Metals Special Issue Advanced Refractory Alloys
Advanced refractory alloys in particular refractory intermetallic composites (RMICs) such as Nb-silicide in situ composites and Mo-silicide based alloys refractory high entropy alloys (RHEAs) refractory complex concentrated alloys (RCCAs) and refractory complex concentrated superalloys (RSA) attract much attention as perspective structural materials for use at temperatures much beyond Ni-based
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Niobium Silicide High Temperature In Situ Composites
New alloys based on refractory metal intermetallic compounds can offer a balance of mechanical and environmental properties.
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Nickel aluminide containing refractory-metal dispersoids
for times up to 50 h. Intermetallic synthesis takes place after lo-20 h alloying with concomitant dispersion of the inert refractory metal phase resulting in an NiAl matrix containing fine refractory dispersoids. The reactive synthesis step is direct without inter- mediate intermetallic products.
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Microstructures and Properties of Refractory Niobium
The microstructures mechanical properties and oxidation resistance of the refractory Nb-silicide-based composites have been investigated by scanning electron microscopy (SEM) X-ray diffraction (XRD) compression tests and high-temperature oxidation experiments. The results showed that 1773K/100h heat-treatment was an optimum processing for acquiring equilibrium Nb solid solution and
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(PDF) Refractory metal-intermetallic in-situ composites
In this article fracture toughness oxidation characteristics high-temperature mechanical behavior and low-temperature fatigue properties of refractory metal-intermetallic composites (RMICs) are
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Studies on synthesis and microstructure evolution of
Jul 27 2011 · This paper presents the results on in-situ synthesis of refractory metal-intermetallic composites (RMICs) Mo-16Cr-4Si and Mo-11Cr-9Si (wt. ) multiphase alloys and their characterization. The alloys were prepared from the oxides of molybdenum and chromium by their coreduction with Si as reductant. Exothermic nature of the synthesis reactions resulted in the formation of consolidated composite
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International Journal of Refractory Metals and Hard
CiteScore 2019 5.5 CiteScore measures the average citations received per peer-reviewed document published in this title. CiteScore values are based on citation counts in a range of four years (e.g. ) to peer-reviewed documents (articles reviews conference papers data papers and book chapters) published in the same four calendar years divided by the number of these documents in
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Intermetallic/Metallic Polyphase In-Situ Composites MRS
Feb 15 2011 · Abstract To evaluate various in-situ reinforcement schemes a computer controlled containerless directional solidification system has been used to produce NiAl-based polyphase composites containing up to two intermetallic phases and at least one ductile phase.
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Nickel aluminide containing refractory-metal dispersoids 2
discontinuous refractory-metal particulates in the NiAl matrix e.g. by rapid solidification of the melt lo or hot compaction of pre-alloyed NiAl and refractory- metal powders 111. While the strength of these dis- continuously reinforced composites is expected to be
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Microstructure and Tribological Properties of Mo–40Ni–13Si
alloy produced using in situ arc-melting route were binary intermetallic compound NiMo ternary Mo2Ni3Si metal silicide with a topologically closed packed (TCP) phase having the hP12 MgZn2 type Laves crystal lattice and refractory metal Mo phase. It is consistent with the expectation of alloy design.
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Refractory Metal (Nb) Intermetallic Composites High
Feb 01 2021 · Refractory metal intermetallic composites (RMICs) refractory (metal) high entropy alloys (RHEAs) and refractory (metal) complex concentrated alloys (RCCAs) proffer a paradigm for advanced metallic UHTMs to replace Ni-based superalloys 3 . RMICs include Nb-silicide-based alloys (RM (Nb)ICs) and Mo-silicide-based alloys (RM (Mo)ICs).
Get Price(PDF) Mullite-refractory metal (Mo Nb) composites
Available online at sciencedirect Journal of the European Ceramic Society 28 (2008) 479–491 Mullite-refractory metal (Mo Nb) composites J.S. Moya a M. D´ıaz a C.F. Guti´errez-Gonz´alez a L.A. Diaz b R. Torrecillas b J.F. Bartolom´e a ∗ a Instituto de Ciencia de Materiales de Madrid (ICMM) CSIC Cantoblanco 28049 Madrid Spain b Instituto Nacional del Carb´on
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Intermetallic/Metallic Polyphase In-Situ Composites
Request PDF Intermetallic/Metallic Polyphase In-Situ Composites To evaluate various in-situ reinforcement schemes a computer controlled containerless directional solidification system has
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Studies on Synthesis and Characterization of Mo Based In
The results of an in situ synthesis of refractory metal-intermetallic composite (RMIC) Mo-16Cr-4Si (wt pct) multiphase alloy and its characterization are presented in this study. The alloy was prepared from the oxides of molybdenum and chromium by their co-reduction with Si metal powder as a reductant. The exothermic nature of these reactions resulted in the formation of consolidated
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Mo–40Ni–13Si Multiphase Intermetallic Alloy
Regarding wear resistance intermetallic composites toughened by ductile metals could be better than non-toughened even though it may somewhat offset some deleterious effects associated with the decrease in hardness 26 . Another focus in this novel alloy design is on understanding that the in situ formation of metallic
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Microstructure and Tribological Properties of Mo–40Ni–13Si
alloy produced using in situ arc-melting route were binary intermetallic compound NiMo ternary Mo2Ni3Si metal silicide with a topologically closed packed (TCP) phase having the hP12 MgZn2 type Laves crystal lattice and refractory metal Mo phase. It is consistent with the expectation of alloy design.
