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Anomalous deformation behavior of thermally stable nanocrystalline immiscible alloys

October 13, 2017 @ 11:00 am - 12:00 pm

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Speaker: Prof. Kiran Solanki (ASU)

Host: Professor Yuntian Zhu

Abstract

The immiscible nanocrystalline Cu-Ta produced by cryogenic mechanical alloying demonstrate
an extraordinary high-temperature stability of the microstructure and a high strength under both
tension and compression. This talk highlights the stabilization and mechanical properties of the
nanocrystalline Cu-Ta family of alloys, which in many cases demonstrate divergent behaviors,
wherein the inferred long-established mechanisms governing no longer apply. For instance,
contrary to the conventional believe and hitherto, we discover that a truly stabilized
nanocrystalline material will not exhibit inverse Hall–Petch strengthening or superplastic
behavior even when subjected to temperature as high as 80% of its melting point. Many of the
unusually properties of such alloys are due to the precipitation of nanometer-scale Ta based
clusters coherent with the Cu matrix. These clusters impose strong resistance to dislocation glide,
pin grain boundaries in place, and effectively block grain boundary motion and grain rotation.
Finally, this talk will also review the recent progress made through experimental studies and
atomistic computer simulations aimed to understand other remarkable properties of the fully
stabilized nanocrystalline material, including the unusually small strain rate sensitivity (in
dynamic regime), the limited strain hardening and extraordinary creep behavior.

Bio
Dr. K. N. Solanki is an Associate Professor and an Exemplar faculty in the School of
Engineering of Matter, Transport and Energy at Arizona State University. Prior to coming to
ASU, he was an Associate Director for the Center for Advanced Vehicular Systems at
Mississippi State University. Dr. Solanki received his Ph.D. from Mississippi State University in
December 2008. Dr. Solanki’s research interest is at the interface of solid mechanics and
materials science, with a focus on characterizing and developing microstructure-based
structure–property relationships across multiple length and time scales. To date, he has
coauthored >70 journal articles, four book chapters, and >35 conference proceedings with
faculty and students at ASU and MSU. For his efforts to promote the education of engineering
students in the area of fatigue technology, he was awarded the SAE Henry O. Fuch Award by the
SAE Fatigue Design & Evaluation Committee. In 2011, Dr. Solanki received TMS Light Metals
Magnesium Best Fundamental Research Paper Award for his work on predicting deformation
and failure behavior in magnesium alloys using a multiscale modeling approach. Recently, he
received the 2013 TMS Light Metals Division Young Leader Professional Development Award,
the 2013 Air Force Office of Scientific Research Young Investigator Research Award, the 2013
ASME “Orr Award” for Early Career Excellence in Fatigue, Fracture, and Creep, and the 2016
Science awards from the ONR/ECI.

 

Details

Date:
October 13, 2017
Time:
11:00 am - 12:00 pm
Event Categories:
,

Organizer

MSE Department
Phone:
919.515.2377
Website:
https://www.mse.ncsu.edu

Venue

EB1 – Room 1011
911 Partners Way
Raleigh, NC 27695-7907 United States
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