Process and Mechanism of Novel Heat Treatment for Controlling Residual Stress in Al-Cu-Mg Alloy

doi:10.11901/1005.3093.2018.626

Chinese Journal of Materials Research

2019, Vol. 33

Issue (6): 435-442 DOI: 10.11901/1005.3093.2018.626

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Process and Mechanism of Novel Heat Treatment for Controlling Residual Stress in Al-Cu-Mg Alloy

Wenjing MA¹,Zhiguo CHEN^1,²(

),Hongjuan LI²,Zhengui YUAN¹,Ziqiao ZHENG²(

)

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China
2. Department of Materials Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China

Cite this article:

Wenjing MA,Zhiguo CHEN,Hongjuan LI,Zhengui YUAN,Ziqiao ZHENG. Process and Mechanism of Novel Heat Treatment for Controlling Residual Stress in Al-Cu-Mg Alloy. Chinese Journal of Materials Research, 2019, 33(6): 435-442.

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Abstract

The influence of a novel heat treatment process for reducing residual stress on the microstructure evolution and mechanical properties of Al-Cu-Mg alloy was investigated by means of transmission electron microscope, scanning electron microscope, X-ray diffractometer and tensile test. The results show that the residual stress reduction rate of Al-Cu-Mg alloy (compared with the solid solution treated one) reaches 92.7% by the novel heat treatment, while an excellent combination of strength and plasticity was acquired. As a result, the yield strength, ultimate tensile strength and the elongation rate of the alloy can reach 463.6 MPa, 502.5 MPa and 12.7% respectively. TEM observations reveal that the S′ precipitates are fine and uniformly distributed in the microstructure after the novel heat treatment. The synergistic effect of the coherency stress field produced by these S' phases and the quenching residual stress field may result in a significant reduction of the residual stress, which gives rise to the high comprehensive properties of Al-Cu-Mg alloy.

Key words: metallic materials Al-Cu-Mg novel heat treatment residual stresses mechanical properties microstructure

Received: 23 October 2018

ZTFLH:

TG146.2

Fund: National Natural Science Foundation of China(No. 51011120052)

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	Wenjing MA
	Zhiguo CHEN
	Hongjuan LI
	Zhengui YUAN
	Ziqiao ZHENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.626 OR https://www.cjmr.org/EN/Y2019/V33/I6/435

Table 1 Chemical composition of alloy (%, mass fraction)

Table 2 Process parameters of the heat treatment

Fig.1 Schematic presentation of the novel heat treatment

Fig.2 Residual stresses of alloy under different conditions

Fig.3 Relative reduction in residual stresses compared to solution treated sample

Table 3 Tensile mechanical properties of alloy under different conditions

Fig.4 XRD patterns of alloy under different conditions (A) T8(3%); (B) PU(3/150);(C)PU(3/200)

Table 4 Relative diffraction peak intensity of alloy under different conditions

Fig.5 Fracture morphoiogies of alloy for tensile test (a) PU(1.5/200); (b) PU(3/150); (c) T6 peak aging; (d) T8(3%) and EDS spectra of second phase (e) of PU(3/150) alloy

Fig.6 TEM images of alloy with corresponding diffraction patterns under different heat treatment conditions (a) T6 peak aging; (b) T8(3%); (c) PU(3/150); (d) PU(3/200)

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