ASTM E82 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 for cubic crystals. It can be applied equally well to hexagonal, tetragonal, or orthorhombic crystals.
ASTM E82 Test Method for Determining the Orientation of a Metal Crystal
What is ASTM E82?
ASTM E82 Sample Preparation Guide
For ASTM E82 testing, 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. Using an adjustable fixed holder that can later be mounted on a saw, lathe, or other machine, a single crystal material can be moved to a preferred orientation and subsequently sectioned, ground, or otherwise processed.
What is the Testing Procedure and Requirement of ASTM E82?
In the ASTM E82 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.
Analysis Result and Interpretation
ASTM E82 test method covers the back-reflection Laue procedure for determining the orientation of a metal crystal. The following data are used in ASTM E82 testing:
- 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 center 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.
Updated on August 8, 2026
Testimonials
Real results
Engineers trust us with what matters most
“We had a great experience working with this company for our ASTM E84 testing. They were the first company to respond to our inquiry within just a few minutes of submitting it. From start to finish, the communication was excellent, and the entire process was swift, straightforward, and hassle-free.”
“Very good communication, testing associates were very patient with delays on our end. Reasonable turnaround time for results and nicely detailed report. Analysts were also quick to answer any follow-up questions. Happy with results.”
“Matestlab connected us with an accredited lab within days, cutting weeks off our product validation timeline.”
Start Your Testing
Project Today
Project Today
Define your requirements and get access to
specialized laboratories ready to deliver results
specialized laboratories ready to deliver results
Start Testing
Partners with us
Clients
Vendors