SERRATED YIELDING OF 5456 ALUMINIUM MAGNE- SIUM ALLOY BASED ON THREE DIMENSIONAL DIGITAL IMAGE CORRELATION

doi:10.11900/0412.1961.2014.00251

Acta Metall Sin

2014, Vol. 50

Issue (12): 1491-1497 DOI: 10.11900/0412.1961.2014.00251

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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.

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Abstract

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.

Key words: 5456 aluminium magnesium alloy three dimensional digital image correlation serrated yielding dynamic strain aging

ZTFLH:

O348.1

Fund: Supported by National Natural Science Foundation of China (Nos.11332010, 51271174 and 11372300) and Fundamental Research Funds for the Central Universities (No.WK2090050029)

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	Yulong CAI
	Shihua FU
	Yuhui WANG
	Chenggang TIAN
	Yue GAO
	Teng CHENG
	Qingchuan ZHANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00251 OR https://www.ams.org.cn/EN/Y2014/V50/I12/1491

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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