Formation mechanism of coronal composite secondary phase in titanium-zirconium-molybdenum alloy

Shi Lei Li, Ping Hu, Tong Liu, Qian Shuang Shi, Xiao Ming Dang, Bo liang Hu, Wen Zhang, Kuai She Wang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The coronal composite secondary phase has a high mismatch tolerance with the molybdenum matrix. TiO2 particles located within the coronal structure that provide a semi-coherent interface with a mismatch degree of 8.70%, and ZrO2 particles located outside the coronal structure that provide an incoherent interface with a mismatch degree as high as 41.61%. The ZrO2 particles of the coronal composite secondary phase are partially attached to the TiO2 in a coronal structure, which endows the ZrO2 with the molybdenum matrix's higher interfacial bonding force. Titanium sulfate and zirconium nitrate are realized the mixing of Ti/Zr, TiO2/ZrO2 molecules at atomic levels. Compared with Ti, Zr is more easily combined with oxygen, which leads to Zr in Ti/Zr solid solution being attracted by oxygen at high temperature to form ZrO2. The small addition of zirconium element lacks nucleation particles to form of ZrO2, so ZrO2 can only adhere to more TiO2 particles and nucleate, forming the second phase of the coronal composite structure. This study can guide the design of high-performance secondary phase strengthening alloys.

Original languageEnglish
Article number112235
JournalMaterials Characterization
Volume193
DOIs
StatePublished - Nov 2022
Externally publishedYes

Keywords

  • Coronal composite secondary phase
  • Lattice electron mobility
  • Mismatch
  • Titanium-zirconium-molybdenum alloy

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