期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 678, 期 -, 页码 506-510出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.04.035
关键词
Cu-Al alloys; Stacking fault energy; ECAP; Cryogenic temperature; Mechanical properties
资金
- Natural Science Foundation of Jiangsu Province, P. R. China [BK2012594, BK20131144]
- Science Project of Changzhou, P. R. China [CZ20130021]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) [[2014]9]
- Ministry of Education and Science of the Russian Federation [11.2540.2014/K]
Cu-Al alloys with different stacking fault energy (SFE) were processed by equal channel angular pressing and rolling (ECAP _ R) at cryogenic temperature with liquid nitrogen cooling. The effect of SFE on microstructure, effective grain size, dislocation density and tensile properties has been investigated. With decreasing of SFE during cryogenic ECAP, shear bands were developed to be step-shaped by cutting through high density of deformation twins, effective grain size reduces and dislocation density increases. Subsequently imposed to cryorolling, the lamellar thickness of twins and grain size is further reduced. Tensile strength increases with a decrease of SFE, and further enhanced after the additional rolling. The improvement of strength in Cu-Al alloys is attributed to the finer grains/twin thickness and the higher dislocations density. The maximum tensile strength of 871 MPa and uniform elongation of 4.3% in Cue7% Al is simultaneously achieved. (C) 2016 Elsevier B. V. All rights reserved.
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