Microstructural behavior of Copper Alloys

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Presentation transcript:

Microstructural behavior of Copper Alloys Engr 45 Fall-05 By: Marco Ruiz Justin Matari Jeremy Romano

What we did… We casted several different combinations of copper alloys. Our objective is to observe how different microstructures can effect these alloys.

Like Dissolves Like To obtain a fully dissolved solid solution there needs to be some sort of compatible relationship between a solute and a solvent. Knowing the structural similarities between the two elements we are able to predict whether one will dissolve into the other. http://www.newton.dep.anl.gov/askasci/chem03/chem03348.htm

Question? What happens when you attempt to dissolve two different microstructures? This experiment will demonstrate the behaviors of common alloys: brass, bronze, copper-silver.

Warning Metal gets hot Use appropriate protection Well ventilated area

Casting Attempted to cast alloys into a pure calcium mold. Failed

Casting (back up plan)

Alloy combinations Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 %Cu 100 85 60 7.5 %Ag - 15 40 92.5 %Zn %Sn Hard Rh 43 Rh 66 Rh 71 Rb 44 * Rh 55

Zero to low alloy Copper 925 silver Rh 43 Rh 55 Even distribution of grains

High Alloy (fcc structure) 60 Cu-Ag 40 85 Cu-Ag 15 Rh 71 Rh 66 Both are completely soluble no matter what %.

Ag-Cu Phase diagram

Sn (fct), Zn (hcp) 85 Cu-Sn 15 85 Cu-Zn 15 Rb ? Rb 44 Grains act as barricades, non-uniform dist. What a difference!!!

Sn-Cu Phase diagram

Zn-Cu Phase diagram

60 Cu-Sn 40 Solubility limit has been reached Unlike microstructures Extremely brittle

60 Cu-Zn 40 Not annealed Extremely hard Solubility limit has not been reached

Discussion Like solvents, not all molten metals are fully miscible with each other. http://www.meta-synthesis.com/webbook/38_laing/tetrahedra.html Copper and zinc ions are about the same size, so except for the electric charge, they are pretty much the same so far as the crystal is concerned…… http://du.edu/~jcalvert/phys/zinc.htm Copper ions harden silver by the size of the atom. Smaller copper ions cause interstituals in the silver. But, they do not harden copper nearly as much as tin or zinc.