Navigation Links
Building better structural materials
Date:12/13/2012

Washington, D.C. When materials are stressed, they eventually change shape. Initially these changes are elastic, and reverse when the stress is relieved. When the material's strength is exceeded, the changes become permanent. This could result in the material breaking or shattering, but it could also re-shape the material, such as a hammer denting a piece of metal. Understanding this last group of changes is the focus of research from a team including Carnegie's Ho-kwang "Dave" Mao.

Their breakthrough research on the behavior nickel nanocrystals under intense pressure is published December 14 by Science. Their findings could help physicists and engineers create stronger, longer-lasting materials. It can also help earth scientists understand tectonic events and seismicity.

It is believed that permanent changes to metallic grains when under pressure are associated with the movement of structural irregularities in the grains, called dislocations. But the deformation of nanocrystalline materials has been controversial because it was thought that below a certain grain size, the structural irregularities would not form and the deformation would be dictated by motions of the boundary between grains instead. According to computer analysis, this critical limit would occur in nanocrystals at sizes between 10 and 30 nm in size.

Experimental work on nanocrystals under pressure has been limited by technical hurdles. But new capabilities using a technique called radial diamond anvil cell x-ray diffraction has opened the door to moving beyond computer modeling and into the lab.

The team, led by Bin Chen of the Lawrence Berkeley National Laboratory, was able to show that the activities of the structural irregularities that accompany deformation were occurring even in nickel nanocrystals of 3 nanometers in size when they were compressed to higher than 183,000 times normal atmospheric pressure (18.5 gigapascals). This demonstrates that so-called dislocation-associated deformation is a function of both pressure and particle size, as previously thought, but that the particle size can be smaller than computer modeling had anticipated.

"These findings help constrain the fundamental physics of deformation under pressure on a very small scale," Mao said. "They also demonstrate the importance of the radial diamond anvil cell x-ray diffraction tool for helping us understand these processes."


'/>"/>

Contact: Ho-kwang Dave Mao
hmao@ciw.edu
202-478-8935
Carnegie Institution
Source:Eurekalert

Related biology technology :

1. HealthTech Capital Announces Awards for the HealthTech Conference 2012 - Building a Business in the New HealthTech Ecosystem
2. Building Wireless Solution More Important than Ever with New Tablets
3. New Study Building Framework to Bring Personalized Medicine to the Clinic
4. Arteriocyte Takes the Lead in Promoting Building Future Pipeline of Women in STEM Career Fields
5. Biobetters in Key Markets - Opportunities for Biotechnology Companies to Sustain Innovation with Low Risk and High Value Offerings
6. A better brain implant: Slim electrode cozies up to single neurons
7. Sitting still or going hunting: Which works better?
8. UMass Amherst, Harvard experts say better systems needed for medical device cybersecurity
9. Breathe Better With Clarity Allergy Center
10. Penn researchers study of phase change materials could lead to better computer memory
11. New research could mean faster computers and better mobile phones
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/14/2017)... -- The Alliance for Safe Biologic Medicines (ASBM) today issued ... guidance on biologic naming: We commend ... importance of distinct naming for all biologics, including biosimilars. ... will bring to patients, including new treatment options and ... the Guidance dealing with suffix design remains at odds ...
(Date:1/13/2017)... , Jan 13, 2017 Research and Markets ... report to their offering. ... The global biopolymers market to grow at a CAGR of 16.83% during ... and the growth prospects of the global biopolymers market for 2017-2021. To ... sale of sales of biopolymer products. The report also includes a a ...
(Date:1/13/2017)... ... 13, 2017 , ... FireflySci has been busy rolling out ... diverse customer base. The latest entry in this field is a series of ... Bio-Rad. FireflySci is introducing three distinct varieties including a 10x1mm, 10x2 and 10x4 ...
(Date:1/12/2017)... ... January 12, 2017 , ... ... VTI, Vertebral Technologies, Inc., announces the successful outcome of the first lumbar ... 2016, VTI (Vertebral Technologies, Inc.) has partnered with Mexico-based medical product company ...
Breaking Biology Technology:
(Date:12/15/2016)... 2016  There is much more to innovative access ... engine. Continental will demonstrate the intelligence of today,s solutions ... . Through the combination of the keyless entry and ... elements, the international technology company is opening up new ... "The integration of biometric elements brings our ...
(Date:12/8/2016)...  Singulex, Inc., the leader in Next Generation Immunodiagnostics ... license and supply agreement with Thermo Fisher Scientific, the ... access to Thermo Scientific BRAHMS PCT (Procalcitonin), a biomarker ... to diagnose systemic bacterial infection and sepsis and in ... in assessing the risk of critically ill patients for ...
(Date:12/7/2016)... , Dec. 7, 2016   Veridium ... announced the appointment of new CEO James ... executive with decades of experience, has served in ... Cisco, where he specialized in expanding a pipeline ... technology portfolios. He most recently served as managing ...
Breaking Biology News(10 mins):