NEW:Update 98

The 13th annual National Educator's Workshop (NEW:Update 98) was held at Brookhaven National Laboratory from November 1-4, 1998.  This workshop gives instructors a venue for sharing tips, tricks and experiments used in the materials science laboratory courses being taught at universities, community colleges and technical schools and even high schools across the country and even from Central America.  The workshop was organized by Jim Jacobs at Norfolk State University and it was sponsored by Brookhaven National Laboratory, NASA, Columbia University and Gateway Coalition, Stony Brook University of New York, Norfolk State University, and NIST. 

Underlying Structure of Engineering Materials
Authors: Mike Meier, Karl Ewald
This paper described the making of two videos that show the tensile deformation of 70/30 brass as seen through a stereo-zoom microscope.  The main point we were trying to make with these videos was the materials we use have their own "internal" structure and that this structure largely determines the properties of the material.

In the first video we start by showing the smooth, yellow surface of the polished brass tensile specimen.  Soon after deformation begins the microstructure appears to emerge from below the surface.  One can see grains, twins and an occasional deformation band.  As the tensile test proceeds the grains become longer and the surface of the specimen becomes very rough.  In the latter part of the test deformation is no longer a smooth, continuous process.  The specimen alternately elongates and then contracts laterally.

In the second video we start by showing a polished and etched specimen.  The structure is apparent at the outset but when we start to deform the specimen, this time at one tenth the rate as in the first video, one can clearly see deformation bands form.

These video are no longer available for downloading but you can see them on Vimeo, and in the embeds above. If you'd like a DVD containing these and the Lüders Bands video just drop me an email and I'll send you one.

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Artificial Microstructures
Author: Mike Meier
The paper on artificial microstructures described now to generate fairly realistic and also schematic microstructures that one can use in a number of classroom demonstrations and exercises. These images included the following:

All of these images plus a sample exercise are available here for downloading. I have put them all into a single self-extracting file.

Basic microstructure, includes DIC effects
An example of an artificial microstructure
of a single-phase material.

Illustration of recrystallization and persistent banding
A series of images generated using adobe Photoshop that show how cold rolling will
deform the grains and subsequent annealing will lead to recrystallization and grain
growth, but will also lead to persistent banding.

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