Effects of Process Parameters of Semisolid Stirring on Microstructure of Mg-3Sn-1Mn-3SiC (wt%) Strip Processed by Rheo-rolling

doi:10.1007/s40195-016-0509-8

Abstract

Abstract:

A novel semisolid stirring and rheo-rolling process for preparing Mg-3Sn-1Mn-3SiC (wt%) composite strips was proposed, and the effects of process parameters of semisolid stirring on microstructures of Mg-3Sn-1Mn-3SiC (wt%) composite strips were investigated. The average grain size and roundness decrease, and the distribution of SiC becomes more homogeneous with the decrease in stirring temperature and the increase in the stirring speed. When the stirring time is increased, the distribution of SiC particles tends to be homogeneous, and the average grain diameter and roundness of α-Mg grain decrease. Under the following process parameters: the stirring temperature at 640 °C, the stirring speed at 1100 rpm, the stirring time at 30 min and the roll speed at 0.2 m/s, Mg-3Sn-1Mn-3SiC (wt%) strip with a cross-sectional size of 4 mm × 160 mm was prepared. The ultimate tensile strength and elongation of Mg-3Sn-1Mn-3SiC (wt%) composite strip reached 226 ± 6 MPa and (7.4 ± 0.2)%, which are obviously improved in comparison with Mg-3Sn-1Mn (wt%).

Key words: Mg-matrix composite, Rheo-rolling, Microstructure, Property

Zhan-Yong Zhao,Ren-Guo Guan,Jian-Hong Zhang,Zhou-Yang Zhao,Pei-Kang Bai. Effects of Process Parameters of Semisolid Stirring on Microstructure of Mg-3Sn-1Mn-3SiC (wt%) Strip Processed by Rheo-rolling[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(1): 66-72.

Figures/Tables 11

Fig. 1 Schematic diagram of continuous semisolid rolling

Fig. 2 SEM image a and EDS b from the position Aa of Mg-3Sn-1Mn-3SiC (wt%) composite obtained at stirring temperatures 680 °C (stirring speeds 800 rpm, stirring time 15 min)

Fig. 3 Microstructures of Mg-3Sn-1Mn-3SiC (wt%) composites prepared under different stirring temperatures (stirring speeds 800 rpm, stirring time 15 min): a 680 °C, b 660 °C, c 640 °C

Fig. 4 Average grain diameter and roundness of α-Mg grain obtained at different stirring temperatures

Fig. 5 SEM image and EDS of Mg-3Sn-1Mn-3SiC (wt%) composites under different stirring speeds (stirring time was 15 min, and stirring temperature was 640 °C): a 500 rpm; c 1100 rpm, EDS, b from point Ba EDS, d from point Cc

Fig. 6 Microstructures of Mg-3Sn-1Mn-3SiC (wt%) composites under different stirring speeds (stirring time was 15 min, and stirring temperature was 640 °C): a 500 rpm; b 1100 rpm

Fig. 7 Relationships among the stirring speed and α-Mg grain diameter as well as roundness (stirring time was 15 min, and stirring temperature was 640 °C)

Fig. 8 Microstructures of Mg-3Sn-1Mn-3SiC (wt%) composites under different stirring time (stirring speed at 1100 rpm, stirring temperature at 640 °C): a 5 min, b 30 min

Fig. 9 Relationships among the stirring time and grain diameter as well as roundness

Fig. 10 Mg-3Sn-1Mn-3SiC (wt%) composite strip a and its inner microstructures b

Fig. 11 Engineering stress-strain curve of Mg-3Sn-1Mn-3SiC (wt%) composite strip

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