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mohsenzaeem's picture

Investigating phase formations in cast AlFeCoNiCu high entropy alloys by combination of computational modeling and experiments

Selection and thermal stability of phases are important in design of high entropy alloys (HEA). In this study, phase formations in cast AlFeCoNiCu HEA were investigated. Ab-initio molecular dynamics (AIMD) simulations were used to determine crystal structures of phases at different temperatures in equiatomic composition of AlFeCoNiCu. The AIMD results showed a possible coexistence of a face-centered cubic (fcc) phase and a bodycentered cubic (bcc) phase at the room temperature and indicated stabilization of a single fcc phase above 1070 K at the equiatomic composition of AlFeCoNiCu.

Is there a way to measure the magnitude of a dislocation burger's vector via high precision optical microscopes?

I need to calculate the size or magnitude of the burger's vector of a dislocation in crystalline materials, metals. Obviously and typically, it can be measured via XRD or the electron microscopy methods, TEM and SEM. The question is:

could it also be measured via high precision optical microscopes, as precise as 1nm ?

Post-Doctoral Researcher - Fatigue/Fracture of Materials

DEPARTMENT:  Department of Energy

AGENCY:  National Energy Technology Laboratory

LEVEL:  Post-Doctoral

POSITION INFORMATION:  Temporary, 12 months full-time with the possibility of extension

DUTY LOCATION:  Albany, Oregon

Post-Doctoral Researcher in Materials Science and Engineering

 

 

DEPARTMENT:  U.S. Department of Energy

 

AGENCY:  National Energy Technology Laboratory

 

LEVEL:  Post-Doctoral

 

POSITION INFORMATION:  Temporary, 12 months full-time with the possibility of extension

 

DUTY LOCATION:  Albany, Oregon

yann.charles's picture

Available PhD position in material science at LSPM - Paris, france

no longer available.

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Multi-Components Refractory Metallic Alloys with a High Mixing Entropy: Formulation, Microstructural Evolution and Behavior under large Deformation

hutapea's picture

Scanning Electron Microscope (SEM) Specialist/Research Professor Position at Temple University, Composites Laboratory

This position will support all activities in a SEM/microscopy lab including sample preparation, inspection, documentation, and elemental analysis by SEM-EDS as well as managing the operation of the lab. The candidate may be required to teach courses in related areas.

Post-doc, JRC-Petten: Microstructural characterisation of materials and mechanical property correlation

The Joint Research Centre of the European Commission,Insitute for Energy (IET), in Petten Nehterlands, is looking for a motivated scientist or engineer at post-doctoral level to work on characterization of primarily metallic materials for nuclear reactors using a combination of techniques such as scanning and transmission electron microscopy (SEM and TEM), energy-dispersive X-ray spectroscopy (EDX), Xray diffraction (XRD), and 3D X-ray tomography.  (see attachment)

2012 SEM Northeast Graduate Student Symposium

2012 Northeast Society for Experimental Mechanics (SEM) Graduate Student Symposium is being arranged in University of Maryland, College Park. Please feel free to express interest. Any graduate student working in the Experimental Mechanics area is welcome to present their research work. Flyer attached.

 

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Fracture initiation in NiTi

Hi!

I am investigating the effect of triaxial stress state on the superelastic behavior in NiTi. In this regard I have conducted some simple tensile tests on notched specimen until fracture. The next step is to investigate the fracture surfaces in SEM to determine point of initiation and the structures. However, as my knowledge in fractography is limited at best, I am not really sure what to look for to determine eg. fracture initiation.

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