Effect of Minor Sc on Microstructure and Properties of Al-Zn-Mg Alloy Weld Joint

doi:10.11901/1005.3093.2019.064

Chinese Journal of Materials Research

2019, Vol. 33

Issue (9): 673-682 DOI: 10.11901/1005.3093.2019.064

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Effect of Minor Sc on Microstructure and Properties of Al-Zn-Mg Alloy Weld Joint

LI Zhaoming^1,²,JIANG Haichang¹(

),YAN Desheng¹,ZHANG Hongliang²,RONG Lijian¹,WU Fei

1. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China
3. Dalian Starts Co. Ltd. , Dalian 116023, China

Cite this article:

LI Zhaoming,JIANG Haichang,YAN Desheng,ZHANG Hongliang,RONG Lijian,WU Fei. Effect of Minor Sc on Microstructure and Properties of Al-Zn-Mg Alloy Weld Joint. Chinese Journal of Materials Research, 2019, 33(9): 673-682.

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Abstract

The microstructures, tensile properties and stress corrosion cracking resistance of tungsten inert gas weld joints of Al-Zn-Mg alloy and Al-Zn-Mg alloy with 0.06% (mass fraction) Sc were comparatively investigated by means of optical microscope, scanning electron microscope, transmission electron microscopy, electronic universal testing machine and slow strain rate test. The results show that recrystallization with abnormal grain growth occurred in heat affected zone near the fusion line of the traditional Al-Zn-Mg alloy, while the excellent thermal stability of secondary Al₃(Sc, Zr, Ti) phase existed in the Al-Zn-Mg alloy with 0.06% Sc, which could hinder the grain boundary migration during the welding process, thereby inhibit the nucleation and growth of recrystallized grains and then refine the grain size in the matrix near the fusion line. At the same time, the strength of the weld joint for Al-Zn-Mg alloy with 0.06% Sc is obviously higher than that for Al-Zn-Mg alloy, which is mainly related to the grain-boundary strengthening and dispersion strengthening caused by secondary Al₃(Sc, Zr, Ti) phase.

Key words: metallic materials Al-Zn-Mg alloy Sc addition Al₃(Sc Zr Ti) phase recrystallization tungsten inert gas welding

Received: 16 January 2019

ZTFLH:

TG146

Fund: National Key Research and Development Program of China(2016YFB1200501);Strategic Priority Program of the Chinese Academy of Sciences(XDB22020200);Natural Science Foundation of Liaoning Province(20170540688)

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	Zhaoming LI
	Haichang JIANG
	Desheng YAN
	Hongliang ZHANG
	Lijian RONG
	Fei WU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.064 OR https://www.cjmr.org/EN/Y2019/V33/I9/673

Table 1 Composition of ER5356 welding wire (mass fraction, %)

Fig.1 Optical microstructures of Al-Zn-Mg-(Sc) plate edge, (a) 0.00Sc, (b) 0.06Sc

Fig.2 TEM images and SAD patterns of Al-Zn-Mg-(Sc) plate edge (a, c) 0.00Sc, (b, d) 0.06Sc

Table 2 Room-temperature tensile properties of Al-Zn-Mg-(Sc) plates

Fig.3 Tensile fracture morphologies of Al-Zn-Mg-(Sc) plates, (a) 0.00Sc, (b) 0.06Sc

Fig.4 Weld appearance (a) 0.00Sc, (b) 0.06Sc and X-ray radiography images (c) 0.00Sc, (d) 0.06Sc for the welding joints of Al-Zn-Mg-(Sc) alloys

Fig.5 Optical microstructure of WZ (a) 0.00Sc, (b) 0.06Sc and WZ-HAZ transition zone (c) 0.00Sc, (d) 0.06Sc in welding joints of Al-Zn-Mg-(Sc) plates

Fig.6 TEM images and SAD patterns of WZ (a) 0.00Sc, (b) 0.00Sc and HAZ (c, e) 0.00Sc, (d, f) 0.06Sc in the welding joints of Al-Zn-Mg-(Sc) plates

Table 3 Tensile properties of welding joints of Al-Zn-Mg-(Sc) plates

Fig.7 Photos of tensile fractured locations of the welding joints for Al-Zn-Mg-(Sc) plates, (a) on the front surface, (b) on the side surface

Fig.8 Morphologies of WZ (a) 0.00Sc, (b) 0.06Sc and HAZ (c) 0.00Sc, (d) 0.06Sc on tensile fracture surface of the welding joints of Al-Zn-Mg-(Sc) alloys

Fig.9 Typical stain-stress curves of TIG weld joints of Al-Zn-Mg-(Sc) alloys tested in air and in neutral 3.5% NaCl solution

Fig.10 Fracture surfaces of TIG weld joints of Al-Zn-Mg-(Sc) alloys failed in air (a) 0.00Sc, (b) 0.06Sc and in 3.5% NaCl solution (c) 0.11Sc, (d) 0.23Sc

Fig.11 Mass fraction of precipitates in Al-Zn-Mg-(Sc) alloys as a function of temperature (a) 0.00Sc, (b) 0.06Sc

Fig.12 Cross-sectional structure of welding joints of Al-Zn-Mg-(Sc) alloys, (a) 0.00Sc, (b) 0.06Sc

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