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Grain refinement and properties of ultrafine-grained AI, Mg and Ti alloys produced by equal-channel angular pressing with back-pressure


Severe plastic deformation (SPO) techniques have been widely evaluated for the production of materiais with ultrafine microstructure with grains. Among these procedures, ECAP is an especially attractive one and quite a number of recent scientific and engineering publications are devoted to studying considerable plastic strain, in particular, the strain created by equal channel angular pressing (ECAP). The number of such works continues to grow, which is explainable in the first turn by the relative simplicity of the ECAP process and by the possibility of obtaining exceptionally fine grains of submicron size. This results in considerable improvement of the mechanical properties of the alloys. However, applications of ECAP can be restricted during processing of hard-to-deforrn and low-ductility materiais. It is known that in order to effectively refine the structure and achieve superior properties ECAP should be realized in several cycles. The high levei of accumulated strain can result in crack initiation and failure of samples, which is connected with non-conformance of ductility and the levei of specific pressures holding back the sample failure. The deformation capacity of the material improves at elevated temperatures. However, the recovery processes and microstructure recrystallization makes it difficull to achieve lhe maximum degree of refinement and extraordinary properties. One of the effective ways to enhance the deformability resource durin ECAP is to increase the hydrostatic pressure. (AU)

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Scientific publications (7)
(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)
ALEXANDER P. ZHILYAEV; TERENCE G. LANGDON. Microhardness and EBSD microstructure mapping in partially-pressed al and cu through 90º ECAP die. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 16, n. 3, p. 586-591, . (11/51245-8)
JORGE, JR., ALBERTO MOREIRA; DE LIMA, GISELE FERREIRA; MARTINS TRIQUES, MARIA REGINA; BOTTA, WALTER JOSE; KIMINAMI, CLAUDIO SHYINTI; NOGUEIRA, RICARDO PEREIRA; YAVARI, ALAIN REZA; LANGDON, TERENCE G.. Correlation between hydrogen storage properties and textures induced in magnesium through ECAP and cold rolling. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 39, n. 8, p. 3810-3821, . (11/51245-8)
JORGE, JR., ALBERTO MOREIRA; PROKOFIEV, EGOR; DE LIMA, GISELE FERREIRA; RAUCH, EDGAR; VERON, MURIEL; BOTTA, WALTER JOSE; KAWASAKI, MEGUMI; LANGDON, TERENCE G.. An investigation of hydrogen storage in a magnesium-based alloy processed by equal-channel angular pressing. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 38, n. 20, p. 8306-8312, . (11/51245-8)
KAWASAKI, MEGUMI; LANGDON, TERENCE G.. Evaluating the Flow Processes in Ultrafine-grained Materials at Elevated Temperatures. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 16, n. 3, p. 565-570, . (11/51245-8)
MEGUMI KAWASAKI; TERENCE G. LANGDON. Evaluating the flow processes in ultrafine-grained materials at elevated temperatures. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 16, n. 3, p. 565-570, . (11/51245-8)
YI HUANG; ROBERTO B. FIGUEIREDO; THIERRY BAUDIN; ANNE-LAURE HELBERT; FRANÇOIS BRISSET; TERENCE G. LANGDON. Microstructure and texture evolution in a magnesium alloy during processing by high-pressure torsion. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 16, n. 3, p. 577-585, . (11/51245-8)
JORGE, JR., ALBERTO MOREIRA; PROLZOFIEV, EGOR; MARTINS TRIQUES, MARIA REGINA; ROCHE, VIRGINIE; BOTTA, WALTER JOSE; KIMINAMI, CLAUDIO SHYINTI; RAAB, GEORGY I.; VALIEV, RUSLAN Z.; LANGDON, TERENCE G.. Effect of cold rolling on the structure and hydrogen properties of AZ91. and AM6OD magnesium alloys processed by ECAP. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 42, n. 34, p. 21822-21831, . (10/11477-4, 13/05987-8, 12/13179-6, 11/51245-8)

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