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Los Alamos and Albuquerque Joint Chapter Meeting

  • November 08, 2017
  • Blue Corn Cafe, 133 Water St. Santa Fe, NM
  • Santa Fe , NM , USA

Description

Strength at Pressure

Presenting: Dr. Ellen Cerreta, M-DO, Los Alamos National Laboratory, ASM Board of Trustees, ASM Fellow

Wednesday, November 8th 2017 6:00pm

Abstract:

Under conditions of static and dynamic loading to high pressures or stresses, it can be critical to quantify the strength of a material and it is well understood that material microstructure controls properties like strength.  It is also expected that microstructures, particularly for many important structural metals like iron and titanium, are evolved or modified in significant ways when subjected to high stresses.  These modifications include microstructural refinement due to twinning, significant storage of plastic work within grains, and even phase change.   Therefore, it follows that the strength of the material under stress is dependent on the microstructure evolved under stress.  This is problematic, as until recently the materials science and physics communities have been limited to post mortem interrogation of materials exposed to high stresses and little is quantified about the actual microstructures under load.  Current predictive capabilities for strength under high stress utilize the known microstructures prior to loading and under moderate stress conditions.  Post mortem investigations of material subjected to extremes of stress indicate that this may be problematic. 

Here, recent work on titanium and zirconium metals that includes the use of current light sources, such as the Advanced Photon Source at Argonne National Laboratory, will be presented to discuss quantification of structure at high stresses.  This will be related to on-going efforts at Los Alamos National Laboratory to develop phase-aware, predictive modeling capabilities for material strength at pressure.  

Blue Corn Cafe

133 Water St. Santa Fe, NM

Wednesday, November 8, 2017

Networking: 6:00pm, Dinner 6:30pm, Presentation: 7:15pm

$10 for Members and Guests, $20 for non-members, $5 for students

Space is limited, please RSVP here by 5pm Monday, November 6th


 About the Speaker:

Ellen Cerreta is the Deputy Division Leader for The Explosive Science and Shock Physics Division, at Los Alamos National Laboratory.  She joined Los Alamos as a Post Doctoral Associate in 2001. Ellen received her BS in Aerospace Engineering from The University of Virginia and her Ph.D. in Materials Science and Engineering from Carnegie Mellon University.  Since coming to Los Alamos, she has focused on the correlation of microstructure to mechanical response of metals and alloys, with the support of the Office of Basic Energy Sciences, the national defense, global security, and Laboratory Directed Research and Development (LDRD).  Her research has had a focus on material behavior in dynamic loading environments.  Ellen is an adjunct faculty member in The Institute of Shock Physics at Washington State University and she joined the ASM Board of Trustees in October of 2015.  In 2016, she was awarded ASM Fellow.


 

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