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MSE 201 LAB II: Part b

MSE 201 LAB II: Part b. Annealing Copper Alloys. Lab Overview. Each alloy (Pure, 5% Zn, 10% Zn, 20% Zn) will be annealed for 45 minutes at 8 temperatures: 200°C, 250°C, 300°C, 350°C, 400°C, 500°C, 600°C, and 800°C

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MSE 201 LAB II: Part b

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  1. MSE 201 LAB II: Part b Annealing Copper Alloys

  2. Lab Overview • Each alloy (Pure, 5% Zn, 10% Zn, 20% Zn) will be annealed for 45 minutes at 8 temperatures: 200°C, 250°C, 300°C, 350°C, 400°C, 500°C, 600°C, and 800°C • Hardness after each anneal will show amount of recrystallization or grain growth • PROCEED TO FURNACE ROOM TO CONDUCT ANNEALING

  3. What is Recrystallization? • Recovering damage and forming new grains by addition of heat (click to play)

  4. Stages During Annealing • I: Recovery • II: Recrystallization • III: Grain Growth

  5. Goal: Plot of Hardness vs. Annealing Temp I: Recovery II: Recrystallization III: Grain Growth

  6. Joined Plots Hardness vs. %CW and Annealing Temperature

  7. Etch Pits Annealing Twins Grain Boundaries Stress Free Grain http://www.copper.org/resources/properties/microstructure/brasses.html

  8. http://www.copper.org/resources/properties/microstructure/brasses.htmlhttp://www.copper.org/resources/properties/microstructure/brasses.html

  9. Slip Lines Deformation Bands Distorted Grains

  10. New Crystal Formation

  11. Microstructure Examination • 5% Zinc samples will be examined • Sample 242: Shows effects of % cold working • Sample 243: Shows effects of annealing temperature. • Look for: • Grain Boundaries • Stress Free Grains • Distorted Grains • New Crystals • Deformation Bands • Slip Lines • Annealing Twins • Etch Pits • Scratches

  12. After Removing Samples… • Remove oxide scale with sand paper • Average hardness results for each sample (HRF/HRB) and convert to DPH • Make sure data sheet is completely filled out • Place samples in recycle box. • Turn Data Sheet in to TA Remember: There is a report DUE NEXT WEEK!

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