Journal ArticleDOI
The balance of mechanical and environmental properties of a multielement niobium-niobium silicide-based in situ composite
TLDR
In this paper, a Niobium-niobium silicide based in situ composite directionally solidified from a Nb-Ti-Hf-Cr-Al-Si alloy is described.Abstract:
This article describes room-temperature and high-temperature mechanical properties, as well as oxidation behavior, of a niobium-niobium silicide basedin situ composite directionally solidified from a Nb-Ti-Hf-Cr-Al-Si alloy. Room-temperature fracture toughness, high-temperature tensile strength (up to 1200 °C), and tensile creep rupture (1100 °C) data are described. The composite shows an excellent balance of high- and low-temperature mechanical properties with promising environmental resistance at temperatures above 1000 °C. The composite microstructures and phase chemistries are also described. Samples were prepared using directional solidification in order to generate an aligned composite of a Nb-based solid solution with Nb3Si- and Nb5Si3-type silicides. The high-temperature mechanical properties and oxidation behavior are also compared with the most recent Ni-based superalloys. This composite represents an excellent basis for the development of advanced Nb-based intermetallic matrix composites that offer improved properties over Ni-based superalloys at temperatures in excess of 1000 °C.read more
Citations
More filters
Journal ArticleDOI
A review of very-high-temperature Nb-silicide-based composites
TL;DR: In this paper, the most recent progress in the development of Nb-silicide-based in-situ composites for very high-temperature applications is reviewed, with emphasis on rupture resistance and oxidation performance.
Journal ArticleDOI
Ultrahigh-temperature Nb-silicide-based composites
Bernard Patrick Bewlay,Melvin Robert Jackson,Ji-Cheng Zhao,P. R. Subramanian,M. G. Mendiratta,John J. Lewandowski +5 more
TL;DR: In this article, the most recent progress in the development of Nb-silicide-based in situ composites for potential applications in turbine engines with service temperatures of up to 1350°C is reviewed.
Journal ArticleDOI
Mechanical behaviour and oxidation resistance of structural silicides
TL;DR: The high temperature deformation behavior of the structural silicides is complex, and depends on the composition and alloy content, crystal structure, character of bonding and orientation, microstructural constitution (nature of phases present) as discussed by the authors.
Journal ArticleDOI
Advanced intermetallic alloys—beyond gamma titanium aluminides
TL;DR: In this article, the authors present an overview of recent results on selected Nb-base intermetallers with particular emphasis on phase equilibria and mechanical behavior, including damage tolerance, creep resistance and oxidation tolerance.
Journal ArticleDOI
Study of the role of Al and Cr additions in the microstructure of Nb–Ti–Si in situ composites
TL;DR: In this paper, the effects of Cr (5 or 8 ǫ at.%) and Ta (6 or 8 ) in the microstructures of as-cast and heat-treated Nb-24Ti-18Si-5Al in situ composites have been studied.
References
More filters
High-temperature ordered intermetallic alloys
TL;DR: In this article, the authors describe the behavior of grain boundaries in a two-dimensional model ordered alloy and the effects of elastic anisotropy on the anomalious yield behavior of cubic ordered alloys.
Journal ArticleDOI
Strength and ductile-phase toughening in the two-phase Nb/Nb 5 Si 3 alloys
TL;DR: In this paper, the effect of heat treatment on the mechanical properties of Nb-Nb5-Si3 two-phase alloys having compositions Nb 10 and 16 pct Si (compositions quoted in atomic percent) was investigated.
Journal ArticleDOI
Strength and toughness of a Nb/Nb 5 Si 3 composite
TL;DR: In this article, the strength and toughness of a wrought Nb-1.65 at. pct Si alloy with near-eutectic composition, at temperatures from 25 C to 1500 C, was determined.
Journal ArticleDOI
Microstructures and Mechanical Behavior of Nb-Ti Base Beta + Silicide Alloys
TL;DR: In this paper, the effect of Ti and Al alloying additions to Nb-Si base alloys on phase equilibria, microstructures, temperature dependence of strength, low-temperature toughness, and environmental resistance was investigated.
Journal ArticleDOI
Compressive creep behavior of Nb5Si3
TL;DR: In this article, the compressive creep data for Nb5Si3 can be described by the following relation: e = 2.773 × 10 −22 kT exp ( −28125 T σ 0.8± 0.1 in the temperature range of 1200 to 1400 °C and stress regime of 52 to ~174 MPa.