Intermetallics

Abstract

The article contains sections titled: 1. Introduction 1.1. Definition of Intermetallics 1.2. Historical Remarks 2. General Considerations 2.1. Crystal Structure and Compound Stability 2.2. Basic Properties 2.3. Criteria for Compound Selection 3. Magnetic Materials 3.1. AlNiCo Alloys 3.2. FeCo Alloys 3.3. Sendust Alloy 3.4. Laves Phases 3.5. Rare‐Earth Compounds 4. Superconducting Materials 4.1. Laves Phases 4.2. A15 Compounds 4.2.1. V 3 Si 4.2.2. V 3 Ga 4.2.3. Nb 3 Sn 4.2.4. Nb 3 Al 4.2.5. Nb 3 Si 5. Electronic Materials 5.1. Silicides 5.2. Other Compounds 6. Electric Materials 7. Thermoelectric and Thermomagnetic Materials 7.1. Silicides 7.2. Other Thermoelectric Compounds 7.3. Thermomagnetic Compounds 8. Optical Materials 9. Hydrogen‐Storage Materials 9.1. B2 Compounds 9.2. Laves Phases 9.3. Rare Earth Metal Compounds and Other Phases 10. Electrode Materials 10.1. Mg 2 Ni Alloys 10.2. Laves Phase Alloys 10.3. RNi 5 Alloys 11. Coating Materials 11.1. Aluminides 11.2. Silicides 12. Shape‐Memory Materials 12.1. Cu‐Base Alloys 12.1.1. Cu ‐ Zn ‐ Al Shape Memory Alloys 12.1.2. Cu ‐ Al ‐ Ni Shape‐Memory Alloys 12.2. NiAl Alloys 12.3. NiTi Alloys 13. Medical Biomaterials 14. Dental Materials 14.1. Amalgams 14.2. Cu ‐ Au Alloys 15. Wear‐Resistant Materials 16. Structural High‐Temperature Materials 16.1. Titanium Aluminide Alloys 16.1.1. Ti 3 Al Alloys 16.1.2. TiAl Alloys 16.2. Iron Aluminide Alloys 16.2.1. Fe 3 Al Alloys 16.2.2. FeAl Alloys 16.3. Nickel Aluminide Alloys 16.3.1. Ni 3 Al alloys 16.3.2. NiAl Alloys 16.4. Silicide Alloys

Electron Beam Melting of High Niobium Containing TiAl Alloy: Feasibility Investigation

“…Titanium aluminide alloys have been studied for more than 50 years 1, 2. Their outstanding properties together with their low density make them a serious candidate to replace the heavier Ni‐based alloys currently used as structural parts in the aeronautic field 1–9. In particular, low‐pressure turbine blades have been considered a promising application 1, 3, 4, 9.…”

“…However, without special control of chemical composition and microstructure γ‐TiAl may exhibit low ductility and toughness, especially at low and intermediate temperature: properties required for structural applications 4, 7, 11, 12. The chemical composition has a strong influence on material properties 1–3, 7–9, 11. Thus, the aluminum content shows to significantly affect the ductility of single and two‐phase TiAl alloys, the best being around 48 at% Al 2, 13, 14.…”

“…The chemical composition has a strong influence on material properties 1–3, 7–9, 11. Thus, the aluminum content shows to significantly affect the ductility of single and two‐phase TiAl alloys, the best being around 48 at% Al 2, 13, 14. A first generation alloys for engineering purpose with a composition Ti–48Al–1V–(0.1–0.3)C have been studied 2, 15.…”

“…Thus, the aluminum content shows to significantly affect the ductility of single and two‐phase TiAl alloys, the best being around 48 at% Al 2, 13, 14. A first generation alloys for engineering purpose with a composition Ti–48Al–1V–(0.1–0.3)C have been studied 2, 15. These alloys, developed on the base of ductility and creep resistance, exhibit poor properties with regards to the requirements of engine structural parts 15.…”

“…The microstructure is also a very important factor to consider when working with γ‐TiAl alloys and their mechanical properties 4, 5, 7, 13, 21–25. Basically, four different microstructures can be obtained: equiaxed, duplex, nearly lamellar, and fully lamellar 1, 2, 24. Depending on the microstructural form, specific sets of mechanical properties can be obtained 21, 22.…”