Sample preparation preparation, heat treatment and phase identi. The cooled samples were characterized using xray diffraction, scanning electron microscopy and energy. Similar is the case for ti aluminides, where heat of reaction is utilized for intermetallic phase formation 58. Phase evolution in the mixture was followed by heating the compacted samples up to 1273 k at 7. It finds use in several applications including aircraft, jet engines, sporting equipment and automobiles citation needed. Ni based alloys, ti based alloys, refractory metals. An overview of intermetallics research and application. However, in both cases al atoms act as an electron donor. The mechanism of iron and aluminum intermetallics formation in the reactive sintering of iron and aluminum mixing powders has been studied by investigating ironaluminum diffusion couples. The development of these materials, which have the advantages of low density and high operating temperatures, have been focused on the aluminides of titanium, nickel and iron.
Session functional intermetallics and miscellaneous session ti aluminides 1 session ni aluminides and superalloys session fe aluminides 1 get together with opening and opening talk coffee break 19. Intermetallics, ti nb aluminides, phase diagram, rapid solidification, ternary alloys, solid state quenching, 9. Mohammad zamanzade 1, afrooz barnoush 2 and christian. Proceedings of the 12 th conference of the european ceramic society ecers xii stockholm, sweden 2011 14 processing of intermetallics with al 2o3 or steel joints obtained by friction welding technique k. The development of these materials, which have the advantages of low density and high operating temperatures, have been focused on the aluminides. Phase diagram study on the tialmo quaternary systems. Number calculations as a tool for phase stability prediction in ni. With their high melting point and excellent high temperature oxidation resistance, silicides as a class of intermetallics, have potential for developing temperature capability beyond nickel base superalloys.
In the present work, we have investigated the structural and electronic properties of tmal tm fe, co, and ni transition metal aluminides in the b2 structure, using firstprinciple calculations of the density functional theory dft based on the linearized augmented plane wave method fplapw as implemented in the wien2k code, in which the energy of exchange and correlation are. A presentation notebook with a pdf reader and ms office powerpoint 20102007. Reactive synthesis and characterization of titanium. The ornl intermetallics program is a longterm, collaborative, research and development program involving various doe program offices. Powder mixture without mechanical alloying was prepared in a turbula mixer for a period of 8 h.
Extensive development efforts over the past 10 years have led to the. The mechanism and kinetics of the reactions, which led to ni ti phases, were determined by thermal analysis, insitu xrd and the application of an experimental model consisting of nickelplated titanium. New structural materials have to be stronger, stiffer and lighter to withstand the extremely demanding conditions in the next generation of aero and automotive. Iron and nickel aluminides were researched extensively in the 1980s and 90s in an attempt to take advantage of their attractive high temperature corrosion resistance3,4. Behavior of ti rich ni 3 ti,nb single crystals with various longperiod ordered structures 91 koji hagihara, tetsunori tanaka, takayoshi nakano, and yukichi umakoshi effect of fe alloying on the vacancy formation in ni 3al 97 e. Nickel aluminide ni 3 al is an intermetallic alloy of nickel and aluminium with properties similar to both a ceramic and a metal there are three materials called nickel aluminide. Chor egiewicz 1 1department of metalceramic composites. I otic file copy develomnent of metastable processing paths qfor hiah temperature alloys. The effect of current intensity on the ignition time, microstructure, homogeneity, and properties of the. For ti ni shape memory alloys, a refined and uniform intermetallic precipitate structure is favored by short annealing times. What are intermetallics and how can we overcome the. The calculated heats of formation for aluminides with equiatomic composition are plotted in figure18. The mechanism and kinetics of the reactions, which led to ni ti phases, were determined by thermal analysis, insitu xrd and the application of an experimental model.
Applications of ni3al based intermetallic alloyscurrent. A firstprinciples study of phase stability in ni ai and ni ti alloys. Results of xray diffraction analysis of the material during processing and following annealing are reported. Your presentation should be prepared as pdf or powerpoint office 2016. Integrative and interdisciplinary aspects of intermetallics. Please check the relevant section in this guide for authors for more details.
A firstprinciples study of phase stability in niai and ni ti alloys. What are intermetallics and how can we overcome the failures associated with them. Intermetallics intermetallic and advanced metallic materials a. Influence of highstrain rate and temperature on the. Molybdenum disilicide mosi2 this material is used for making heating elements for high temperature furnaces. The ni3alti, ni2alti, nial2ti and ni,al, ti reaction phases were observed at the interface between the al ni multilayer foils and the tial substrate.
