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Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21
st
International Conference on
Advanced Materials & Nanotechnology
Competitive crystallization in Al-Sm involving metastable large-unit-cell intermetallic phases:
chemical partitioning and crystal genes
R E Napolitano
1
, F Meng
2
, R T Ott
2
, S H Zhou
2
and
W Wang
2
1
Iowa State University, USA
2
Ames Laboratory, USA
A
morphous alloys of Al-Sm exhibit competitive devitrification behavior upon reheating, involving competition between
multiple metastable phases. These include large-unit-cell phases with cubic, hexagonal and tetragonal symmetry, along
with more conventional stable and metastable compounds. Phase selection during crystallization is strongly path dependent,
owing to effects of non-crystalline ordering and the role of diffusion and chemical partitioning in the morphological dynamics.
In this work, devitrification kinetics is investigated and quantified using high energy X-ray diffraction, thermal analysis and
electron microscopy. Measurements are related to system thermodynamics in the highly driven regime highlighting principles
of selection. Growth mechanisms are investigated in detail, with particular attention to chemical partitioning associated with
the initial crystallization front. Implications with respect to other Al-RE (rare-earth) systems are also discussed.
ren1@iastate.eduRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021