes the eutectic reaction L→Nbss+Nb5Si3, which changes the phases of alloy phases from Nbss + Nb3Si to Nbss + Nb5Si3.The volume fraction of ductile phase Nbss increases with increasing of Fe addition, leading to the reduction of compressive strength. Meanwhile, temperature and strain rate also have important influence on compressive strength of the alloys. The addition of Fe element makes Nb-Si based superalloy have better high temperature plastic deformation ability, which is of great significance to improve the hot workability of Nb-Si alloy.

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[Chu Chu, Xu Yanjin, Han Baoshuai, Meng Xianyu, Luo Liangshun, Hou Hongliang, Su Yaning, Guo Jingjie, Fu Hengzhi. Effects of Fe on Microstructures and High-Temperature Compressive Mechanical Properties of Nb-16Si-22Ti-2Cr-2Al-2Hf Based Alloy[J]. Rare Metal Materials and Engineering,2018,47(1):139~145.]
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History
  • Received:November 07,2016
  • Revised:December 14,2016
  • Adopted:January 06,2017
  • Online: February 07,2018

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