Featured Research

from universities, journals, and other organizations

Neutron tomography technique reveals phase fractions of crystalline materials in 3-dimensions

Date:
July 31, 2014
Source:
Helmholtz-Zentrum Berlin für Materialien und Energie
Summary:
Researchers have developed a novel method, based on energy-selective neutron imaging for visualization of crystalline phase distributions within the bulk of metallic samples.

Researchers at Helmholtz-Zentrum Berlin (HZB) and The University of Tennessee Knoxville (UTK) developed a novel method, based on energy-selective neutron imaging for visualization of crystalline phase distributions within the bulk of metallic samples.

The method overcomes limitations of existing techniques which are limited to the surface or small-sized specimens, and allows a 3-D representation of the phase fractions within the sample volume. The work has just been published in the journal Advanced Materials.

"For many engineering applications it is of major importance to characterize the bulk of materials spatially, instead of only probing selected locations. The new method provides exactly that capability, and the HZB-UTK team has demonstrated it by using samples made from stainless steel that undergo a phase transformation after being subjected to tensile and torsional deformation.," said Prof. Dayakar Penumadu from UTK. He and UTK Ph.D. student Robin Woracek collaborated with the researchers Ingo Manke, Nikolay Kardjilov and André Hilger from the Imaging Group at the Institute of Applied Materials (F-IAM) at HZB on establishing new quantitative imaging methods by making use of diffraction contrast due to Bragg scattering in polycrystalline materials. Since the measurement method uses neutrons of selected wavelengths, the current work will also pave the way to implement such methods at Spallation Neutron Sources. The investigations were performed at the recently upgraded neutron imaging beamline CONRAD at BERII, which provides optimal instrumentation conditions for such measurements.

The present results provide phase fractions of Austenite and Martensite within the volume of the circular samples. They had a diameter of 8 mm, and CONRAD allowed measuring five samples simultaneously. The tensile samples show highest degree of phase transformation in the necking region as expected, while for the torsion samples the phase transformation increases from the center towards the surface in the radial direction. The quantitative results were confirmed and show excellent agreement for selected locations, using the Residual Stress Analysis and Texture Diffractometer (E3) at the Department Microstructure and Residual Stress Analysis (F-AME) at HZB (collaborator M. Boin).

The investigated stainless steels are widely used, e.g., as automotive and aerospace structural alloys, for major appliances, household items and buildings. The new characterization method can be used to improve both material properties and manufacturing processes. However, the same method is naturally applicable to a wide range of natural and advanced materials, and it has the invaluable advantage of being able to reveal inhomogeneities within the measured volume, which may remain undetected using common techniques.

This new characterization technique is expected to have a major immediate impact in developing super-elastic and shape memory alloys, which are of tremendous importance in the medical field also.


Story Source:

The above story is based on materials provided by Helmholtz-Zentrum Berlin für Materialien und Energie. Note: Materials may be edited for content and length.


Journal Reference:

  1. Robin Woracek, Dayakar Penumadu, Nikolay Kardjilov, Andre Hilger, Mirko Boin, John Banhart, Ingo Manke. 3D Mapping of Crystallographic Phase Distribution using Energy-Selective Neutron Tomography. Advanced Materials, 2014; 26 (24): 4069 DOI: 10.1002/adma.201400192

Cite This Page:

Helmholtz-Zentrum Berlin für Materialien und Energie. "Neutron tomography technique reveals phase fractions of crystalline materials in 3-dimensions." ScienceDaily. ScienceDaily, 31 July 2014. <www.sciencedaily.com/releases/2014/07/140731095138.htm>.
Helmholtz-Zentrum Berlin für Materialien und Energie. (2014, July 31). Neutron tomography technique reveals phase fractions of crystalline materials in 3-dimensions. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2014/07/140731095138.htm
Helmholtz-Zentrum Berlin für Materialien und Energie. "Neutron tomography technique reveals phase fractions of crystalline materials in 3-dimensions." ScienceDaily. www.sciencedaily.com/releases/2014/07/140731095138.htm (accessed September 16, 2014).

Share This



More Matter & Energy News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Space Race Pits Bezos Vs Musk

Space Race Pits Bezos Vs Musk

Reuters - Business Video Online (Sep. 16, 2014) — Amazon CEO Jeff Bezos' startup will team up with Boeing and Lockheed to develop rocket engines as Elon Musk races to have his rockets certified. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Manufacturer Prints 3-D Car In Record Time

Manufacturer Prints 3-D Car In Record Time

Newsy (Sep. 15, 2014) — Automobile manufacturer Local Motors created a drivable electric car using a 3-D printer. Printing the body only took 44 hours. Video provided by Newsy
Powered by NewsLook.com
Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Refurbished New York Subway Tunnel Unveiled After Sandy Damage

Reuters - US Online Video (Sep. 15, 2014) — New York officials unveil subway tunnels that were refurbished after Superstorm Sandy. Nathan Frandino reports. Video provided by Reuters
Powered by NewsLook.com
Frustration As Drone Industry Outpaces Regulation In U.S.

Frustration As Drone Industry Outpaces Regulation In U.S.

Newsy (Sep. 14, 2014) — U.S. firms worry they’re falling behind in the marketplace as the FAA considers how to regulate commercial drones. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

      Technology News



      Save/Print:
      Share:  

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile iPhone Android Web
      Follow Facebook Twitter Google+
      Subscribe RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins