ME 3701 Chapter : Experiment 1 X Ray Diffraction
Document Summary
Check the x-ray caution sign in the lab. The purpose of this experiment is to introduce students to the use of x-ray diffraction techniques for investigating various types of crystal structure encountered in metallic materials. The x-ray diffraction technique is used to determine the crystal structure and interatomic spacing of crystalline samples through constructive interference of reflected x-ray beams. X-ray diffraction data has been collected for a fcc aluminum sample and a bcc steel sample; the data will be analyzed to determine the lattice parameter and preferred orientations for these materials. Metallic and ceramic materials utilized in mechanical engineering applications have crystalline microstructures; many material properties are related to the atomic arrangement on various planes within the structures. Three basic crystal structures encountered in metallic materials are the body-centered cubic (bcc), face-centered. Cubic (fcc) and hexagonal close-packed (hcp) as illustrated in figure 1. (a) (b) (c) Figure 1 - atomic arrangement in common metallic crystal structures: a. )
