Open Postdoctoral Position in In-situ Transmission Electron Microscopy at MIT

Open Postdoctoral Position in In-situ Transmission Electron Microscopy

Department of Materials Science and Engineering, MIT

A postdoctoral position is available in the Department of Materials Science and Engineering (DMSE) at MIT, Cambridge, Gradečak Laboratory. The goal of this project is to combine in situ transmission microscopy (TEM) and atomistic modeling (separate but related project led by Prof. Michael Demkowicz, DMSE) to determine the relationship between the structure of “weakest link” interfaces in Ni-base superalloys and the conditions under which they undergo ductile-to-brittle transitions in the presence of H. This information may then be used to a) improve lifetime predictions based on analysis of microstructures and b) enable the selection of new alloys with reduced susceptibility to H embrittlement by specifying grain boundary content.

We will carry out in situ TEM observations of the H-induced failure of the microstructural features during mechanical loading. In-situ TEM and scanning electron microscopy (SEM) coupled with high-resolution chemical analysis will be used to investigate the sample response as a function of temperature, H exposure, and straining. First, H-induced decohesion and dislocation formation/motion will be investigated in a set of model alloys using in-situ TEM straining in combination with heating. H accumulation at precipitates and possible hydride phase formation will be investigated using energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS) and aberration-corrected scanning transmission electron microscopy. Finally, gas and fluid cell compatible holders (with possible straining capabilities) will be used to investigate in-situ sample response to hydrogen environments.

The candidate should have a PhD in Materials Science, Physics, or equivalent, and have extensive experience with materials characterization by TEM. Good communication skills in spoken and written English are essential. To apply, please send a cover letter and CV including contact information for three references to:

Prof. Silvija Gradečak

MIT, DMSE

77 Massachusetts Avenue, Room 13-5094

Cambridge, MA 02141

USA

Email: gradecak@mit.edu

Phone: +1 617 953 9211