SERRATED YIELDING OF 5456 ALUMINIUM MAGNE- SIUM ALLOY BASED ON THREE DIMENSIONAL DIGITAL IMAGE CORRELATION
CAI Yulong1, FU Shihua1, WANG Yuhui1, TIAN Chenggang2, GAO Yue1, CHENG Teng1, ZHANG Qingchuan1()
1 Chinese Academy Sciences Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
Cite this article:
CAI Yulong, FU Shihua, WANG Yuhui, TIAN Chenggang, GAO Yue, CHENG Teng, ZHANG Qingchuan. SERRATED YIELDING OF 5456 ALUMINIUM MAGNE- SIUM ALLOY BASED ON THREE DIMENSIONAL DIGITAL IMAGE CORRELATION. Acta Metall Sin, 2014, 50(12): 1491-1497.
One of the key issues to deeply understand the intrinsic mechanism of Portevin-Le Chatelier (PLC) phenomenon is to analyze the spatial distribution and the evolution of the deformation in PLC bands, associated with serrated yielding. In this work, an investigation was carried out with 5456 aluminium magnesium alloy sheet specimens of different thicknesses at room temperature by using three dimensional digital image correlation (3D-DIC) method, which focused itself on the deformation analysis within serrated yielding under different loading procedures. After statistically analyzing loading curves, it is found that the average amplitude and average period increase with increasing strain. Moreover, there is a positive correlation between the average period and the thickness of specimen, while the average amplitude and the thickness of specimen are independent to some degree. In addition, the experimental result also indicates that the width of the PLC band increases with increasing thickness of the specimen. However, the spatial analysis in PLC bands proves that the angle between the PLC band and the tensile direction is about 60°, which is irrelevant to the specimen thickness and the serration amplitude. Furthermore, it is also found that PLC bands of out-of-plane displacement coincide with bands of strain in the tensile direction by temporal analysis. Most importantly, the experimental result shows that the serration amplitude is proportional to the maximum strain in PLC band when PLC band occurs.
Fund: Supported by National Natural Science Foundation of China (Nos.11332010, 51271174 and 11372300) and Fundamental Research Funds for the Central Universities (No.WK2090050029)
Fig.1 Nominal stress-strain curves for different thickness specimens of 5456 aluminium magnesium alloy
Fig.2 Variations of average amplitude (a) and average period (b) with nominal strains for different thickness specimens of 5456 aluminium magnesium alloy
Fig.3 Serrations and corresponding PLC bands for different thickness specimens of 5456 aluminium magnesium alloy ( εyy —strain field in Y-direction, i.e. strain in tensile direction, dz—full-filed distribution of out-of-plane displacement,i.e. displacement in Z-direction, t—time used for sampling) (a) serrations of about 207 s for different thickness specimens;(b) PLC bands of in-plane deformation corresponding to serrations in Fig.3a;(c) PLC bands of out-of-plane displacement corresponding to serrations in Fig.3a;(d) displacement in Y-direction corresponding to Fig.3b of center line on different thickness specimens;(e) εyy corresponding to Fig.3b of center line on different thickness specimens;(f) dz corresponding to Fig.3c of center line on different thickness specimens
Fig.4 Schematic diagram of calculating PLC angle (a) and the width of PLC bands (b) (θ—acute angle between the PLC band and the tensile direction; the dashed line in Fig.4b represents zero displacement line)
Fig.5 Variations of angles between the PLC band and tensile direction (a) and width of PLC bands (b) with serration amplitude for different thickness specimens of 5456 aluminium magnesium alloy (W1, W2 and W3 represent the width of PLC bands for specimens with 1, 2 and 3 mm thickness, respectively)
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