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Properties of amorphous, metastable and nano-structured metallic alloys

Grant number: 05/59594-0
Support Opportunities:Research Projects - Thematic Grants
Duration: November 01, 2006 - October 31, 2011
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Walter José Botta Filho
Grantee:Walter José Botta Filho
Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
Pesquisadores principais:
Claudemiro Bolfarini ; Claudio Shyinti Kiminami
Associated grant(s):10/07035-6 - Mechanical properties of metallic glasses, AV.EXT
09/05939-8 - 16th International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM 2009), AR.EXT
Associated scholarship(s):11/19495-4 - Microstructural characterization of nanostructured steels, BP.IC
11/21135-6 - Production of amorphous alloys and bulk metallic glasses for special apllications, BP.IC
11/02073-0 - Microstructural Characterization of Easy Glass Formers Fe-Nb-B-Y alloys., BP.IC
+ associated scholarships 11/05885-5 - Mechanical properties of recycled aerospace aluminium alloys processed by spray forming, BP.IC
11/06497-9 - Production and mechanical characterization of Al alloys containing quasicrystalline phases, BP.IC
11/01359-7 - Microstructural characterization of amorphous and nanocrystalline alloys of Ti-Nb-Fe-Sn system, BP.IC
10/18766-1 - Deformation induced crystallization in glassy alloys form the Cu-Zr-Al and Cu-Zr-Ti systems, BP.IC
10/01375-0 - Magnesium based amorphous alloys for application as temporary biomaterial, BP.IC
10/01434-6 - Severe Plastic Deformation in Ti Alloys for Biomedical Applications, BP.IC
10/05856-2 - Processing and Characterization of bulk amorphous alloys from Cu-Zr-Al system, BP.IC
09/04210-4 - Synthesis of Mg2FeH6 containing transition metals and transition metals fluorides as additives, BP.IC
09/04217-9 - Synthesis and consolidation by severe plastic deformation of MgH2 and Mg2FeH6 nanocomposite containing different types of catalysts, BP.IC
08/09643-3 - Mg2FeH6-based nanocomposites for hydrogen storage, BP.PD
09/00568-1 - Glass forming ability of Fe(Co)TiZr alloys, BP.IC
08/08431-2 - Development of amorphous alloys in the Al-Ni-Sm system, BP.IC
08/07687-3 - Mechano-chemical synthesis, microstructural characterization and evaluation of storage properties of nanostructures complex hydrates, BP.MS
08/06933-0 - High torsion pressure to consolidate alloys for hydrogen storage., BP.IC
08/06934-7 - Topological instability and selection of glassy alloys from the systems Cu-Zr-Al and Cu-Zr-Ti, BP.IC


