Elastic properties of C40 transition metal disilicides

Chu, F.; Lei, Ming; Maloy, Stuart A.; Petrovic, J. J.; Mitchell, T. E.

doi:10.1016/1359-6454(95)00442-4

Cited by 138 publications

(72 citation statements)

References 29 publications

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“…The modulus was estimated by the rule of mixtures for the 0.52 volume fraction of MoSi 2 and the 0.48 volume fraction of NbSi 2 using E(MoSi 2 ) = 204 GPa 28) and E(NbSi 2 ) = 362 GPa. 29) As in the case of hardness values, the toughness values were derived from the average of five measurements. The toughness value obtained by this method of calculation is 3 MPa·m 1/2 .…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Synthesis and Consolidation of Nanostructured MoSi2-NbSi2 Composite by High-Frequency Induction Heated Sintering and Its Mechanical Properties

Kang¹,

Shon²

2014

Korean. J. Mater. Res.

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The current concern about these materials (MoSi 2 and NbSi 2 ) focuses on their low fracture toughness below the ductile-brittle transition temperature. To improve the mechanical properties of these materials, the fabrication of nanostructured and composite materials has been found to be effective. Nanomaterials frequently possess high strength, high hardness, excellent ductility and toughness, and more attention is being paid to their potential application. In this study, nanopowders of Mo, Nb, and Si were fabricated by high-energy ball milling. A dense nanostructured MoSi 2 -NbSi 2 composite was simultaneously synthesized and sintered within two minutes by high-frequency induction heating method using mechanically activated powders of Mo, Nb, and Si. The high-density MoSi 2 -NbSi 2 composite was produced under simultaneous application of 80MPa pressure and an induced current. The sintering behavior, mechanical properties, and microstructure of the composite were investigated. The average hardness and fracture toughness values obtained were 1180 kg/mm 2 and 3 MPa·m 1/2 , respectively. These fracture toughness and hardness values of the nanostructured MoSi 2 -NbSi 2 composite are higher than those of monolithic MoSi 2 or NbSi 2 .

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Section: Resultsmentioning

confidence: 99%

Simultaneous Synthesis and Consolidation of Nanostructured MoSi2-NbSi2 Composite by High-Frequency Induction Heated Sintering and Its Mechanical Properties

Kang¹,

Shon²

2014

Korean. J. Mater. Res.

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“…Other silicides, such as TaSi 2 , WSi 2 , NbSi 2 , ZrSi 2 and VSi 2 have received relatively little attention. The melting point, crystal structure, density, formation enthalpy at 298K, and adiabatic temperature of TaSi 2 are 2025°C, hexagonal, 9.205 g/cm 3 , 32.4 kJ mol −1 , and 1,795 K [3][4][5]. As in the case of many intermetallic compounds, the current concern about these materials focuses on their low fracture toughness below the ductilebrittle transition temperature [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

One step synthesis and densification of nanocrystalline TaSi2–Si3N4 composite from mechanically activated powders by high-frequency induction-heated combustion

Park

Yoon

et al. 2008

J Electroceram

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Dense nanocrystalline 4TaSi 2 -Si 3 N 4 composite was synthesized by high-frequency induction-heated combustion synthesis (HFIHCS) method within 1 min in one step from mechanically activated powders of TaN and Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of an induced current and mechanical pressure. Highly dense 4TaSi 2 -Si 3 N 4 composite with relative density of up to 99% was produced under simultaneous application of a 60 MPa pressure and the induced current. The average grain size and mechanical properties (hardness and fracture toughness) of the composite were investigated.

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“…Regardless of the binary and ternary D8 m -structured Ta 5 Si 3 compounds, the values of C 66 is larger than C 44 , indicating that the [100](001) shear is easier than the [100](010) shear. The elastic anisotropy of the transition metal silicides has an important impact on the mechanical properties of the systems, especially on dislocation structures and mechanisms [35]. The anisotropy factors for tetragonal phases can be estimated as A = 2C 66 /(C 11´C12 ).…”

Section: Elastic and Mechanical Propertiesmentioning

confidence: 99%

The Effects of Al and Ti Additions on the Structural Stability, Mechanical and Electronic Properties of D8m-Structured Ta5Si3

Liu

Cheng

et al. 2016

Metals

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Abstract:In the present study, the influence of substitutional elements (Ti and Al) on the structural stability, mechanical properties, electronic properties and Debye temperature of Ta 5 Si 3 with a D8 m structure were investigated by first principle calculations. The Ta 5 Si 3 alloyed with Ti and Al shows negative values of formation enthalpies, indicating that these compounds are energetically stable. Based on the values of formation enthalpies, Ti exhibits a preferential occupying the Ta 4b site and Al has a strong site preference for the Si 8h site. From the values of the bulk modulus (B), shear modulus (G) and Young's modulus (E), we determined that both Ti and Al additions decrease both the shear deformation resistance and the elastic stiffness of D8 m structured Ta 5 Si 3 . Using the shear modulus/bulk modulus ratio (G/B), Poisson's ratio (υ) and Cauchy's pressure, the effect of Ti and Al additions on the ductility of D8 m -structured Ta 5 Si 3 are explored. The results show that Ti and Al additions reduce the hardness, resulting in solid solution softening, but improve the ductility of D8 m -structured Ta 5 Si 3 . The electronic calculations reveal that Ti and Al additions change hybridization between Ta-Si and Si-Si atoms for the binary D8 m -structured Ta 5 Si 3 . The new Ta-Al bond is weaker than the Ta-Si covalent bonds, reducing the covalent property of bonding in D8 m -structured Ta 5 Si 3 , while the new strong Ti 4b -Ti 4b anti-bonding enhances the metallic behavior of the binary D8 m -structured Ta 5 Si 3 . The change in the nature of bonding can well explain the improved ductility of D8 m -structured Ta 5 Si 3 doped by Ti and Al. Moreover, the Debye temperatures, Θ D , of D8 m -structured Ta 5 Si 3 alloying with Ti and Al are decreased as compared to the binary Ta 5 Si 3 .

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Elastic properties of C40 transition metal disilicides

Cited by 138 publications

References 29 publications

Simultaneous Synthesis and Consolidation of Nanostructured MoSi2-NbSi2 Composite by High-Frequency Induction Heated Sintering and Its Mechanical Properties

Simultaneous Synthesis and Consolidation of Nanostructured MoSi2-NbSi2 Composite by High-Frequency Induction Heated Sintering and Its Mechanical Properties

One step synthesis and densification of nanocrystalline TaSi2–Si3N4 composite from mechanically activated powders by high-frequency induction-heated combustion

The Effects of Al and Ti Additions on the Structural Stability, Mechanical and Electronic Properties of D8m-Structured Ta5Si3

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