On the ductile-to-brittle transition temperature in MoSi2

Aikin, Robert M.

doi:10.1016/0956-716x(92)90224-3

Cited by 92 publications

(27 citation statements)

References 4 publications

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“…Limited microcracking was observed in samples tested at 1100 °C, which was not found in the samples tested at a higher temperature. It should be noted that tests conducted by Aikin [2] and Srinivasan et al [4] were in bending, while those of Chang et al [7] were in compression. Bend tests involve the application of both tensile and compressive loading, and failure initiates in the area experiencing maximum tensile stress.…”

Section: Introductionmentioning

confidence: 94%

“…But, there are other factors affecting the onset of plastic deformation. From the measurement of outer fiber strain in four-point bend specimens, [2] the BDTT in MoSi 2 has been reported as 1300 °C, irrespective of SiO 2 content. Some articles [3,4] have however, reported 1000 °C to 1200 °C as the BDTT in MoSi 2 .…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, applications have been proposed or are being attempted in hot-end components of aerospace gas turbines, diesel engine glow plugs, and molten-metal lances. [1] Having being projected as a material for high-temperature structural applications, the thrust of research on MoSi 2 has been on improving the high-temperature mechanical properties [2][3][4][5][6][7][8][9][10][11][12] and establishing a comprehensive understanding of deformation mechanisms. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Single-crystal MoSi 2 has been found to plastically deform even at room temperature [13] in relatively "soft" orientations away from [001], such as [110], [201], or [0 15 1], while polycrystalline MoSi 2 cannot deform without cracking until 1000 °C, as only four independent slip systems have been found to be active at or below 1000 °C.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature deformation behavior of coarse- and fine-grained MoSi2 with different silica contents

Mitra

Prasad

Kumari

et al. 2003

Metall Mater Trans A

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The elevated-temperature deformation behavior of polycrystalline molybdenum disilicide (MoSi 2 ), in the range of 1000 °C to 1350 °C at the strain rates of 10 Ϫ3 , 5 ϫ 10 Ϫ4 , or 10 Ϫ4 s Ϫ1 , has been studied. The yield strength, post-yield flow behavior comprising strain hardening and serrations, as well as some of the deformation microstructures of reaction-hot-pressed (RHP) MoSi 2 samples, processed by hot pressing an elemental Mo ϩ Si powder mixture and having a grain size of 5 mm and oxygen content of 0.06 wt pct, have been compared with those of samples prepared by hot pressing of commercial-grade Starck MoSi 2 powder, with a grain size of 27 mm and oxygen content of 0.89 wt pct. While the fine-grained RHP MoSi 2 samples have shown higher yield strength at relatively lower temperatures and higher strain rates, the coarse-grained Starck MoSi 2 has a higher yield at decreasing strain rates and higher temperatures. The work-hardening or softening characteristics are dependent on grain size, temperature, and strain rate. Enhanced dislocation activity and dynamic recovery, accomplished by arrangement of dislocations in low-angle boundaries, characterize the deformation behavior of fine-grained RHP MoSi 2 at a temperature of 1200 °C and above and are responsible for increased uniform plastic strain with increasing temperature. The silica content appears to be less effective in degrading the high-temperature yield strength if the grain size is coarse, but leads to plastic-flow localization and strain softening in Starck MoSi 2 . Serrated plastic flow has also been observed in a large number of samples, mostly when deformed at specific combinations of strain rates and temperatures.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-temperature deformation behavior of coarse- and fine-grained MoSi2 with different silica contents

Mitra

Prasad

Kumari

et al. 2003

Metall Mater Trans A

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“…[1]. In the present conditions, the where T S , T M , and T max are the starting temperature of the thermal energy described on the left-hand side of Eq.…”

Section: Introductionmentioning

confidence: 97%

“…[1,2] However, MoSi 2 also has some addition of titanium may improve the mechanical properties significant disadvantages such as brittleness at room temperof the MoSi 2 -base alloys, because it brings about a dualature and active oxidation at low temperatures around 800 phase structure of (␣ ϩ ␤) or (␤ ϩ ␥). The grain size in a K. [3] dual-phase structure is usually smaller than that in a monoThe ductility of MoSi 2 at room temperature can be phase structure.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of MoSi2-TiSi2 pseudobinary alloys by reactive sintering

Matsuura

Ohmi

Kudoh

et al. 2000

Metall Mater Trans A

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MoSi 2 -TiSi 2 pseudobinary alloys are synthesized from mixtures of elemental powders of molybdenum, silicon, and titanium by reactive sintering under a pseudoisostatic pressure of 150 MPa. When the titanium content in the alloy increases from 0 to 33 at. pct, the density of the alloy decreases from approximately 6 to 4 g/cm 3 , while the relative density is more than 95 pct independent of the titanium content. Vickers hardness of the alloy is approximately 800 when the alloy consists of a monophase structure of ␣-MoSi 2 or ␤-MoSi 2 . However, the hardness increases to approximately 950 when the alloy consists of a dual-phase structure of (␣-MoSi 2 ϩ ␤-MoSi 2 ) or (␤-MoSi 2 ϩ ␥-TiSi 2 ). The oxidation resistance of the alloy at 773 K is approximately tripled when the titanium content increases from 0 to 1.7 at. pct, but the effect of the titanium content on the oxidation resistance becomes less remarkable as the titanium content increases.

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High Temperature Structural Silicides

Petrovic

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering A

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On the ductile-to-brittle transition temperature in MoSi2

Cited by 92 publications

References 4 publications

High-temperature deformation behavior of coarse- and fine-grained MoSi2 with different silica contents

High-temperature deformation behavior of coarse- and fine-grained MoSi2 with different silica contents

Synthesis of MoSi2-TiSi2 pseudobinary alloys by reactive sintering

High Temperature Structural Silicides

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