Precipitation behavior of (Mo) phase on dislocations in Mo 5SiB5 phase

Nobuaki Sekido; Ridwan Sakidja; John H. Perepezko

Precipitation behavior of (Mo) phase on dislocations in Mo ₅SiB₅ phase

Nobuaki Sekido, Ridwan Sakidja, John H. Perepezko

ENG - Materials Science

University of Wisconsin-Madison

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

Abstract

The precipitation behavior of a Mo solid solution in a Mo ₅SiB₂(T₂) matrix has been characterized by transmission electron microscopy. The T₂ phase has a distinct range of homogeneity and a temperature dependent solubility range. In order to provide for the homogeneity range of the T₂ phase, a significant concentration of constitutional vacancies has been proposed as a defect mechanism. Upon annealing, the excess vacancies aggregate and collapse into dislocations, which then act as the heterogeneous nucleation sites for the subsequent Mo precipitation. The formation of the preferential variants of precipitates is discussed in terms of the interaction between the transformation strain upon precipitation and the stress fields around dislocations, as well as the crystallographic mismatch between the Mo precipitates and the T₂ matrix.

Original language	English
Pages	357-362
Number of pages	6
Publication status	Published - 2005
Event	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States Duration: 2005 May 29 → 2005 Jun 3

Conference

Conference	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
Country/Territory	United States
City	Phoenix, AZ
Period	05/5/29 → 05/6/3

Keywords

Dislocation
Heterogeneous Nucleation
Precipitation
Vacancy

Cite this

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title = "Precipitation behavior of (Mo) phase on dislocations in Mo 5SiB5 phase",

abstract = "The precipitation behavior of a Mo solid solution in a Mo 5SiB2(T2) matrix has been characterized by transmission electron microscopy. The T2 phase has a distinct range of homogeneity and a temperature dependent solubility range. In order to provide for the homogeneity range of the T2 phase, a significant concentration of constitutional vacancies has been proposed as a defect mechanism. Upon annealing, the excess vacancies aggregate and collapse into dislocations, which then act as the heterogeneous nucleation sites for the subsequent Mo precipitation. The formation of the preferential variants of precipitates is discussed in terms of the interaction between the transformation strain upon precipitation and the stress fields around dislocations, as well as the crystallographic mismatch between the Mo precipitates and the T2 matrix.",

keywords = "Dislocation, Heterogeneous Nucleation, Precipitation, Vacancy",

author = "Nobuaki Sekido and Ridwan Sakidja and Perepezko, {John H.}",

year = "2005",

language = "English",

pages = "357--362",

note = "International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 ; Conference date: 29-05-2005 Through 03-06-2005",

}

TY - CONF

T1 - Precipitation behavior of (Mo) phase on dislocations in Mo 5SiB5 phase

AU - Sekido, Nobuaki

AU - Sakidja, Ridwan

AU - Perepezko, John H.

PY - 2005

Y1 - 2005

N2 - The precipitation behavior of a Mo solid solution in a Mo 5SiB2(T2) matrix has been characterized by transmission electron microscopy. The T2 phase has a distinct range of homogeneity and a temperature dependent solubility range. In order to provide for the homogeneity range of the T2 phase, a significant concentration of constitutional vacancies has been proposed as a defect mechanism. Upon annealing, the excess vacancies aggregate and collapse into dislocations, which then act as the heterogeneous nucleation sites for the subsequent Mo precipitation. The formation of the preferential variants of precipitates is discussed in terms of the interaction between the transformation strain upon precipitation and the stress fields around dislocations, as well as the crystallographic mismatch between the Mo precipitates and the T2 matrix.

AB - The precipitation behavior of a Mo solid solution in a Mo 5SiB2(T2) matrix has been characterized by transmission electron microscopy. The T2 phase has a distinct range of homogeneity and a temperature dependent solubility range. In order to provide for the homogeneity range of the T2 phase, a significant concentration of constitutional vacancies has been proposed as a defect mechanism. Upon annealing, the excess vacancies aggregate and collapse into dislocations, which then act as the heterogeneous nucleation sites for the subsequent Mo precipitation. The formation of the preferential variants of precipitates is discussed in terms of the interaction between the transformation strain upon precipitation and the stress fields around dislocations, as well as the crystallographic mismatch between the Mo precipitates and the T2 matrix.

KW - Dislocation

KW - Heterogeneous Nucleation

KW - Precipitation

KW - Vacancy

UR - http://www.scopus.com/inward/record.url?scp=33645229136&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33645229136&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:33645229136

SP - 357

EP - 362

T2 - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005

Y2 - 29 May 2005 through 3 June 2005

ER -

Precipitation behavior of (Mo) phase on dislocations in Mo ₅SiB₅ phase

Abstract

Conference

Keywords

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