Phase diagrams aluminum-copper

Copper-aluminum phase diagram. Reprinted with permission of ASM International from ASM Handbook, vol. 8, 8th ed. (Materials Park, OH ASM, 1973), p. 259. All rights reserved. www.asminternational.org. 

Examine the copper-aluminum phase diagram and predict whether cgb /c o is larger for copper segregating to grain boundaries in aluminum or aluminum segregating to grain boundaries in copper. 

Figure 9.37 is a portion of the copper-aluminum phase diagram for which only single-phase regions are labeled. Specify temperature-composition points at which all eutectics, eutectoids, peritectics, and congruent phase transformations occur. Also, for each, write the reaction upon cooling. 

Figpre 9.37 The copper-aluminum phase diagram. (From Metals Handbook, Vol. 8,8th edition. Metallography, Structures and Phase Diagrams, 1973. Reproduced by permission of ASM International, Materials Park, OH.)... 

Fig. 14. Aluminum-rich portion of alurninum—copper-phase diagram.

Phase diagrams for the systems silver/copper (limited solubility in the solid) and aluminum/silicon (formation of an eutectic mixture)... 

Alloys are prepared commercially and in the laboratory by melting the active metal and aluminum in a crucible and quenching the resultant melt which is then crushed and screened to the particle size range required for a particular application. The alloy composition is very important as different phases leach quite differently leading to markedly different porosities and crystallite sizes of the active metal. Mondolfo [14] provides an excellent compilation of the binary and ternary phase diagrams for aluminum alloys including those used for the preparation of skeletal metal catalysts. Alloys of a number of compositions are available commercially for activation in the laboratory or plant. They include alloys of aluminum with nickel, copper, cobalt, chromium-nickel, molybdenum-nickel, cobalt-nickel, and iron-nickel. 

FigMre 11.25 The aluminum-rich side of the aluminum-copper phase diagram. 

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