[LAGS] LAGS Meeting Tuesday, May 18 - Amy Clarke, speaker

[Emily]

Greetings LAGS Members!

(apologies in advance for multiple postings.)

Please join your fellow club members at our May meeting, Tuesday May
18, beginning at 7:30pm at the Christian Church in Los Alamos.

This month's speaker is Dr. Amy Clarke, a postdoctoral research
associate in the Materials Science and Technology (MST) Division at
LANL.

Dr. Clarke will be presenting an interesting talk about metallurgy and
crystallography.

Talk title:
Shape Memory Effect Deformation Structures in U-14at.%Nb Martensite

Abstract:
The shape memory effect occurs when a deformed material returns back
to its original shape upon heating. The related superelastic effect
occurs when a deformed material springs back to its original shape
immediately upon releasing the stress (without reheating). The most
common material that exhibits the shape memory effect is NiTi
(“Nitinol”), which has applications ranging from eyeglass frames to
medical devices. Shape memory behavior is also exhibited by the
U-14at.%Nb alloy. The shape memory effect is made possible by a
“Martensitic” transformation, in which the crystal structure
transforms from a high temperature “parent” phase to the new
“Martensite” phase during quenching from high temperature by means of
a deformation of its lattice (referred to as the transformation
strain). During deformation, the applied strain is accommodated by
the transformation strain of the Martensite. When transformation
takes place from the high symmetry parent phase to the low symmetry
Martensite, twelve different orientations of the Martensite are formed
(i.e. 12 different orientations of the transformation strain).
Therefore, arbitrary deformation can be easily accommodated. In this
talk, the fascinating crystallography associated with the shape memory
effect will be explained and examples from the U-14at%Nb alloy will be
presented.

Speaker Biography:
Dr. Amy Clarke is a postdoctoral research associate in the Materials
Science and Technology Division at Los Alamos National Laboratory.
Dr. Clarke studies shape memory effect deformation structures in
metals using electron microscopy. She received her B.S. degree in
Metallurgical and Materials Engineering from Michigan Technological
University and her M.S. and Ph.D. degrees in Metallurgical and
Materials Engineering from the Colorado School of Mines, where she
studied ferrous physical metallurgy at the Advanced Steel Processing
and Products Research Center. Dr. Clarke is actively involved in The
Minerals, Metals & Materials Society (TMS) and the Association for
Iron and Steel Technology; she also holds a number of committee
positions within these professional organizations and was recently
selected by TMS to be a Young Leader International Scholar to Japan.
Dr. Clarke is also a member of ASM International and serves as the Los
Alamos Chapter secretary.

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