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Full MME Newsletter - Washington State University College of ...

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Research<br />

Researchers Aim for Lighter, Stronger Metals for Your Car<br />

group <strong>of</strong> School <strong>of</strong> Mechanical and Materials Engineering<br />

A researchers has received support for an international<br />

project to improve lightweight metals for use in the transportation<br />

industry.<br />

Working with researchers in Qatar and through<br />

Texas A&M <strong>University</strong>, the researchers, including<br />

Hussein Zbib and David Field, pr<strong>of</strong>essors in<br />

the WSU School <strong>of</strong> Mechanical and Materials<br />

Engineering, have received support from that<br />

nation’s national research foundation to better<br />

understand and improve the behavior <strong>of</strong> highstrength<br />

steel and magnesium.<br />

Leaders in Qatar have invested heavily in<br />

recent years in research and education. Led by<br />

Princess Sheikha Mozah, Qatar established an<br />

Education City to promote research and education,<br />

which includes several U.S. university<br />

branch campuses. Invited to submit a proposal by<br />

WSU alumnus Eyad Masad (’95 MS, ’98 PhD Civil<br />

Engineering), Zbib has been working with Qatarbased,<br />

Texas A&M <strong>University</strong> researchers.<br />

Their first project involved improving magnesium<br />

alloys for automotive applications. Magnesium is very<br />

lightweight, strong, and less dense than other metals,<br />

such as steel and aluminum. It is also the world’s fourth most<br />

abundant element. Magnesium alloys are commonly used in the<br />

manufacturing <strong>of</strong> cell phones, laptops, cameras, and other electronic<br />

components. Increasing its use in automotive applications<br />

could reduce the weight <strong>of</strong> cars by as much 37 percent, dramatically<br />

increasingly their fuel efficiency, says Zbib.<br />

While magnesium is used in some automotive parts, however,<br />

it has significant problems with corrosion. It is brittle and can<br />

crack easily.<br />

The researchers, including Zbib, Field, and doctoral students<br />

Hesam Askari and John Young from WSU, and Ghassan Kridli,<br />

Georges Ayoub, and Ana Rodriguez from Texas A&M-Qatar, focused<br />

on expanding the use <strong>of</strong> magnesium for eventual use in auto body<br />

parts, such as the chassis. By manipulating the microstructure <strong>of</strong><br />

the material, they worked to increase the ability <strong>of</strong> the material<br />

to be formed into complex shapes. In particular, the researchers<br />

looked at the material’s characterization, processing, and forming.<br />

“This work will have significant applications in the auto industry<br />

in the next decade,” says Zbib.<br />

In a separate project, Zbib received support to do research in<br />

advanced high strength steel. As a building material, steel’s important<br />

properties include its strength and ductility, or how much<br />

it can stretch before it breaks. Unfortunately, the two properties<br />

work against each other, so that as a steel alloy gets stronger, its<br />

Multiscale modeling and simulation <strong>of</strong> deformation and strength in advanced high<br />

strength steel shows how clusters <strong>of</strong> nano-precipitates interact with dislocations<br />

(line defects in the crystallographic structure), resulting in increased strength.<br />

ductility decreases. Zbib’s group is increasing both the strength<br />

and ductility <strong>of</strong> steel by manipulating the material’s microstructure<br />

through thermo-mechanical processes.<br />

Zbib is also using multiscale modeling to better understand the<br />

impacts <strong>of</strong> microstructure changes at the macro-scale, which could<br />

lead to better steel design.<br />

Engineering increasingly requires understanding <strong>of</strong> materials<br />

from the nano- to macro-scale. Researchers have to be able to look<br />

at the atomic level <strong>of</strong> materials and know how materials behave in<br />

a full-scale dam or airplane. With the help <strong>of</strong> multiscale modeling<br />

to predict materials’ behavior, researchers and manufacturers can<br />

design a material, rather than using a traditional trial and error<br />

approach.<br />

“We are working to take our understanding <strong>of</strong> the mechanical<br />

properties at the atomic level to help us understand and design for<br />

the macro-scale,” says Zbib. ❚<br />

School <strong>of</strong> Mechanical and Materials Engineering | Spring 2013 5

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