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Mater Sci Nanotechnol 2017
Volume 1 Issue 3
Notes:
Magnetic Materials 2017
October 09-10, 2017 London, UK
International Conference on
Ian Baker, Materials Science and Nanotechnology
Processing of
τ
- MnAl
τ
- MnAl has an estimated maximum energy product,
(BH)
max
, of 12 MGOe, which is twice that of AlNiCo
magnets and is composed of much cheaper elements.
On a density-compensated basis (BH)
max
for
τ
- MnAl
is almost two-thirds the value for SmCo magnets. In
this presentation, we will outline various processing
routes that we have used to produce powders of
MnAl including gas atomization, rapid solidification
processing using the Pratt and Whitney RSR process,
and casting followed by pulverization. The resulting
particulates were mechanically milled to produce
nanocrystalline material using a Union Process attritor.
The high temperature
ε
-phase was present both before
and after milling along with significant amounts of
equilibrium
Υ
2
and
β
phases. In addition, ribbons were
produced by melt spinning, which had a similar mix of
ε
,
β
and
Υ
2
phases. We will outline the effects of annealing
on the phases present and the magnetic properties of
the various powders and ribbons. We will also present
the results of the use of back-pressure assisted equal
channel angular extrusion through which the powders
are simultaneously consolidated and transformed to the
τ
phase.
Biography
Ian Baker obtained his BA and D. Phil in Metallurgy and Science of Materials from
the University of Oxford. He is the Sherman Fairchild Professor of Engineering and
Senior Associate Dean at the Thayer School of Engineering, Dartmouth College.
He has published 400 papers and given over 300 presentations at universities,
conferences and in industry, of which 150 were invited. He is a fellow of ASM, TMS,
IOM
3,
MRS and AAAS. He is the editor in Chief of
Materials Characterization
.
Ian.Baker@dartmouth.eduIan Baker
Dartmouth College, USA