Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (8): 2263-2271.doi: 10.13229/j.cnki.jdxbgxb.20201097

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Effect of friction stir processing parameters on the surface modification layer of magnesium alloy

Xian-yong ZHU1,2(),Liang-wen XIE1,Yue-xiang FAN1,Cheng JIANG1,Wei-jia SUN1,Peng WANG1,Xiong XIAO1   

  1. 1.School of Mechanical and Aerospace Engineering，Jilin University，Changchun 130022，China
    2.Chongqing Research Institute，Jilin University，Chongqing 401120，China
  • Received:2020-09-11 Online:2023-08-01 Published:2023-08-21

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Abstract:

In order to improve the microstructure and mechanical properties on surface of magnesium alloys， the surface modification of Mg-3.4Al-0.8Zn-0.4Sn magnesium alloy was carried out by friction stir processing. By using a pin-less tool， setting a series of travel speeds and rotation speeds， analyzing the thermal cycle process， observing the macroscopic morphology of the surface modification zone， characterizing microstructure and measuring microhardness， the influence of process parameters on the surface modification layer was studied. The results show that， the surface modification zone can be divided into four layers including stir layer， rotation flow layer， transition layer and themo-mechanical affected layer. As the travel speed increases， the time and the peak temperature of the thermal cycle， the thickness of the surface modification layer and the average grain size decrease， while the microhardness increases. By contrast， as the rotation speed increases， the peak temperature of the thermal cycle， the thickness of the surface modification layer and the average grain size increase， while the microhardness decreases. The modification layer obtained at each parameter showed significant grain refinement and microhardness increment compared to the base material.

Key words: materials synthesis and processing technology, magnesium alloy, friction stir processing, surface modification

CLC Number: 

  • TG178

Fig.1

Friction stir processing equipment and tool"

Fig.2

Schematic diagram of temperature measuring device"

Fig.3

Thermal cycle curves under different friction stir processing parameters"

Fig.4

Morphology of the modified surface under different process parameters"

Fig.5

Macrostructure of the modification surface at cross-section under different process parameters"

Fig.6

Fitting curve of surface modified layer thickness as a function of the process parameters"

Fig.7

Schematic diagram of the structure division and optical mirror images of various zones of the surface modification layer under process parameters of 20 mm/min and 1500 r/min"

Fig.8

Grain size distribution of various layers under the process parameters of 20 mm/min and 1500 r/min"

Fig.9

Microstructure of the transition zone of the surface modification layer under different process parameters"

Fig.10

Variation curves of average grain size of various layers with process parameters"

Fig.11

Variation curves of microhardness of various layers with process parameters"

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