About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
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Symposium
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Fracture in Metals: Insights from Experiments and Modeling Across Length and Time Scales
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Presentation Title |
Microcantilever Testing for Brittle-To-Ductile Transition Temperatures |
Author(s) |
Gregory B. Thompson, Md Tariqul Islam, Hunter Brumblay, Christopher Weinberger |
On-Site Speaker (Planned) |
Gregory B. Thompson |
Abstract Scope |
With the advent of Focused Ion Beam (FIB) or Plasma FIB (PFIB) procedures, one can readily make sample geometries that characterize the Brittle-to-Ductile Temperature Transition (BDTT) in smaller volumes of materials. Nevertheless, for samples too small, size dependent responses occur requiring appropriate geometries that may still be too arduous to mill. Here, we report a rapid means of preparing microcantilever beams through coupled electro-jet polishing and milling procedures. As part of our FIBing, we also evaluate the notch fabrication, quantifying an inverted parabolic profile from the exterior surfaces to the internal regions within the cantilever that is dependent on milling current and cantilever location to a free surface. The effect of the notch depth and shape are then discussed with respect to the measured fracture toughness. Using this collective information, a series of different notch depths are produced to study their influence on the BDTT response guided by model development. |