Effect of Cu Content on Anisotropy of Mechanical Property of Al-Cu-Mn Alloy

doi:10.11901/1005.3093.2017.766

Chinese Journal of Materials Research

2018, Vol. 32

Issue (11): 853-860 DOI: 10.11901/1005.3093.2017.766

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Effect of Cu Content on Anisotropy of Mechanical Property of Al-Cu-Mn Alloy

Fang YU^1,³, Daofen XU^2,^3,⁴, Songyi CHEN^2,³, Kanghua CHEN^1,^2,³(

), Xifeng WANG^1,³, Debo LIU⁵, Yunlong MA⁵, Cheng HUANG⁵, Dongyang YAN⁵

1 Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
2 Light Alloy Research Institute, Central South University, Changsha 410083, China
3 Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China
4 Guilin University of Aerospace Technology, Guilin 541104, China
5 Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China

Cite this article:

Fang YU, Daofen XU, Songyi CHEN, Kanghua CHEN, Xifeng WANG, Debo LIU, Yunlong MA, Cheng HUANG, Dongyang YAN. Effect of Cu Content on Anisotropy of Mechanical Property of Al-Cu-Mn Alloy. Chinese Journal of Materials Research, 2018, 32(11): 853-860.

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Abstract

The effect of Cu-content on microstructure and fracture behavior of Al-Cu-Mn alloy was investigated by tensile test, optical microscope (OM) and scanning electron microscope (SEM). The results show that with the decrease of Cu-content from 6.51% to 5.41% (in mass fraction) the quantity and size of the coarse Al₂Cu phase in the alloy is reduced, the elongation of the alloy increases and thus the anisotropy of the alloy is decreased. The main mechanism is that for the alloy with relatively high Cu-content, the formed micron Al₂Cu phase causes stress concentration, which induces preferentially breakage of Al₂Cu phase and then the formed cracks are interconnected. However, for the alloy with lower Cu-content, the cracks do not expand and connect with each other after the breakage of Al₂Cu phase, while fracture may expand along grain boundaries. The difference in orientation distribution of micron phases of Al₂Cu in the matrix of alloy may be the main reason for the anisotropy of mechanical properties.

Key words: metallic materials Al-Cu-Mn alloy Cu contents anisotropy

Received: 27 December 2017

ZTFLH:

TG146

Fund: Supported by National Natural Science Foundation of China (No. U1637601), Transformation of Scientific and Technological Achievements Program of Jiangsu Province (No. BA2015075), National Key Research and Development Program of China (No. 2016YFB0300801), Major Research Equipment Development Projects of National Natural Science Foundation of China (No. 51327902)

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	Articles by authors
	Fang YU
	Daofen XU
	Songyi CHEN
	Kanghua CHEN
	Xifeng WANG
	Debo LIU
	Yunlong MA
	Cheng HUANG
	Dongyang YAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.766 OR https://www.cjmr.org/EN/Y2018/V32/I11/853

Table 1 Chemical compositionof Al-Cu-Mn aluminum alloy (mass fraction, %)

Fig.1 Sampling direction of the test specimen

Table 2 Tensile mechanical properties and the IPA index of the alloy

Fig.2 The microstructure of Al-Cu-Mn aluminum alloy with different Cu cotents (a) L-S; (b) T-S; (1) 6.51Cu; (2) 6.22Cu; (3) 5.87Cu; (4) 5.41Cu

Table 3 Count, average size and area fraction of Al₂Cu phase in the alloy

Fig.3 SEM fractographs of tensile fracture of Al-Cu-Mn aluminum alloy with different Cu cotents (a) L;(b) T; (1) 6.51 Cu; (2) 6.22 Cu; (3) 5.87 Cu; (4) 5.41 Cu

Fig.4 EDS analysis of fracture in the alloy

Fig.5 Images of the thickness direction after tensile in L/T direction (a) L, (b) T; (1) 6.51Cu; (2) 5.41Cu

Fig.6 Calculated isothermal (at 541℃) section phase diagram of Al-Cu-Mn system (Zr=0.13%)

Fig.7 Images and EDS analysis of residual second phase in the alloy

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