Jake, Andrew, Leo and Jack will work on Ni-based and Cu-based metal-intermetallic nanostructured composite for this summer in my laboratory. Welcome all!

Roman Kositski, Oleg Kovalenko, Seok-Woo Lee, Julia R. Greer, Eugen Rabkin, Dan Mordehai, “Cross-split of dislocations: an athermal and rapid plasticity mechanism,”Nature Scientific Report 2 25966 (2016) – [link].

 

[Abstract]: The pathways by which dislocations, line defects within the lattice structure, overcome microstructural obstacles represent a key aspect in understanding the main mechanisms that control mechanical properties of ductile crystalline materials. While edge dislocations were believed to change their glide plane only by a slow, non-conservative, thermally activated motion, we suggest the existence of a rapid conservative athermal mechanism, by which the arrested edge dislocations split into two other edge dislocations that glide on two different crystallographic planes. This discovered mechanism, for which we coined a term “cross-split of edge dislocations”, is a unique and collective phenomenon, which is triggered by an interaction with another same-sign pre-existing edge dislocation. This mechanism is demonstrated for faceted α-Fe nanoparticles under compression, in which we propose that cross-split of arrested edge dislocations is resulting in a strain burst. The cross-split mechanism provides an efficient pathway for edge dislocations to overcome planar obstacles.

 

Lee’s Capstone Senior Design Team (Michael McGeever, Jeremy Higgins and Amy Hernadez) won the second place ($1,000) in the MSE final Capstone presentation! I am very proud of their achievement over the year! The title of the project was “Reliable rapid repair using additive manufacturing (sponsored by Sikorsky).”

 

(From left to right: Jeremy, Mike, and Amy)

John and Keith participated in ASM materials camp. About 80 high school students visited UConn MSE, and learned about Materials Science and Engineering.

     

Seok-Woo gave an invited talk at ASM international symposium at GE (April 20, 2016). The talk title was “Giant superelasticity and ultra-low temperature shape memory effects of novel intermetallic compound CaFe2As2.”

Keith gave a presentation at ASM Hartford Chapter (April. 12, 2016). His presentation title was “Strong, ductile, and thermally stable Cu-based metal-intermetallic nanostructured composites.”

Keith won the first place in the 2nd annual micrograph contest, which was run by Keramos UConn Chapter! Congratulations!

    

 

Keith won the 3rd place in the annual SOE poster competition!!! (Feb. 25, 2016). This success is also highlighted at the UConn MSE website [“Keith Dusoe shines with metallic alloys poster.”, link].

Many congratulations!!

Keith and John attended the annual SOE graduate student poster competition at UConn on Feb. 25, 2016.

Keith’s poster title is “Strong, ductile and thermally stable Cu-based nanocomposite [link]”

John’s poster title is “Giant super-elasticity of novel intermetallic compound CaFe2As2 [link]”.

  Keith

  John

 

Gyuho successfully passed his master defense exam on Feb. 22, 2016! Many many congratulations!

The title of this thesis talk was “Study of seal glass for sodium sulfur batter”. This work was done at C2E2 with Dr. Manoj Kumar Mahapatra before joining my group.