Effect of Ti and Si Additions on Microstructure, Fracture Toughness and Oxidation Resistance of Nb-Mo5SiB2 Composite

Xiaohui Lin; Guojun Zhang; Laiping Li; Yan Liu; Yanchao Li; Bin Li; Wen Zhang

doi:10.1007/s11837-021-04868-8

Effect of Ti and Si Additions on Microstructure, Fracture Toughness and Oxidation Resistance of Nb-Mo₅SiB₂ Composite

Xiaohui Lin, Guojun Zhang, Laiping Li, Yan Liu, Yanchao Li, Bin Li, Wen Zhang

Research output: Contribution to journal › Article › peer-review

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Abstract

Nb-Mo₅SiB₂ (T2)-based composites with Ti and Si additions were prepared by mechanical alloying followed by hot pressing. The phase analysis revealed that element additions induced the phase composition change. In the Ti-added Nb-T2 composite, Ti was distributed in the grain boundary as sub-micron Ti-rich oxide particles due to insufficient oxidation. The addition of Si turned the Nb-T2 into a complete intermetallic composite by forming Nb-silicide. The mechanical properties showed that Ti- and Si-co-added Nb-T2 composite had the highest hardness (1939 HV) and compressive strength (3445 MPa), while the Ti-added Nb-T2 composite exhibited the best toughening effect, and the fracture toughness reached 13.37 MPa m^1/2, which were about 31% and 300% higher than that of Nb-T2 and pure polycrystalline T2, respectively. Although the Nb and Ti had excellent toughening effect on the T2 phase, it worsened the oxidation resistance of the composites.

Original language	English
Pages (from-to)	3476-3485
Number of pages	10
Journal	JOM
Volume	73
Issue number	11
DOIs	https://doi.org/10.1007/s11837-021-04868-8
State	Published - Nov 2021
Externally published	Yes

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title = "Effect of Ti and Si Additions on Microstructure, Fracture Toughness and Oxidation Resistance of Nb-Mo5SiB2 Composite",

abstract = "Nb-Mo5SiB2 (T2)-based composites with Ti and Si additions were prepared by mechanical alloying followed by hot pressing. The phase analysis revealed that element additions induced the phase composition change. In the Ti-added Nb-T2 composite, Ti was distributed in the grain boundary as sub-micron Ti-rich oxide particles due to insufficient oxidation. The addition of Si turned the Nb-T2 into a complete intermetallic composite by forming Nb-silicide. The mechanical properties showed that Ti- and Si-co-added Nb-T2 composite had the highest hardness (1939 HV) and compressive strength (3445 MPa), while the Ti-added Nb-T2 composite exhibited the best toughening effect, and the fracture toughness reached 13.37 MPa m1/2, which were about 31% and 300% higher than that of Nb-T2 and pure polycrystalline T2, respectively. Although the Nb and Ti had excellent toughening effect on the T2 phase, it worsened the oxidation resistance of the composites.",

author = "Xiaohui Lin and Guojun Zhang and Laiping Li and Yan Liu and Yanchao Li and Bin Li and Wen Zhang",

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doi = "10.1007/s11837-021-04868-8",

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T1 - Effect of Ti and Si Additions on Microstructure, Fracture Toughness and Oxidation Resistance of Nb-Mo5SiB2 Composite

AU - Lin, Xiaohui

AU - Zhang, Guojun

AU - Li, Laiping

AU - Liu, Yan

AU - Li, Yanchao

AU - Li, Bin

AU - Zhang, Wen

PY - 2021/11

Y1 - 2021/11

N2 - Nb-Mo5SiB2 (T2)-based composites with Ti and Si additions were prepared by mechanical alloying followed by hot pressing. The phase analysis revealed that element additions induced the phase composition change. In the Ti-added Nb-T2 composite, Ti was distributed in the grain boundary as sub-micron Ti-rich oxide particles due to insufficient oxidation. The addition of Si turned the Nb-T2 into a complete intermetallic composite by forming Nb-silicide. The mechanical properties showed that Ti- and Si-co-added Nb-T2 composite had the highest hardness (1939 HV) and compressive strength (3445 MPa), while the Ti-added Nb-T2 composite exhibited the best toughening effect, and the fracture toughness reached 13.37 MPa m1/2, which were about 31% and 300% higher than that of Nb-T2 and pure polycrystalline T2, respectively. Although the Nb and Ti had excellent toughening effect on the T2 phase, it worsened the oxidation resistance of the composites.

AB - Nb-Mo5SiB2 (T2)-based composites with Ti and Si additions were prepared by mechanical alloying followed by hot pressing. The phase analysis revealed that element additions induced the phase composition change. In the Ti-added Nb-T2 composite, Ti was distributed in the grain boundary as sub-micron Ti-rich oxide particles due to insufficient oxidation. The addition of Si turned the Nb-T2 into a complete intermetallic composite by forming Nb-silicide. The mechanical properties showed that Ti- and Si-co-added Nb-T2 composite had the highest hardness (1939 HV) and compressive strength (3445 MPa), while the Ti-added Nb-T2 composite exhibited the best toughening effect, and the fracture toughness reached 13.37 MPa m1/2, which were about 31% and 300% higher than that of Nb-T2 and pure polycrystalline T2, respectively. Although the Nb and Ti had excellent toughening effect on the T2 phase, it worsened the oxidation resistance of the composites.

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DO - 10.1007/s11837-021-04868-8

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SN - 1047-4838

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JO - JOM

JF - JOM

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ER -

Effect of Ti and Si Additions on Microstructure, Fracture Toughness and Oxidation Resistance of Nb-Mo₅SiB₂ Composite

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