On the creep of directionally solidified MoSi2-Mo5Si3 eutectics

Mason, D. P.; Aken, David C. Van

doi:10.1016/0956-7151(94)00319-d

Cited by 61 publications

(29 citation statements)

References 20 publications

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“…Comparison of the volume fractions of different oxidation products indicates that the MoO 3 is the most abundant reaction product, which is consistent with the large mass loss observed after the transient mass gain during the TG studies on each of the investigated alloys (Figure 1). It is also obvious from Table III that Table III, it is obvious that the volume fraction of MoO 3 generated by Reaction [6] (the oxidation of Mo 3 (Si m Al n )) in the case of both the Al-containing alloys is slightly higher than that in Reaction [5] (the oxidation of Mo 3 Si) affecting the MSB alloy. Both the larger amount of MoO 3 formed and the presence of Al 2 O 3 with a greater density than that of SiO 2 are responsible for the higher transient mass gain as well as the greater mass loss recorded for the Al-containing alloys than for the MSB.…”

Section: Effect Of Volume Fraction Of Products and Competitive Oxidationmentioning

confidence: 90%

“…Such a large discrepancy is attributed to the formation of pores and cracks (Figures 4(b) and 8(a)) in the oxide scale, which relieve the volume strains. Furthermore, comparison of the data shown in Table III indicates that the volume expansions accompanying the oxidation of Mo 3 Si (Reactions [5], [9], and [10]) are greater than those due to the corresponding reactions affecting the Mo 3 Si m Al n phase (Reactions [6], [13], and [14]). Thus, it is inferred that the volume expansion strain is not responsible for the higher mass loss of the Al-containing alloys by cyclic oxidation.…”

Section: Residual Stressmentioning

confidence: 99%

“…[1][2][3][4][5] Some of the recent studies [6][7][8] have shown that boron-doped Mo 5 Si 3 and Mo 5 SiB 2 possess significantly higher creep resistance than MoSi 2 . However, the major hurdles that stand in the way of their widespread application are their inherent brittleness and poor room-temperature (RT) fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

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Nonisothermal and Cyclic Oxidation Behavior of Mo-Si-B and Mo-Si-B-Al Alloys

Paswan

Mitra

Roy

2009

Metall Mater Trans A

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A study on nonisothermal and cyclic oxidation behavior of the reaction-hot-pressed 76Mo-14Si-10B, 77Mo-12Si- alloys has been carried out in dry air, and the results have been compared with those of isothermal tests. Nonisothermal studies by thermogravimetric (TG) analysis up to 1300°C have shown a transient mass gain between 700°C and 860°C, followed by a sharp mass loss with increased temperature, with the amount of mass change dependent on the heating rate (5°C/min to 35°C/min). The X-ray diffraction (XRD) and scanning electron microscopy (SEM) studies of oxide scales formed on the alloys held at 790°C and 820°C for 10 or 20 minutes suggest that the oxidation of a-Mo and Mo 3 Si precedes that of Mo 5 SiB 2 . Thermal cyclic tests involving exposure at 1150°C for 1 hour, followed by either air cooling to room temperature (RT) or furnace cooling to 700°C, 800°C, or 900°C, and the subsequent examination of oxidation products, have confirmed that the formation of B 2 O 3 -SiO 2 scale provides complete and partial protection for the Mo-Si-B and Mo-Si-B-Al alloys, respectively. The results of this study show that oxidation resistance is deteriorated upon Al addition. Residual stress measured by XRD is found to be largely compressive in Mo and in mullite phases of oxide scales. Thermal shock and the mismatch in the coefficients of thermal expansion (CTEs) between the constituent phases of the oxide scale appear to be the main causes of damage.

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Section: Effect Of Volume Fraction Of Products and Competitive Oxidationmentioning

confidence: 90%

Section: Residual Stressmentioning

confidence: 99%

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Nonisothermal and Cyclic Oxidation Behavior of Mo-Si-B and Mo-Si-B-Al Alloys

Paswan

Mitra

Roy

2009

Metall Mater Trans A

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“…Single crystal studies on Mo 3 Si showed anomalous yield behavior and a lack of plastic deformation due to the fact that only three independent slip systems can occur [72]. MoSi 2 -Mo 5 Si 3 composites have superior creep behavior as compared to monolithic MoSi 2 [73]. Mo 3 Si-Mo 5 Si 3 composites showed excellent hardness, due to the presence of Mo 3 Si, but had a low toughness [74].…”

Section: Mechanical Behaviormentioning

confidence: 99%

Microstructures and oxidation behavior of some Molybdenum based alloys

Ray

2011

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“…[2][3][4][5][6] Moreover, creep resistance of directionally solidified MoSi 2 /Mo 5 Si 3 eutectics has been reported to be far better than that of single phase MoSi 2 . 7,8) Hence, it is expected that high temperature strength of NbSi 2 can be improved by incorporation with Nb 5 Si 3 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo Addition on Phase Stability and High-Temperature Strength of NbSi2/Nb5Si3 Composites

Yang

Shan

et al. 2004

Mater. Trans.

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Directionally solidified NbSi 2 /Nb 5 Si 3 in-situ composites have been prepared. Scanning Electron Microscopes (SEM) and X-ray diffraction (XRD) have been used to investigate phase constitution and microstructure. It was found that microstructure and phase stability of directionally solidified alloys depended on growth rate, heat-treatment and alloying element. Compression strength was tested in the temperature range from 1473 to 1773 K and compression axes parallel to growth direction was chosen. High-temperature strength of NbSi 2 /Nb 5 Si 3 composites increased from 222.9 to 593.77 MPa at 1773 K due to Mo addition.

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On the creep of directionally solidified MoSi2-Mo5Si3 eutectics

Cited by 61 publications

References 20 publications

Nonisothermal and Cyclic Oxidation Behavior of Mo-Si-B and Mo-Si-B-Al Alloys

Nonisothermal and Cyclic Oxidation Behavior of Mo-Si-B and Mo-Si-B-Al Alloys

Microstructures and oxidation behavior of some Molybdenum based alloys

Effect of Mo Addition on Phase Stability and High-Temperature Strength of NbSi<sub>2</sub>/Nb<sub>5</sub>Si<sub>3</sub> Composites

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