Intermetallic compound an overview sciencedirect topics. The idea of a thesis focused on intermetallics arose after. The reactions are determined to be diffusion controlled similar to as shown in fig. Reaction synthesis of bulk intermetallic materials in ti ni system form kinetic spraying deposits. The dependence of tensile ductility on investment casting parameters in gamma titanium aluminides volume 552 r. The research mainly focuses on a 3 b and ab typed compounds of ti al, ni al, feal, which possess lower densities, high melting points and considerable mechanical. High temperature aluminides and intermetallics 1st edition elsevier. If the ratio of ti tonb was either too high or too low, the oxidation resistance was reduced dramatically. The corrosion behavior of arcmelted binary titanium aluminide intermetallics tial, ti 3 al, and tial 3 in aqueous sodium sulfate na 2 so 4 and sodium chloride nacl solutions was measured and compared to that of pure ti and al.
Mosi2 and other silicides as high temperature structural. Several potentially useful compounds exist in this family of materials. Schaefer titanium aluminides an electron microscope study of mechanical. For a copper metallization, the tin reacts to form cu 3 sn and cu 6 sn 5 intermetallics. The results showed that the al content and the ratio of ti tonb of the alloys affected the oxidation behavior in this ternary system. Synthesis of feal ti based intermetallics with the use of. Reaction synthesis of bulk intermetallic materials in ti. Citescore measures the average citations received per document published in this title. Physical metallurgy of nickel aluminides citeseerx.
Purchase high temperature aluminides and intermetallics 1st edition. Ordered intermetallics based on transition metal aluminides have been proposed as structural materials for advanced aerospace applications. Reactive currentactivated tipbased sintering of nial intermetallics. Lightweight intermetallic titanium aluminides status of. Intermetallic compounds form between pad metallization and the active components of the molten solder typically tin.
Nickel aluminide is used as a strengthening constituent in hightemperature nickelbase. It was found that an alrich intermetallics feal3 has formed in iron adjacent to the interface of iron and aluminum by. Read the latest articles of intermetallics at, elseviers. The formation of titanium aluminides in ti al elemental powder mixtures containing 25, 50 and 75 at. A firstprinciples study of phase stability in niai and niti alloys. Titanium aluminides an overview mrs online proceedings. Synthesis of fealti based intermetallics with the use of. Because of their intermediate position, the properties of intermetallics can be. A presentation notebook with a pdf reader and ms office powerpoint 2010 2007.
An oxidationresistant coating alloy for gamma titanium. Nial, cas number 12003780 see also raney nickel nial 3, cas number 12004716. Corrosion behavior of binary titanium aluminide intermetallics. Formation of intermetallic compound in ironaluminum. The program was initiated with ornl seed funds and was subsequently funded by basic energy sciences bes, which sponsors fundamental research, and by two program offices, fossil energy fe and energy efficiency ee. Reactive currentactivated tipbased sintering of nial. Precipitation hardening of cantor alloy containing titanium. Synthesis of ti3al, tial and al3ti intermetallic compounds in the ti al system have been attempted by mechanical alloying of tih1924 and al powders, followed by annealing.
High temperature aluminides and intermetallics 1st edition proceedings of the second international asm conference on high temperature aluminides and intermetallics, september 1619, 1991, san diego, ca, usa. Examples for such areas are the aerospace and automotive industries. Abstract continue on reverse f necessary and kdnify by block number. Properties of aa6061 aluminum alloy reinforced with. The titanium aluminides, ti 3 al and tial, are the materials with which we have been working the longest and on which development has proceeded the furthest. Aluminides, and iron aluminides have been the subject of the most activities in research and development over the last two decades. Citescore values are based on citation counts in a given year e. A bulk of the investigations in intermetallics has been done on the aluminides in the tial and the nial systems field et al 1991a. Oxidation of intermetallic alloys in tialnb ternary. The majority of the strength characterization studies on ordered intermetallics have concentrated on the assessment of strength and workhardening at conventional strain rates. Especially ti, ni and fe aluminides are treated in detail by experts from europe, usa and japan. Although the influence of strain rate on the structureproperty relationships of pure nickel, iron, and titanium and a variety of their alloys have been extensively studied, the effect of strain rate on the stress. In this work the formation of intermetallics in the ni ti system by reactive sintering at 800900 degrees c was studied.
Pdf a description of the important physical metallurgy aspects of nal and nial. It is lightweight and resistant to oxidation and heat, however it suffers from low ductility. A bulk of the investigations in intermetallics has been done on the aluminides. The information provided will be of wealth for any engineer and scientist materials scientist, physicist or chemist involved in the development of new intermetallic materials and their applications. High temperature aluminides and intermetallics 1st edition. Lamellar orientation control in directionally solidified. Metallic materials intermetallics properties and applications.
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