期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 600, 期 -, 页码 29-33出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.02.059
关键词
Al-Mg-Si alloy; Precipitate-dislocation interaction mechanism; Transmission electron microscopy; Electron tomography
Interaction between precipitates and dislocations is the most important factor governing mechanical properties of precipitation-hardening alloys. Thus large numbers of microstructural characterizations have been implemented to analyze this interaction by measuring critical angles and precipitate intervals. To date, these investigations have been performed using two-dimensional conventional transmission electron microscopy. In this study, a combination of transmission electron microscopy and computed tomography, three-dimensional electron tomography, was applied on balanced Al-Mg-Si alloy to measure critical angles and precipitate intervals and obtained 121 degrees and 60 nm for beta '' precipitates, respectively. The yield stress of precipitates measured by assigning these values, 150 MPa, was applicable to that measured from tensile test, 196 MPa. (C) 2014 Elsevier B. V. All rights reserved.
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