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

doi:10.1016/j.ijrmhm.2019.01.019

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

Dept. of Materials Science & Engineering

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

14 Scopus citations

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 language	English
Pages (from-to)	238-242
Number of pages	5
Journal	International Journal of Refractory Metals and Hard Materials
Volume	80
DOIs	https://doi.org/10.1016/j.ijrmhm.2019.01.019
State	Published - Apr 2019

Keywords

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

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10.1016/j.ijrmhm.2019.01.019

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title = "Effect of titanium addition on mechanical properties of Mo-Si-B alloys",

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.",

keywords = "Fracture toughness, High energy ball milling, Mo-Ti-Si-B alloy, Oxygen gettering, Titanium",

author = "Choi, \{Won June\} and Lee, \{Seung Yeong\} and Park, \{Chun Woong\} and Park, \{Jung Hyo\} and Byun, \{Jong Min\} and Kim, \{Young Do\}",

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year = "2019",

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doi = "10.1016/j.ijrmhm.2019.01.019",

language = "English",

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AU - Choi, Won June

AU - Lee, Seung Yeong

AU - Park, Chun Woong

AU - Park, Jung Hyo

AU - Byun, Jong Min

AU - Kim, Young Do

PY - 2019/4

Y1 - 2019/4

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.

KW - Fracture toughness

KW - High energy ball milling

KW - Mo-Ti-Si-B alloy

KW - Oxygen gettering

KW - Titanium

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JO - International Journal of Refractory Metals and Hard Materials

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ER -

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

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Keywords

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