ASTM E82-09 Test Method for Determining the Orientation of a Metal Crystal

ASTM E82-09 Test Method for Determining the Orientation of a Metal Crystal

Metals and other materials are not always isotropic in their physical properties. Therefore, it is desirable or necessary to determine the orientation of a single crystal undergoing tests to ascertain the relation of any property to different directions in the material. ASTM E82-09 test method can be used commercially as a quality control test in production situations where the desired orientation, within prescribed limits, is required.

    Scope:

    ASTM E82-09 test method covers the back-reflection Laue procedure for determining the orientation of a metal crystal. The back-reflection Laue method for determining crystal orientation may be applied to micro grains (0.5-mm diameter or larger) within polycrystalline aggregates, as well as to single crystals of any size. The method is described concerning cubic crystals.  It can be applied equally well to hexagonal, tetragonal, or orthorhombic crystals.

    Test Procedure:

    ASTM E82-09 test method, the arrangement of the apparatus is similar to that of the transmission Laue method for crystal structure determination except that the photographic film is located between the X-ray source and the specimen. The beam of white X-radiation passes through a pinhole system and a hole in the photographic film strikes the crystal and is diffracted back onto the film. Dark spots, which represent X-ray beams “reflected” by the atomic planes within the specimen, appear on the developed film. The atomic planes these spots represent are identified by crystallographic procedures and the orientation of the metal crystal is determined. 

    C:\Users\priyanka\Pictures\New Picture.png

    Figure 1: Laue method for crystal structure determination

    Specimen size:

    The test specimen may be of any convenient size or shape. Normally, the orientation is determined with reference to a prepared surface and a line on this surface. 

    With the use of an adjustable fixed holder that can later be mounted on a saw, lathe, or other machines, a single crystal material can be moved to a preferred orientation, and subsequently sectioned, ground, or processed otherwise.

    Data

    X-Ray Tube – The tube voltage shall be near 50kVp. Back-Reflection Laue X-Ray Camera – The X-ray camera shall have a pinhole system about 6cm in length with openings of 1⁄4 to 1 mm, a flat, light-tight film holder (the hole in the centre of the film should be as small as possible, preferably about 1⁄8 in. (3.2 mm) in diameter), a specimen holder, and means for setting the crystal-to-film distance at 3.00 cm.

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
        •  

          STEP 01

          You share material and testing requirements with us

        •  

          STEP 02

          We ensure your sample pick-up in an ensured manner

        •  

          STEP 03

          We deliver test report to your inbox

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            idea icon
            Want to connect with an expert before you leave?