Metallic alloys with microstructures containing amorphous, metastable and nanostructure phases represent a new class of materials with surprising properties, which result both from intrinsic characteristics of the structure and from the presence and combination of phases produced by the compositions and by the different types of non-equilibrium processing techniques. The amorphous metallic alloys present excellent values of mechanical properties, however, acceptable ductility levels are observed only in alloys containing a small volume fraction of nanometric crystalline and/or metastable phases. In the nano-structured alloys, the mechanical properties are determined by the dimensions of the nanometric phases and by the presence of metastable phases, for example, quasicrystalline phases. Non-equilibrium processing of conventional alloys, such as very high cooling rates from the melt or high energy ball milling of solid phases, may result in the suppression of undesirable phases substituted by less-deleterious metastable phases. In particulate nanocomposites the large area fraction of interfaces can modify completely the kinetics of reactions and/or transformations, with important consequences in several physical and chemical properties. In this context, the objective of this project is the detailed evaluation and optimization of mechanical properties of metallic alloys containing amorphous, metastable and nano-structured phases as a function of the micro structural characteristics of each system, and the properties of hydrogen absorption/desorption in nanostructure composites as a function of the presence of different catalysts. The amorphous metallic alloys of interest in our project are the bulk alloys, that is, with large glass forming ability, of several systems such as Cu-based, CuZr-based, Fe-based, Ni-based, NiNb-based and Ti-based and the main objective is the development and control of the micro- (nano) -structures that result in alloys with high mechanical strength and ductility. The nanostructure metallic alloys are Al-based containing several types of nano-dispersions, including the nano-quasicrystalline phases and we will be focusing on the optimization of the nanostructures to improve the thermal stability and mechanical properties. The conventional alloys of our interest are also Al-based, mainly AI-Si, which are important recycling alloys, and we will evaluate the processing conditions for selected suppression of deleterious fragile phases. The nanocomposites for hydrogen storage are based in Mg, Mg-Ni and Ti-Cr-V and we have as specific objective understanding the effect of catalysts and surface protecting layers on the decreasing temperature and increasing kinetics of hydrogen absorption/desorption of selected hydrides. Processing techniques for the production of non-equilibrium microstructures include rapid solidification, via melt-spinning, cooled metal mould casting, centrifuge casting, atomization (in this case, followed by warm-extrusion) or spray forming, and conventional and reactive high energy ball milling. The calorimetric and micro structural characterization are important aspects of this project since the mechanical properties and the properties of hydrogen absorption/desorption depend fundamentally on the presence, distribution and stability of the metastable and nanometric phases. As scientific result of our project we must contribute to the understanding of: 1) the ductilisation conditions of the amorphous metallic alloys containing dispersion of nanometric phases; 2) the thermodynamic conditions for the control and/or suppression of certain phases in the nano-structured alloys and 3) the fundamental mechanisms for the catalyses by the presence of nano-particles in nanocomposites for hydrogen storage. Finally, with our focus in the detailed study of properties, our project must also contribute to a careful evaluation of possible applications for the metallic alloys containing amorphous, metastable and nano-structured phases. (AU)

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Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ASSELLI, A. A. C.; LEIVA, D. R.; HUOT, J.; KAWASAKI, M.; LANGDON, T. G.; BOTTA, W. J.. Effects of equal-channel angular pressing and accumulative roll-bonding on hydrogen storage properties of a commercial ZK60 magnesium alloy. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 40, n. 47, p. 6-pg., . (05/59594-0)
KOGA, GUILHERME YUUKI; BOLFARINI, CLAUDEMIRO; KIMINAMI, CLAUDIO SHYINTI; JORGE, ALBERTO MOREIRA, JR.; BOTTA, WALTER JOSE. An Overview of Thermally Sprayed Fe-Cr-Nb-B Metallic Glass Coatings: From the Alloy Development to the Coating's Performance Against Corrosion and Wear. JOURNAL OF THERMAL SPRAY TECHNOLOGY, v. 31, n. 4, p. 33-pg., . (13/05987-8, 12/10631-5, 05/59594-0, 17/09237-4)
MEDEIROS, B. B.; MEDEIROS, M. M.; FORNELL, J.; SORT, J.; BARO, M. D.; JORGE JUNIOR, A. M.. Nanoindentation response of Cu-Ti based metallic glasses: Comparison between as-cast, relaxed and devitrified states. Journal of Non-Crystalline Solids, v. 425, p. 103-109, . (05/59594-0)
KOGA, G. Y.; NOGUEIRA, R. P.; ROCHE, V.; YAVARI, A. R.; MELLE, A. K.; GALLEGO, J.; BOLFARINI, C.; KIMINAMI, C. S.; BOTTA, W. J.. Corrosion properties of Fe-Cr-Nb-B amorphous alloys and coatings. SURFACE & COATINGS TECHNOLOGY, v. 254, p. 238-243, . (05/59594-0)
ASSELLI, A. A. C.; LEIVA, D. R.; HUOT, J.; KAWASAKI, M.; LANGDON, T. G.; BOTTA, W. J.. Effects of equal-channel angular pressing and accumulative roll-bonding on hydrogen storage properties of a commercial ZK60 magnesium alloy. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 40, n. 47, SI, p. 16971-16976, . (05/59594-0)

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