CWR Presents : Exceptional Properties by Design - NiTi-Nb nanowire in-situ Composites Extending the Boundaries. |
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It is challenging to develop bulk materials that exhibit large elastic strains, low Young's moduli and high strengths because of the intrinsic trade-off relationships among these properties. On the other hand, freestanding nanowires have exceptional properties, such as ultrahigh elastic strain limits (4–7%) and ultrahigh strengths (typically on the order of gigapascals).
With the fast development of our capability to produce more in variety, more in quantity and better in shape and size of nanowires, materials scientists and engineers have attempted to develop bulk composites reinforced with these nanowires for exceptional mechanical properties. However, results obtained in the past two decades have been disappointing, so much so that some leading scientists have declared (e.g., Dzenis, Science 319, 419 (2008)):
“The prospect of bulk structural supernanocomposites appears more remote now than it did just a few years ago.”
This situation has been dubbed “the valley of death” in Nano composite design.
A NiTi-Nb nanowire composite has just broken the spell, by realizing a set of properties unmatched by any existing material. This is achieved by using a new materials design concept of elastic strain coupling, in this case between a phase transforming NiTi matrix and super strong Nb nanowires. With this we have crossed “the valley of death”, and this seminar tells how.
(The work presented here has just been published in Science 339, 1191 (2013)).
PS* This seminar is free and open to the public & no RSVP required.
****All Welcome****
Speaker(s) |
Winthrop Professor Yinong Liu Laboratory for Functional Materials The University of Western Australia
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Location |
Blakers Lecture Room, Ground Floor, Mathematics Building, The University of Western Australia
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Contact |
Askale Abebe
<[email protected]>
: 6488 7565
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URL |
http://mech.uwa.edu.au/
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Start |
Wed, 17 Apr 2013 16:00
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End |
Wed, 17 Apr 2013 17:00
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Submitted by |
Askale Abebe <[email protected]>
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Last Updated |
Thu, 29 Aug 2013 16:04
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