Effect of titanium addition on mechanical properties of Mo-Si-B alloys

Won June Choi, Seung Yeong Lee, Chun Woong Park, Jung Hyo Park, Jong Min Byun, Young Do Kim

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In this study, we investigated the effect of titanium addition on microstructure and mechanical properties in Mo-Si-B alloys. The Mo-Ti-Si-B alloy (Mo-3.9Ti-3Si-1B, wt%), which has α-Mo, Mo 3 Si, Mo 5 SiB 2 and TiO 2 phases was fabricated by a powder metallurgy (PM) method. The starting materials were pulverized by using a high-energy ball milling and the resultant powder was subjected to a reduction process followed by cold isostatic pressing (CIP) compaction and pressureless sintering. In the microstructure, intermetallic compound phases were uniformly distributed in the α-Mo matrix. Some titanium atoms solved into the α-Mo matrix and the others formed a TiO 2 phase caused by reaction with oxygen at the grain boundary. Fracture toughness of the Mo-Ti-Si-B sintered body was recorded as 10.42 MPa·m 1/2 , which is lower than that of the Mo-Si-B sintered body without addition of titanium. In the Mo-Ti-Si-B sintered body, the fracture mode is similar to the Mo-Si-B sintered body where intergranular fracture through the Mo grain boundary and transgranular fracture cross the intermetallic compound phase. The decrease of fracture toughness is due to the relatively large TiO 2 at the grain boundary, promoting intergranular fracture.

Original languageEnglish
Pages (from-to)238-242
Number of pages5
JournalInternational Journal of Refractory Metals and Hard Materials
Volume80
DOIs
StatePublished - 2019 Apr 1

Fingerprint

Titanium
Mechanical properties
Grain boundaries
Intermetallics
Fracture toughness
Microstructure
Ball milling
Powder metallurgy
Powders
Compaction
Sintering
Oxygen
Atoms

Keywords

  • Fracture toughness
  • High energy ball milling
  • Mo-Ti-Si-B alloy
  • Oxygen gettering
  • Titanium

Cite this

Choi, Won June ; Lee, Seung Yeong ; Park, Chun Woong ; Park, Jung Hyo ; Byun, Jong Min ; Kim, Young Do. / Effect of titanium addition on mechanical properties of Mo-Si-B alloys. In: International Journal of Refractory Metals and Hard Materials. 2019 ; Vol. 80. pp. 238-242.
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Effect of titanium addition on mechanical properties of Mo-Si-B alloys. / Choi, Won June; Lee, Seung Yeong; Park, Chun Woong; Park, Jung Hyo; Byun, Jong Min; Kim, Young Do.

In: International Journal of Refractory Metals and Hard Materials, Vol. 80, 01.04.2019, p. 238-242.

Research output: Contribution to journalArticleResearchpeer-review

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T1 - Effect of titanium addition on mechanical properties of Mo-Si-B alloys

AU - Choi, Won June

AU - Lee, Seung Yeong

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AU - Park, Jung Hyo

AU - Byun, Jong Min

AU - Kim, Young Do

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N2 - In this study, we investigated the effect of titanium addition on microstructure and mechanical properties in Mo-Si-B alloys. The Mo-Ti-Si-B alloy (Mo-3.9Ti-3Si-1B, wt%), which has α-Mo, Mo 3 Si, Mo 5 SiB 2 and TiO 2 phases was fabricated by a powder metallurgy (PM) method. The starting materials were pulverized by using a high-energy ball milling and the resultant powder was subjected to a reduction process followed by cold isostatic pressing (CIP) compaction and pressureless sintering. In the microstructure, intermetallic compound phases were uniformly distributed in the α-Mo matrix. Some titanium atoms solved into the α-Mo matrix and the others formed a TiO 2 phase caused by reaction with oxygen at the grain boundary. Fracture toughness of the Mo-Ti-Si-B sintered body was recorded as 10.42 MPa·m 1/2 , which is lower than that of the Mo-Si-B sintered body without addition of titanium. In the Mo-Ti-Si-B sintered body, the fracture mode is similar to the Mo-Si-B sintered body where intergranular fracture through the Mo grain boundary and transgranular fracture cross the intermetallic compound phase. The decrease of fracture toughness is due to the relatively large TiO 2 at the grain boundary, promoting intergranular fracture.

AB - In this study, we investigated the effect of titanium addition on microstructure and mechanical properties in Mo-Si-B alloys. The Mo-Ti-Si-B alloy (Mo-3.9Ti-3Si-1B, wt%), which has α-Mo, Mo 3 Si, Mo 5 SiB 2 and TiO 2 phases was fabricated by a powder metallurgy (PM) method. The starting materials were pulverized by using a high-energy ball milling and the resultant powder was subjected to a reduction process followed by cold isostatic pressing (CIP) compaction and pressureless sintering. In the microstructure, intermetallic compound phases were uniformly distributed in the α-Mo matrix. Some titanium atoms solved into the α-Mo matrix and the others formed a TiO 2 phase caused by reaction with oxygen at the grain boundary. Fracture toughness of the Mo-Ti-Si-B sintered body was recorded as 10.42 MPa·m 1/2 , which is lower than that of the Mo-Si-B sintered body without addition of titanium. In the Mo-Ti-Si-B sintered body, the fracture mode is similar to the Mo-Si-B sintered body where intergranular fracture through the Mo grain boundary and transgranular fracture cross the intermetallic compound phase. The decrease of fracture toughness is due to the relatively large TiO 2 at the grain boundary, promoting intergranular fracture.

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KW - Oxygen gettering

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