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International Journal of Refractory Metals and Hard
CiteScore 2019 5.5 CiteScore measures the average citations received per peer-reviewed document published in this title. CiteScore values are based on citation counts in a range of four years (e.g. ) to peer-reviewed documents (articles reviews conference papers data papers and book chapters) published in the same four calendar years divided by the number of these documents in
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Mo–40Ni–13Si Multiphase Intermetallic Alloy
Regarding wear resistance intermetallic composites toughened by ductile metals could be better than non-toughened even though it may somewhat offset some deleterious effects associated with the decrease in hardness 26 . Another focus in this novel alloy design is on understanding that the in situ formation of metallic
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Murali Kartheek S SResearcherBITS Pilani Hyderabad
In this study four Al-Cu based Metal-intermetallic laminated (MIL) composites were processed via diffusion bonding wherein in-situ reactions between Al and Cu produce various intermetallic phases. Varying amounts of intermetallic phases were obtained in the four MILs by control of processing parameters and their respective hardness and Young
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High Temperature Siliddes and Refractory Alloys
IN-SITU COATING TECHNIQUES TO INTERMETALLIC MATRIX COMPOSITES 87 H. Doty M. Somerday and R. Abbaschian POWDER PROCESSING OF REFRACTORY METALS AND ALLOYS 341 Randall W. German •DIRECTIONAL SOLIDIFICATION OF REFRACTORY PROPERTIES OF Nb-10 a/o Si IN-SITU COMPOSITE 377 I. Weiss M. Thirukkonda and R. Srinivasan
Get PriceHigh Temperature Materials Based on the Intermetallic
High Temperature Materials Based on the Intermetallic Compound NiAl Reinforced by Refractory Metals for Advanced Energy Conversion Technologies. The intermetallic compound NiAl with B2 superlattice structure exhibits superior physical and high temperature mechanical properties and excellent oxidation resistance. These in‐situ
Get PricePreparation of Titanium Metal Matrix Composites Using
In this work the "4M-System" (Machine for Multi-Material-Manufacturing) has been developed by RHP Technology for the manufacturing of Titanium Metal Matrix Composites. This equipment allows the Additive Layer Manufacturing (ALM) of large structures and uses a Plasma Transferred Arc (PTA) as a heat source for depositing feedstocks (powder/wire) layer by layer onto a substrate.
Get PriceAluminum metal matrix composite materials reinforced by
A process for making composite materials namely reinforced Al-metal matrix composites based on either (I) Al-W intermetallic phase and Al 2 O 3 ceramic whiskers or (II) Al-Mo intermetallic phase and Al 2 O 3 ceramic whiskers. This process involves the oxidation of aluminum using tungsten oxide in powder form for product I and that of aluminum and molybdenum oxide in powder form for product II.
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Nickel aluminide containing refractory-metal dispersoids
for times up to 50 h. Intermetallic synthesis takes place after lo-20 h alloying with concomitant dispersion of the inert refractory metal phase resulting in an NiAl matrix containing fine refractory dispersoids. The reactive synthesis step is direct without inter- mediate intermetallic products.
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Novel Applications of Aluminium Metal Matrix Composites
Nov 22 2018 · Additionally the emergence of the intermetallic matrix and carbon matrix composites as reported by has broadened the scope of composites. Intermetallic compounds are metal-based systems centred on the fixed atomic compositions occurring in metallic systems of aluminium with nickel (Ni) titanium (Ti) and niobium (Nb) such as Ni 3 Al Ti 3 Al
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NiAl-based polyphase in situ composites in the NiAI-Ta-X
Polyphase in situ composites were generated by directional solidification of tern-ary eutectics. This work was performed to discover if a balance of properties could be produced by combining the NiA1 Laves phase and the NiAI refractory metal phase eutectics. The systems investigated were the Ni A1 Ta X (X = Cr Mo or V) alloys.
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Microstructures and Properties of Refractory Niobium
The microstructures mechanical properties and oxidation resistance of the refractory Nb-silicide-based composites have been investigated by scanning electron microscopy (SEM) X-ray diffraction (XRD) compression tests and high-temperature oxidation experiments. The results showed that 1773K/100h heat-treatment was an optimum processing for acquiring equilibrium Nb solid solution and
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Microstructures and Mechanical Properties of Composites
3.1 Friction wears of AlMg5/AlN and AlMg10/AlN composites obtainted "in situ" The Universal Micro-Tribometer can be used effectively for the tribological testing of ferrous and non-ferrous metals plastics ceramics paper composites thin and thick coatings as well as of
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IN-SITU COATING TECHNIQUES TO INTERMETALLIC MATRIX COMPOSITES 87 H. Doty M. Somerday and R. Abbaschian POWDER PROCESSING OF REFRACTORY METALS AND ALLOYS 341 Randall W. German •DIRECTIONAL SOLIDIFICATION OF REFRACTORY PROPERTIES OF Nb-10 a/o Si IN-SITU COMPOSITE 377 I. Weiss M. Thirukkonda and R. Srinivasan
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