The DCG will be hosting several research interns this summer. These students will design and complete a hands-on laboratory research project, under the guidance of graduate students in the group.
The interns include:
Dr. Taheri and colleagues’ latest paper, titled “Phase transformation study in Nb-Mo microalloyed steels using dilatometry and EBSD quantification” has been published online in the journal Metallurgical and Materials Transactions A.
From the abstract: “A complete microstructural characterization and phase transformation analysis has been performed for several Nb and Nb-Mo microalloyed low-carbon steels using electron backscattered diffraction (EBSD) and dilatometry tests. Compression thermomechanical schedules were designed resulting in the undeformed and deformed austenite structures before final transformation. The effects of microalloying additions and accumulated deformation were analyzed after CCT diagram development and microstructural quantification. . . .This article shows the complex interactions between chemical composition, deformation, and the phases formed, as well as their effect on microstructural unit sizes and homogeneity.”
The paper can be viewed directly here.
The paper can also be accessed on the Springer website: Springer Verlag.
Greg Vetterick has won third place in the annual ASM Liberty Bell Chapter Meeting poster competition for his work titled, “Linking the correlated dependence of grain boundary structure and density to defect evolution mechanisms during radiation damage: toward radiation tolerant alloy design.” In addition to receiving a $200 prize, Greg also presented a 15 minute talk about his work.
Click here to learn more about the ASM Liberty Bell Chapter.
Steven Spurgeon has published a research highlight in the Materials Research Society Bulletin‘s April 2013 issue discussing laser-induced demagnetization in nickel thin films.
From the article: “The mechanics of laser-induced demagnetization has attracted considerable attention in efforts to develop fast switching optomagnetic logic devices. A femtosecond laser pulse for instance can demagnetize a ferromagnet within a few hundred femtoseconds. Various theories have been proposed to explain how an ultrafast laser pulse can demagnetize a magnetic thin film, ranging from indirect spin-flip scattering to direct laser-induced spin flips. Now, A. Eschenlohr, M. Battiato, and colleagues at Helmholtz Zentrum Berlin and Uppsala University propose that a novel mechanism of superdiffusive electron transport drives the demagnetization. . . .”
The article can be viewed directly here or on the Materials Research Society Bulletin website.
Dr. Taheri and colleagues’ latest paper, titled “A (S)TEM gas cell holder with localized laser heating for in situ experiments” has been published online in the journal Microscopy and Microanalysis.
From the abstract: “The advent of aberration correction for transmission electron microscopy has transformed atomic resolution imaging into a nearly routine technique for structural analysis. Now an emerging frontier in electron microscopy is the development of in situ capabilities to observe reactions at atomic resolution in real time and within realistic environments. Here we present a new in situ gas cell holder that is designed for compatibility with a wide variety of sample type. . .”
A pre-print of the paper can be viewed directly here.
The paper can also be accessed on the Cambridge website: Microscopy and Microanalysis.
DCG students James Nathaniel, Wayne Harlow, and Katie Jo Sunday attended Arizona State University’s 2013 Winter School on High Resolution Electron Microscopy in January. James was also awarded a scholarship to cover tuition and help defray travel costs to attend the workshop.
The ASU Winter School is a prestigious workshop held every year by leaders in electron microscopy. From the school’s website, “The aim of the school is to introduce the theory and practice of high resolution electron microscopy to scientists currently using transmission electron microscopes for materials science studies.”
For more information, visit: ASU Winter Microscopy School
Steven Spurgeon has been awarded a travel grant to attend the American Physical Society March 2013 meeting in Baltimore, Maryland. The grant was awarded by the Topical Group on Magnetism and its Applications (GMAG) and covers $250 in travel expenses to attend the conference.
For more details on the APS GMAG, visit: APS GMAG Topical Group
For more details on the APS March Meeting 2013, visit: APS March Meeting 2013
Chris Winkler, Michael Jablonski, Dr. Taheri, and colleagues’ latest paper, titled “Accessing intermediate ferroelectric switching regimes with time-resolved transmission electron microscopy” has been published online in the Journal of Applied Physics.
From the abstract: “BiFeO3 (BFO) is one of the most widely studied magneto-electric multiferroics. The magneto-electric coupling in BiFeO3, which allows for the control of the ferroelectric and magnetic domain structures via applied electric fields, can be used to incorporate BiFeO3 into novel spintronics devices and sensors. Before BiFeO3 can be integrated into such devices, however, a better understanding of the dynamics of ferroelectric switching, particularly in the vicinity of extended defects, is needed. We use in situ transmission electron microscopy (TEM) to investigate the response of ferroelectric domains within BiFeO3 thin films to applied electric fields at high temporal and spatial resolution. This technique is well suited to imaging the observed intermediate ferroelectric switching regimes, which occur on a time- and length-scale that are too fine to study via conventional scanning-probe techniques. . .”
The paper can be viewed directly here.
The paper can also be accessed on the AIP website: Journal of Applied Physics.
Steven Spurgeon has published an article in the Materials Research Society Bulletin‘s October 2012 issue highlighting Philly Materials Day. The article describes the planning and execution of this annual event by faculty at Drexel and the University of Pennsylvania.
From the article: “For a discipline that can be traced back to the construction of the pyramids and the forging of ancient bronze weapons, materials science is still a largely unknown branch of science. Last year, when the US Public Broadcasting Service (PBS) decided to air the NOVA series titled “Making Stuff,” faculty at Drexel University in Philadelphia saw an opportunity to draw attention to the study of solids. . . .”
The article can be viewed directly here or on the Materials Research Society Bulletin website.
More information on Philly Materials Day can be found here.
Also in this issue, Spurgeon describes recent research on room-temperature ferromagnetic spin bags in Sr3YCo4O10+δ oxides. That article is available here or on the Materials Research Society Bulletin website.
SENSORS summer student Maza Brady has received an award for best poster in the National Science Foundation Research Experiences for Undergraduates (REU) summer program.
Maza’s poster, titled “Thermomechanical Processing of Aluminum Alloy to Increase Corrosion Resistance,” was selected among dozens of participants. Maza will be returning to the Santa Clara University to finish her undergraduate degree and plans to enroll in a graduate program in environmental robotics after graduation.
For more information about the REU SENSORS program, please visit: Drexel REU SENSORS
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