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Article
Open AccessOutlook and challenges for hydrogen storage in nanoporous materials
Considerable progress has been made recently in the use of nanoporous materials for hydrogen storage. In this article, the current status of the field and future challenges are discussed, ranging from importan...
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Article
High Tempeature Ordered Compounds for Advanced AERO-Propulsion Applications
Advanced aero-propulsion engine designs now being considered for implementation require structural materials with high temperature strength and creep properties above 1300°C, in excess of the range where nicke...
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Article
Fracture toughness and fatigue crack growth in rapidly quenched Nb-Cr-Ti In situ composites
In situ composites based on the Nb-Cr-Ti ternary system were processed by rapid solidification in order to reduce the size of the reinforcing intermetallic phase. Two-phase microstructures with s...
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Article
The effects on fracture toughness of ductile-phase composition and morphology in Nb-Cr-Ti and Nb-Siin situ composites
Niobium-chromium alloys, both single and two phase, were alloyed with titanium in order to enhance fracture toughness and fatigue crack growth resistance. The selection of titanium as an alloying element and t...
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Article
Recombinant Hansenula polymorpha as a biocatalyst: coexpression of the spinach glycolate oxidase (GO) and the S. cerevisiae catalase T (CTT1) gene
The methylotrophic yeast Hansenula polymorpha has been developed as an efficient production system for heterologous proteins. The system offers the possibility to cointegrate heterologous genes in anticipated fi...
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Article
Ternary MoSi2 Compounds for High Temperature Structural Applications
The microstructure and phase composition of MoSi2 modified with Al, B, Ge, Hf, Nb, and Re have been investigated. B and Hf substitutions for Si and Mo, respectively, exhibited very low solubilities in MoSi2. Al a...
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Article
Fatigue and Fracture of Nb3Al/Nb In Situ Composites Based on an Nb 18 at.% Al Alloy
Near Nb3Al alloys, having Nb3Al with the ordered A15 crystalographic structure within regions of Nb solid solution, can be considered as in-situ reinforced composites. Nb-18 at.%Al ingots were arc melted and heat...
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Article
Microstructural and Mechanical Evaluation of Near γ-TiAl Alloys Containing Molybdenum and Rhenium
Near γ-TiAl alloys which incorporated Cr, and Mo or Re additions [Ti-48Al-2Cr-1.5Mo-0.1Y, Ti-48Al-2Cr-1.5Re-0.1Y, and Ti-46Al-2Cr-1.5Re-0.1Y(at.%)], were prepared by arc casting and hot isostatic pressing; the...
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Article
Phase Stability of MoSi2 with Cr Additions
The phase stability of MoSi2 with Cr additions has been investigated in order to explore the issues of ternary solubility and structural stability of MoSi2. The solidification microstructure of MoSi2-rich alloys,...
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Article
Mechanical evaluation of FP alumina reinforced NiAl Composites
NiAl is well known for its low density, superb oxidation resistance and low ductile to brittle transition temperature. It is equally renowned for its low room temperature fracture strength and poor high temper...
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Article
Intermetallic compounds: Structure and properties
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Article
Ternary Alloying of Refractory Intermetallics
One of the most attractive attributes of intermetallics is their potential for alloying to achieve the desired balance of engineering properties via the creative use of in-situ composite processing. Following ...
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Article
Chemical Compatibility of High Temperature Intermetallic Compounds with Various Potential Reinforcements
The chemical compatibility between five high temperature intermetallic compounds and six potential reinforcements are investigated. Diffusion couples are prepared by vacuum hot pressing. The most promising rei...
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Article
High-Temperature Deformation of Nb-18 Al
Specimens of Nb-18 at. % Al were bend-tested at 20° C, 1200° C, and 1600° C, and the deformed microstructures were characterized using TEM to determine phase distributions and slip systems. Material deformed a...
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Article
Feasibility Study of Intermetallic Composites
The feasibility of develo** high-temperature intermetallic composites for use as gas turbine engine components is assessed for a wide range of high temperature intermetallic matrices including aluminides, si...
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Article
Ductile Phase Toughening of Brittle Intermetallics
One method of imparting damage tolerance into intermetallic compounds is to introduce ductile particles in a fine uniform distribution. Systematic criteria are given as to the necessary requirements for such d...
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Article
High Temperature Properties of Refractory Intermetallics
On the basis of creep strength, ultimate tensile strength and oxidation resistance, seven intermetallic compounds with melting temperatures above 1600°C have been selected as possible candidate materials for h...
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Article
Selecting high-temperature structural intermetallic compounds: The engineering approach
While there are nearly 300 high-melting-temperature intermetallic compounds, numerous factors limit the commercial viability of these materials for structural applications. Once the desirability of a material’...
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Article
High Temperature Intermetallic Composites
Many intermetallic compounds possess properties which make them excellent candidates for high temperature use in advanced gas turbine and aerospace applications. One method proposed for increasing damage toler...
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Article
Creep Deformation of Ta Modified Gamma Prime Single Crystals
The role of substitutional element alloying of single phase γ’ has become of primary interest to alloy designers who would like to exploit its low density and excellent oxidation resistance. Current γ’ alloys ...
