Synthesis and properties of Mo5Si3 single crystals

F. Chu, D. J. Thoma, K. McClellan, Pedro Peralta, Y. He

Research output: Contribution to journalArticle

89 Citations (Scopus)

Abstract

The ultra-high temperature structural intermetallic Mo5Si3 has been studied for alloy processing, physical properties, and mechanical behavior. High purity single crystals of Mo5Si3 have been synthesized by both optical floating zone and Czochralski methods. Structural, thermal, and elastic properties of Mo5Si3 single crystals were measured by X-ray powder diffraction, thermal mechanical analysis, and resonant ultrasound spectroscopy, respectively. Results show that the thermal expansion of Mo5Si3, a tetragonal structure with I4/mcm symmetry, is strongly anisotropic along the a and c directions with αca = 2.2. Single crystal elastic moduli of Mo5Si3 indicate that it has less elastic anisotropy and lower shear modulus than most transition metal disilicides. The impacts of these physical properties on alloy processing and mechanical behavior are discussed. Room temperature Vickers indentation tests on the (100) and (001) planes have been performed for different orientations of the indenter diagonal and the corresponding hardness, fracture toughness, and deformation behavior have been obtained as a function of the crystallography. Finally, the physical properties and mechanical behavior of Mo5Si3 are compared with those of other high temperature structural silicides, e.g. MoSi2.

Original languageEnglish (US)
Pages (from-to)611-620
Number of pages10
JournalIntermetallics
Volume7
Issue number5
DOIs
StatePublished - May 1999
Externally publishedYes

Fingerprint

Physical properties
Single crystals
Elastic moduli
Silicides
Crystal growth from melt
Crystallography
Processing
Indentation
X ray powder diffraction
Temperature
Intermetallics
Transition metals
Thermal expansion
Fracture toughness
Anisotropy
Ultrasonics
Hardness
Spectroscopy
Hot Temperature
Direction compound

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Synthesis and properties of Mo5Si3 single crystals. / Chu, F.; Thoma, D. J.; McClellan, K.; Peralta, Pedro; He, Y.

In: Intermetallics, Vol. 7, No. 5, 05.1999, p. 611-620.

Research output: Contribution to journalArticle

Chu, F. ; Thoma, D. J. ; McClellan, K. ; Peralta, Pedro ; He, Y. / Synthesis and properties of Mo5Si3 single crystals. In: Intermetallics. 1999 ; Vol. 7, No. 5. pp. 611-620.
@article{3be98b60a5624b9cb7086a6743720098,
title = "Synthesis and properties of Mo5Si3 single crystals",
abstract = "The ultra-high temperature structural intermetallic Mo5Si3 has been studied for alloy processing, physical properties, and mechanical behavior. High purity single crystals of Mo5Si3 have been synthesized by both optical floating zone and Czochralski methods. Structural, thermal, and elastic properties of Mo5Si3 single crystals were measured by X-ray powder diffraction, thermal mechanical analysis, and resonant ultrasound spectroscopy, respectively. Results show that the thermal expansion of Mo5Si3, a tetragonal structure with I4/mcm symmetry, is strongly anisotropic along the a and c directions with αc/αa = 2.2. Single crystal elastic moduli of Mo5Si3 indicate that it has less elastic anisotropy and lower shear modulus than most transition metal disilicides. The impacts of these physical properties on alloy processing and mechanical behavior are discussed. Room temperature Vickers indentation tests on the (100) and (001) planes have been performed for different orientations of the indenter diagonal and the corresponding hardness, fracture toughness, and deformation behavior have been obtained as a function of the crystallography. Finally, the physical properties and mechanical behavior of Mo5Si3 are compared with those of other high temperature structural silicides, e.g. MoSi2.",
author = "F. Chu and Thoma, {D. J.} and K. McClellan and Pedro Peralta and Y. He",
year = "1999",
month = "5",
doi = "10.1016/S0966-9795(98)00059-4",
language = "English (US)",
volume = "7",
pages = "611--620",
journal = "Intermetallics",
issn = "0966-9795",
publisher = "Elsevier Limited",
number = "5",

}

TY - JOUR

T1 - Synthesis and properties of Mo5Si3 single crystals

AU - Chu, F.

AU - Thoma, D. J.

AU - McClellan, K.

AU - Peralta, Pedro

AU - He, Y.

PY - 1999/5

Y1 - 1999/5

N2 - The ultra-high temperature structural intermetallic Mo5Si3 has been studied for alloy processing, physical properties, and mechanical behavior. High purity single crystals of Mo5Si3 have been synthesized by both optical floating zone and Czochralski methods. Structural, thermal, and elastic properties of Mo5Si3 single crystals were measured by X-ray powder diffraction, thermal mechanical analysis, and resonant ultrasound spectroscopy, respectively. Results show that the thermal expansion of Mo5Si3, a tetragonal structure with I4/mcm symmetry, is strongly anisotropic along the a and c directions with αc/αa = 2.2. Single crystal elastic moduli of Mo5Si3 indicate that it has less elastic anisotropy and lower shear modulus than most transition metal disilicides. The impacts of these physical properties on alloy processing and mechanical behavior are discussed. Room temperature Vickers indentation tests on the (100) and (001) planes have been performed for different orientations of the indenter diagonal and the corresponding hardness, fracture toughness, and deformation behavior have been obtained as a function of the crystallography. Finally, the physical properties and mechanical behavior of Mo5Si3 are compared with those of other high temperature structural silicides, e.g. MoSi2.

AB - The ultra-high temperature structural intermetallic Mo5Si3 has been studied for alloy processing, physical properties, and mechanical behavior. High purity single crystals of Mo5Si3 have been synthesized by both optical floating zone and Czochralski methods. Structural, thermal, and elastic properties of Mo5Si3 single crystals were measured by X-ray powder diffraction, thermal mechanical analysis, and resonant ultrasound spectroscopy, respectively. Results show that the thermal expansion of Mo5Si3, a tetragonal structure with I4/mcm symmetry, is strongly anisotropic along the a and c directions with αc/αa = 2.2. Single crystal elastic moduli of Mo5Si3 indicate that it has less elastic anisotropy and lower shear modulus than most transition metal disilicides. The impacts of these physical properties on alloy processing and mechanical behavior are discussed. Room temperature Vickers indentation tests on the (100) and (001) planes have been performed for different orientations of the indenter diagonal and the corresponding hardness, fracture toughness, and deformation behavior have been obtained as a function of the crystallography. Finally, the physical properties and mechanical behavior of Mo5Si3 are compared with those of other high temperature structural silicides, e.g. MoSi2.

UR - http://www.scopus.com/inward/record.url?scp=0032648312&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032648312&partnerID=8YFLogxK

U2 - 10.1016/S0966-9795(98)00059-4

DO - 10.1016/S0966-9795(98)00059-4

M3 - Article

VL - 7

SP - 611

EP - 620

JO - Intermetallics

JF - Intermetallics

SN - 0966-9795

IS - 5

ER -