In-situ refractory intermetallic-based composites

Shah, D. M.; Anton, Donald L.; Pope, D. P.; Chin, Stephen

doi:10.1016/0921-5093(95)03318-1

Cited by 74 publications

(35 citation statements)

References 12 publications

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“…6) Previous studies have demonstrated that the A2/D8 l twophase alloys in the Nb-Si binary system exhibit moderate toughness at ambient temperature and reasonable strength at elevated temperature. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] However the binary A2/D8 l twophase alloys with Nb-rich composition show insufficient oxidation resistance for practical use, 27) and therefore, the studies gradually evolve into multi-component systems by which balance is pursued between mechanical properties and environmental resistance. Much effort has been made to clarify the effect of alloying elements with the Nb-Si binary alloy system upon the mechanical properties and oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

Solidification Process and Mechanical Behavior of the Nb/Nb5Si3 Two Phase Alloys in the Nb-Ti-Si System

et al. 2004

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Design of two-phase alloys consisting of niobium solid solution (A2) and -Nb 5 Si 3 (D8 l ) phases in the Nb-Ti-Si ternary system is pursued for ultra-high temperature structural applications. Compositional and annealing conditions are determined for the formation of A2/D8 l lamellar microstructure via eutectoid decomposition of Nb 3 Si (tP32) phase in the Nb-Si binary and Nb-Ti-Si ternary system. Addition of titanium is found to result in increased room temperature toughness, but decreased high temperature strength. Enhancement of mechanical properties is achieved by applying the directional solidification technique. Mechanical properties of the alloys are discussed from microstructural point of view.

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Section: Introductionmentioning

confidence: 99%

Solidification Process and Mechanical Behavior of the Nb/Nb5Si3 Two Phase Alloys in the Nb-Ti-Si System

et al. 2004

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“…Intermetallic compounds have been paid much attention recently, due to their excellent properties in some aspects [1][2][3]. As one type of high-temperature intermetallic compound, niobium silicide possesses many superiorities, such as excellent high-temperature creep strength and high melting point (about 2793 K) [4,5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of a Directionally Solidified Nb-Ti-Si-Cr-Al-Hf-Dy Alloy

Sheng

2016

MATEC Web Conf.

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Abstract. The Nb-Ti-Si-Cr-Al-Hf-Dy alloy was prepared by conventionally casting and then directionally solidified (DS) with the optical floating zone melting technology. Microstructural evolution and mechanical properties of the as cast (AC) and DS alloys were studied by XRD, SEM, TEM, compression and bending tests. The results exhibit that Į-(Nb,Ti) 5 Si 3 , (Ti,Nb) 5 Si 3 and (Nb,Ti)ss phases formed the microstructure of the AC alloy, with precipitates of Cr 2 Nb, Dy 2 O 3 and (Nb,Ti) 3 Si along phase or grain boundaries. The DS alignes (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 lamellae parallel to the growth direction and refines the eutectic cell, but coarsens the primary Į-(Nb,Ti) 5 Si 3 phase. The DS alloy exhibits strong orientation of (310) (Nb,Ti)5Si3 and (110) (Nb,Ti)ss along the growth direction. TEM observation reveals that (Nb,Ti)ss and Į-(Nb,Ti) 5 Si 3 phases have an orientation relationship of [110] (Nb,Ti)ss // [310] Į-(Nb,Ti)5Si3 and (002) (Nb,Ti)ss // (002) Į-(Nb,Ti)5Si3 . Compared with the AC alloy, the DS increases the mechanical properties of the alloy obviously and the alloy DS at 8 mm/h exhibits the best mechanical properties.

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“…The aluminides Nb 3 Al and Nb 2 Al have been reported as interesting candidates due to both high-temperature strength and the potential to form a protective alumina scale, but respective alloys with further additions of Ti, V, Cr, or Hf were found to suffer from microstructural instability or internal oxidation with precipitation of alumina. [3,5] The present work focuses on an investigation of the combined alloying effect of Al and Fe. It appears that the simultaneous addition of Fe and Al increases the solubility limit in the Nb solid solution as well as expands the Nb 2 Al phase field.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] The basic concept relies on obtaining a multiphase microstructure consisting of the Nb solid solution and a high-melting, strengthening intermetallic phase (or phases). The aluminides Nb 3 Al and Nb 2 Al have been reported as interesting candidates due to both high-temperature strength and the potential to form a protective alumina scale, but respective alloys with further additions of Ti, V, Cr, or Hf were found to suffer from microstructural instability or internal oxidation with precipitation of alumina.…”

Section: Introductionmentioning

confidence: 99%

Nb-Based Nb-Al-Fe Alloys: Solidification Behavior and High-Temperature Phase Equilibria

Stein

Philips²

2017

Metall Mater Trans A

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High-melting Nb-based alloys hold significant promise for the development of novel high-temperature materials for structural applications. In order to understand the effect of alloying elements Al and Fe, the Nb-rich part of the ternary Nb-Al-Fe system was investigated. A series of Nb-rich ternary alloys were synthesized from high-purity Nb, Al, and Fe metals by arc melting. Solidification paths were identified and the liquidus surface of the Nb corner of the ternary system was established by analysis of the as-melted microstructures and thermal analysis. Complementary analysis of heat-treated samples yielded isothermal sections at 1723 K and 1873 K (1450°C and 1600°C).

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In-situ refractory intermetallic-based composites

Cited by 74 publications

References 12 publications

Solidification Process and Mechanical Behavior of the Nb/Nb<sub>5</sub>Si<sub>3</sub> Two Phase Alloys in the Nb-Ti-Si System

Solidification Process and Mechanical Behavior of the Nb/Nb<sub>5</sub>Si<sub>3</sub> Two Phase Alloys in the Nb-Ti-Si System

Microstructure Evolution and Mechanical Properties of a Directionally Solidified Nb-Ti-Si-Cr-Al-Hf-Dy Alloy

Nb-Based Nb-Al-Fe Alloys: Solidification Behavior and High-Temperature Phase Equilibria

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