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T4 designates a heat treatment (Al alloys only)

Behold, O Man, you can create life. You can destroy life. But, lo, you have no choice but to experience life. And therein lies both your greatest strength and your greatest weakness - Orange Catholic Bible. T4 designates a heat treatment (Al alloys only)

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T4 designates a heat treatment (Al alloys only)

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  1. Behold, O Man, you can create life. You can destroy life. But, lo, you have no choice but to experience life. And therein lies both your greatest strength and your greatest weakness -Orange Catholic Bible

  2. T4 designates a heat treatment (Al alloys only) "solution heat-treated, quenched, and naturally aged to a substantially stable condition" How do we know this works?…….& why does it make the material stronger?

  3. A portion of the Al-Cu "phase diagram" How do we know it works? We consult a road map for the material system

  4. We have a nomenclature problem

  5. A new concept - the solid solution

  6. A new concept - the solid solution

  7. A new concept - the solid solution

  8. A new concept - the solid solution

  9. A new concept - the solid solution

  10. A new concept - the solid solution

  11. A new concept - the solid solution

  12. A new concept - the solid solution

  13. A new concept - the solid solution A single phase Cu-Zn alloy is formed Then, where are the Zn atoms??

  14. Note "close-packing" rCu = 1.28 Å rZn = 1.37 Å Substitutional solid solutions like this are common in material systems

  15. This is a single phase solid solution Note: since Zn atom slightly larger, some distortion of structure.

  16. Soln ht treat Now, back to the road map Purpose: make single phase

  17. Age Quench Purpose: start formation of 2nd phase (pptn) Now, back to the road map Purpose: maintain single phase

  18. Yield strength Tensile strength Low-strength 30 ksi 60 ksi steel Pure aluminum 5 ksi 13 ksi Al alloy 2024-T4 47 ksi 68 ksi Changing structure changes properties!

  19. Assignments for next class: 1. review today's classnotes; know what a phase is, solid solution, close-packing, procedure for age hardening 2. check syllabus materials at: http://www.ems.psu.edu/~ryba/coursework/259/matse%20259.html

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