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Microstructural behavior of Copper Alloys

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.

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Microstructural behavior of Copper Alloys

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

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

  3. 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

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

  5. Warning • Metal gets hot • Use appropriate protection • Well ventilated area

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

  7. Casting (back up plan)

  8. Alloy combinations

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

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

  11. Ag-Cu Phase diagram

  12. 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!!!

  13. Sn-Cu Phase diagram

  14. Zn-Cu Phase diagram

  15. 60 Cu-Sn 40 • Solubility limit has been reached • Unlike microstructures • Extremely brittle

  16. 60 Cu-Zn 40 • Not annealed • Extremely hard • Solubility limit has not been reached

  17. 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.

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