Influence of B contents on the microstructure, fracture toughness and oxidation resistance of Mo-Si-B alloys

Ming Jin, Dingyong He, Wei Shao, Zhen Tan, Xingye Guo, Zheng Zhou, Guohong Wang, Xu Wu, Li Cui, Lian Zhou

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The Mo-10Si-(0, 5, 10, 15)B (at.%) alloys located in Moss (Mo solid solution) +Mo3Si +T2 (Mo5SiB2) region were prepared by arc melting. The effect of B content on the microstructure, microhardness, fracture toughness and oxidation resistance of the alloys was studied. In the Mo-10Si alloy, there are primary Moss and peritectic Mo3Si phases. With the addition of B, (Moss + T2) binary and (Moss + T2 + Mo3Si) ternary eutectics emerge in Mo-10Si-(5, 10)B alloys. For Mo-10Si-15B alloy, primary Moss disappears and the microstructure is only composed of binary and ternary eutectics. With the increase of B content, the proportion and grain size of Moss decrease. The microhardness of alloys increases with the increase of B content due to the increasing intermetallics. The fracture toughness of alloys decreases obviously in single-edge notched three-point bending testing (SENB) and the fracture mode transforms from transgranular fracture to intergranular fracture because of the refinement of Moss. In the high-temperature oxidation test at 1250 °C, the oxidation weight loss of the alloys decreases with the addition of B due to the densification of the borosilicate layer.

Original languageEnglish
Article number161829
JournalJournal of Alloys and Compounds
Volume890
DOIs
StatePublished - 15 Jan 2022
Externally publishedYes

Keywords

  • B content
  • Fracture toughness
  • Microstructure
  • Mo-Si-B alloys
  • Oxidation resistance

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