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Nist project class report
- 1. Quantifying microstructural features in aging process of Al6061 Ali Khosravani Jordan Weaver
- 2. Project Goal: Extract Microstructure-Property-Process linkages in aging of Al6061 aluminum alloy through multi model experimental methods Mechanical testing: • Tensile testing • Spherical indentation Microscopy technique: • SEM • EBSD • OM
- 3. • Al6061 application • Aging process • Mechanical Properties
- 4. Salient Microstructural Features • Grain size, shape, and texture • Constituent particle size, volume fraction, distribution, and spacing • Precipitate size, volume fraction, and spacing
- 5. Grain Size, Shape, and Texture Inverse pole figure map An inverse pole figure shows the position of a sample direction relative to the crystal reference frame. In terms of IPF map in EBSD, each color represent three euler angle that transform the sample frame to the crystal frame. As-received sample
- 6. Grain size distribution Grain size distribution is calculated based on equivalent diameter values. The equivalent diameter is the diameter of a circle that gives the same area as the one for that grain. D
- 8. Aged at 400F for 2 hrs
- 9. Aged at 525F for 2 hrs
- 10. Aged at 650F for 2 hrs
- 11. Aged at 775F for 2 hrs
- 12. Grain aspect ratio distribution One measure of the shape of grains in EBSD scan is the aspect ratio. The aspect ratio is defined as the length of the minor axis divided by the length of the major axis and thus ranges from 0 to 1 a b Grain aspect ratio = 푏 푎
- 14. Aged at 400F for 2 hrs
- 15. Aged at 525F for 2 hrs
- 16. Aged at 650F for 2 hrs
- 17. Aged at 775F for 2 hrs
- 18. Texture The full 3D representation of crystallographic texture is given by the orientation distribution function (ODF). The ODF is defined as the volume fraction of grains with a certain orientation g.
- 20. Aged at 400F for 2 hrs
- 21. Aged at 525F for 2 hrs
- 22. Aged at 650F for 2 hrs
- 23. Aged at 775F for 2 hrs
- 24. Constituent particle size, volume fraction, distribution, and spacing
- 26. Original Image Corrected Image Segmented Image 400 775
- 27. Volume fraction- Constituent particle AR 400F 525F 650F 775F Image 1 0.032904 0.041857 0.036041 0.051641 0.097341 Image 2 0.023965 0.043686 0.035519 0.060976 0.103627 Image 3 0.024079 0.040578 0.031837 0.054671 0.111044 Image 4 0.027179 0.039005 0.045656 0.054723 0.092842 Image 5 0.027323 0.041474 0.036051 0.054555 0.106871 Image 6 0.024258 0.038561 0.034232 0.057636 0.106811 Image 7 0.028309 0.036217 0.028897 0.054658 0.089563 Image 8 0.021637 0.03788 0.029157 0.058748 0.084825 Image 9 0.026702 0.035803 0.099341 0.104465 Image 10 0.020928 0.041351 0.046461 0.089996 Average 0.025728 0.039641 0.034674 0.059341 0.098739
- 28. Particle Spacing- Chord length on matrix 0 50 100 150 200 250 300 350 400 450 500 3 2 1 0 x 10 -4 Number of Pixels Frequency AR 400 F 525 F 650 F 775 F
- 29. 4 2 0 -2 -4 -6 -8 -10 -2 -1.5 -1 -0.5 0 0.5 1 x 10 -3 -12 x 10 -4 PC 1 PC 2 AR 400 F 525 F 650 F 775 F 2 1.5 1 0.5 0 -0.5 -1 -2 -1.5 -1 -0.5 0 0.5 1 x 10 -3 -1.5 x 10 -4 PC 1 PC 3 PCA on Chord Length
- 30. 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -30 -20 -10 0 10 20 30 40 50 PC 1 PC 2 AR 400 F 525 F 650 F 775 F 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -30 -20 -10 0 10 20 30 40 50 PC 1 PC 3 PCA on 2 point Stats
- 31. 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -50 -40 -30 -20 -10 0 10 20 30 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 AR 400 F 525 F 650 F 775 F PCA on 2 point Stats + Chord Length -0.8 PC 1 PC 2 -50 -40 -30 -20 -10 0 10 20 30 PC 1 PC 3
- 32. Precipitate size, volume fraction, and spacing
- 34. 0.5 0.4 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -30 -25 -20 -15 -10 -5 0 5 10 PC 1 PC 2 525 F 650 F 775 F 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 -0.5 0 0.5 PC 2 PC 3
- 35. High Throughput Experiments • Local properties • Local microstructure
- 38. 150 200 250 0.04 0.03 0.02 150 200 250 150 200 250 0.04 0.03 0.02 0.01 150 200 250 0.04 0.03 0.02 150 200 250 150 200 250 0.04 0.03 0.02 0.01 150 200 250 0.04 0.03 0.02 150 150 200 250 0.04 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 150 200 250 0.03 0.02 0.01 150 200 250 0.04 0.03 0.02 150 200 250 150 200 250 0.04 0.03 0.02 0.01 150 200 250 0.03 0.02 200 150 200 250 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 150 200 250 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 150 200 250 0.03 0.02 0.01 150 200 250 0.03 0.02 250 150 200 250 0.03 0.02 0.01 0.04 0.03 0.02 200 250 0.01 150 200 250 0.04 0.03 0.02 150 200 250 0.01 150 200 250 0.04 0.03 0.02 150 200 250 0.01 0.03 0.02 200 250 0.01 150 200 250 0.04 0.03 0.02 150 200 250 0.01 150 200 250 0.03 0.02 150 200 250 0.01 0.03 0.02 200 250 0.01 150 200 250 0.03 0.02 150 200 250 0.01 150 200 250 0.03 0.02 150 200 250 0.01 0.01 150 200 250 0.01 150 200 250 0.01 0.01 150 200 250 0.01 150 200 250 0.01 0.01 150 200 250 0.01 150 200 250 0.01 00 f r 150 200 250 0.04 0.03 0.02 0.01 150 200 250
- 39. 525 F
- 40. 00 f r 0.03 0.02 150 0.03 0.02 200 250 150 200 250 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 150 200 250 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 150 200 250 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 0.01 150 200 250 0.04 0.03 0.02 150 200 250 150 200 250 0.04 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 150 200 250 0.03 0.02 0.01 150 200 250 0.03 0.02 150 200 250 0.01 150 200 250 0.025 0.02 0.015 0.01 150 200 250 150 200 250 0.025 0.02 0.015 0.01 0.005 150 200 250 0.025 0.02 0.015 0.01 150 200 250 0.025 0.02 0.015 0.01 0.005 0.03 0.02 200 250 0.01 150 200 250 0.03 0.02 150 200 250 0.01 150 200 250 0.03 0.02 150 200 250 0.01 0.04 0.03 0.02 200 250 0.01 150 200 250 0.03 0.02 150 200 250 0.01 150 200 250 0.03 0.02 150 200 250 0.01 0.025 0.02 0.015 0.01 200 250 0.005 150 200 250 0.025 0.02 0.015 0.01 150 200 250 0.005 0.01 150 200 250 0.01 150 200 250 0.01 0.01 150 200 250 0.01 150 200 250 0.01 0.005 150 200 250 0.005
- 41. 00 f r 150 200 250 150 200 250 0.03 0.02 0.01 11 f r 150 200 250 150 200 250 0.96 0.95 0.94 0.93