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DRSA Inreach

Internal Stresses in Aluminum Engines. Neutrons. DRSA Inreach. Measuring Residual Stresses. Introduction of research project Solidification of casting alloys Stresses and strains Crystal lattices Diffraction Neutrons Experimental design Data Analysis of data.

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DRSA Inreach

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  1. Internal Stresses in Aluminum Engines Neutrons DRSA Inreach

  2. Measuring Residual Stresses • Introduction of research project • Solidification of casting alloys • Stresses and strains • Crystal lattices • Diffraction • Neutrons • Experimental design • Data • Analysis of data

  3. What Waves Will We Use • Wavelength about 2 Å • Go through several cm of Al

  4. Possible Waves • Light • Wrong wavelength, absorbed • X-rays • Wavelength OK, strongly absorbed • Electrons • Wavelength OK, very strongly absorbed (penetrate less than a mm) • Neutrons • Wavelength OK, able to pass through many cm of Al • We chose neutrons

  5. What is a Neutron? • Subatomic particle • Discovered in 1932 • Electrically neutral • With protons, they form nuclei • Stable in the nucleus • Unstable when free, half-life 10 minutes and 11 seconds when free, beta decay (neutron turns into a proton, electron and electron antineutrino) • Able to penetrate matter because electrically neutral • About the same mass as a proton

  6. NRU Reactor

  7. What makes the Reactor Go? • Fuel is metallic composite containing uranium enriched in U235 • U235 is a fissile isotope of uranium • So what does fissile mean?

  8. What makes the Reactor Go? • So answer the question, what makes the reactor go? • A chain reaction…

  9. What makes the Reactor Go? • Then what’s all the water in there for? • Neutrons ejected from fission are going too fast for U235 nuclei to capture them. • The water slows them down.

  10. McMaster Reactor

  11. Monochromation

  12. Bragg’s Law Sample Reactor

  13. Diffraction

  14. Next Week… • …how do we design an experiment using neutrons

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