Prepration and Mechanical Properties of Ultrafine-grained 6061 Al-alloy by Friction Stir Process

doi:10.11901/1005.3093.2021.159

Chinese Journal of Materials Research

2021, Vol. 35

Issue (5): 321-329 DOI: 10.11901/1005.3093.2021.159

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Prepration and Mechanical Properties of Ultrafine-grained 6061 Al-alloy by Friction Stir Process

WANG Beibei¹^,², LIU Yandong¹, XUE Peng²(

), NI Dingrui², XIAO Bolv², MA Zongyi²

^1.School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

WANG Beibei, LIU Yandong, XUE Peng, NI Dingrui, XIAO Bolv, MA Zongyi. Prepration and Mechanical Properties of Ultrafine-grained 6061 Al-alloy by Friction Stir Process. Chinese Journal of Materials Research, 2021, 35(5): 321-329.

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Abstract

6061 Al-alloy plates were prepared by friction stir process (FSP) with conventional air cooling and additional water cooling, and the microstructure and mechanical properties of the FSP 6061 Al-alloys were investigated. Results show that the processed zone was characterized as equiaxed uniform ultrafine-grained (UFG) microstructure with low dislocation density and high fraction of high angle grain boundaries (>70%), and the average grain size was refined to 200 nm in the condition of additional water cooling. Spherical and rod-like precipitates were observed in the FSP 6061 Al-alloy. The applying of additional water cooling suppressed the growth of precipitates, led to the solid solution of some elements in the matrix, and reduction of precipitate size and space. The FSP 6061 Al-alloy prepared with additional water cooling exhibited higher effect of grain boundary strengthening and precipitation strengthening, resulting in a high ultimate tensile strength of 505 MPa, which was 55% higher than that of the 6061 Al-alloy of peak aging state.

Key words: metallic materials ultrafine grain material friction stir processing mechanical properties strengthening mechanism

Received: 02 March 2021

ZTFLH:

TG146

Fund: National Natural Science Foundation of China (Nos. 52071317 ＆ U1760201) and Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017236)

About author: XUE Peng, Tel: (024)23971752, E-mail: pxue@imr.ac.cn

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	Beibei WANG
	Yandong LIU
	Peng XUE
	Dingrui NI
	Bolv XIAO
	Zongyi MA

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.159 OR https://www.cjmr.org/EN/Y2021/V35/I5/321

Table 1 Chemical compositions of 6061 Al-T6 sheets (mass fraction/%)

Fig.1 Schematic illustration of FSP and the sample locations for tensile tests and microstructure observations

Fig.2 Cross-sectional macrostructure of FSP 6061 Al (a) A-300, (b) W-300

Fig.3 EBSD maps of A-300 (a), W-300 (b), and distribution of grain boundary misorientation angles of A-300 (c), W-300 (d)

Fig.4 Typical TEM microstructure of base material and FSP 6061 Al (a) base material, (b) HRTEM of precipitation in base material, (c) A-300, (d) W-300

Fig.5 Magnified TEM image of W-300 sample

Fig.6 Tensile engineering stress-strain curves (a) and work hardening rate (b) of base material and FSP 6061 Al

Fig.7 Tensile fractographies (a) A-300, (b) magnified graph of A-300, (c) W-300, (d) magnified graph of W-200

Fig.8 Ultimate tensile strength of 6xxx Al alloy prepared by different methods^[27~33]

Fig.9 Various strengthening mechanisms contributed to the yield strengths of A-300 and W-300 samples

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