The treatment is suitable for senior undergraduate and post-graduate students who are conducting research in solid-state physics or chemistry and are interested in intermetallic alloys
The intermetallic alloys with nominal composition [Ni.sub.75][Al.sub.25] and [Ni.sub.75][Al.sub.24][M.sub.1] (where M = Ag, Au, Pd, and Pt) were manufactured in quartz crucibles in an induction furnace under inert atmosphere using elements with purity higher than 99.99%.
In order to reveal the microstructure of the intermetallic alloys, they were etched by immersing in HF-HN[O.sub.3] solution (1 : 1 molar ratio) for 5 to 10 seconds at room temperature.
Figure 3 shows the microstructure of intermetallic alloys evaluated, and it is observed that there are notable changes in the microstructure of the doped alloys, which can be explained according to the preferential growth plane of each alloy (Figure 1) and an increase in the solidification rate.
Figure 4 shows the curves (solid lines) of weight gain per unit area as a function of exposure time during the process of oxidation of the intermetallic alloys between 900 and 1100[degrees]C.
Figure 9 shows the thickness of the oxide formed on the intermetallic alloys oxidized to 900[degrees]C; similar aspects were observed at higher temperatures.
Marcus, "Effect of platinum on the growth rate of the oxide scale formed on cast nickel aluminide intermetallic alloys," Oxidation of Metals, vol.
Mantle, The machining of [gamma]-TiAl intermetallic alloys
, CIRP Annals-Manufacturing Technology 54 (2005) 99-104.
Contributed by scientists from Europe, Asia, and the US, the 30 chapters explain the surface properties of alloys, the properties of surface alloys, surfaces of compound semiconductors, the physical properties of surface silicides, the properties of oxide surfaces, and surfaces of simple ionic crystals, ice, quasicrystals and related intermetallic alloys
, and amorphous/glassy materials.
The Machining of [gamma]-TiAl Intermetallic Alloys
, CIRP Annals -Manufacturing Technology, Vol.
Researchers at Los Alamos (NM) National Laboratory, for example, have developed a SiC-reinforced molybdenum disilicide intermetallic that, at temperatures greater than 1200 C, is 15 times stronger than current intermetallic alloys
. It also has 100 times better oxidation resistance and is 40 times more fracture resistant.
The Machining of y-TiAl Intermetallic Alloys
, CIRP Annals - Manufacturing Technology , Vol.