Effects of Ba Addition on Microstructure and Properties of In-situ Synthesized Mg2Si/Mg-Zn-Si Composite

PDF(1266 KB)

Journal of Materials Engineering ›› 2010, Vol. 0 ›› Issue (4) : 63-68.

Effects of Ba Addition on Microstructure and Properties of In-situ Synthesized Mg₂Si/Mg-Zn-Si Composite

CHEN Ke, LI Zi-quan, LIU Jin-song, YANG Ji-nian, SUN Ying-di, BIAN Song-gang

Author information +

History +

Abstract

Effects of 0.1%-2.0%(mass fraction) Ba addition on the microstructure and tensile properties of Mg₂Si /Mg-Zn-Si composites with high Si content were investigated.The results indicate that,the morphology of primary Mg₂Si in the composites changes from large dendrite to fine polygonal with the increasing Ba content,and its average size sharply decreases until addition of Ba 1.0% and then slowly increases.The average size of eutectic Mg₂Si also shows the same change trend.Numerous tiny BaMg₂Si₂ particles act as the heterogeneous nucleation substrate for primary Mg₂Si.It is also found that BaMg₂Si₂ size in Mg₂Si is obviously coarsened as addition of Ba surpasses 1.0%,which is responsible for over modification.Refined Mg₂Si particles dispersion-strengthen the composite and results in the improvement of ductility.The proper Ba content is a key factor to obtain effectively refined Mg₂Si and enhanced composite.

Key words

Ba addition / Mg₂Si / modification / heterogeneous nucleation

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

CHEN Ke, LI Zi-quan, LIU Jin-song, YANG Ji-nian, SUN Ying-di, BIAN Song-gang. Effects of Ba Addition on Microstructure and Properties of In-situ Synthesized Mg₂Si/Mg-Zn-Si Composite[J]. Journal of Materials Engineering, 2010, 0(4): 63-68

References

[1] LU L,THONG K K,GUPTA M.Mg-based composite reinforced by Mg₂Si[J].Composites Science and Technology,2003,63(5):627-632.
[2] TSUZUKI R,KONDOH K.In-situ solid-state synthesis of Mg composite with Mg₂Si dispersoids[J].Materials Science Forum,2005,475-479(1):497-500.
[3] ASANO K,YONEDA H.In situ formation and refinement of Mg₂Si in fiber-reinforced AZ91D magnesium alloy[J].Materials Transactions,2007,48(6):1469-1475.
[4] THAKUR S K,DIERINGA H,DHINDAW B K,et al.Thermal cycling and creep studies of AM50+Nd magnesium alloy based carbon fiber,SiC particulate and in-situ Mg₂Si reinforced hybrid composites[J].Transactions of the Indian Institute of Metals,2005,58(4):653-659.
[5] LU L,LAI M O,HOE M L.Formation of nanocrystalline Mg₂Si and Mg₂Si dispersion strengthened Mg-Al alloy by mechanical alloying[J].Nanostructured Materials,1998,10(4):551-563.
[6] MORDIKE B L.Development of highly creep resistant magnesium alloys[J].Journal of Materials Processing Technology,2001,117(3):391-394.
[7] PAN Y C,LIU X F,YANG H.Microstructural formation in a hypereutectic Mg-Si alloy[J].Materials Characterization,2005,55(3):241-247.
[8] MABUCHI M,HIGASHI K.Strengthening mechanisms of Mg-Si alloys[J].Acta Metallurgica,1996,44(11):4611-4618.
[9] TSUZUKI R,KONDOH K,DU W B,et al.Effect of extrusion conditions on properties of hot extruded Mg composite with Mg₂Si dispersions via solid-state synthesis[J].Materials Science Forum,2003,419-422(2):789-794.
[10] JIANG Q C,WANG H Y,WANG Y,et al.Modification of Mg₂Si in Mg-Si alloys with yttrium[J].Mater Sci Eng A,2005,392(1-2):130-135.
[11] WANG H Y,JIANG Q C,MA B X,et al.Modification of Mg₂Si in Mg-Si alloys with K₂TiF₆,KBF₄ and KBF₄+K₂TiF₆[J].Journal of Alloys and Compounds,2005,387(1-2):105-108.
[12] GUO E J,MA B X,WANG L P.Modification of Mg₂Si morphology in Mg-Si alloys with Bi[J].Journal of Materials Processing Technology,2008,206(1-3):161-166.
[13] 李金锋,耿浩然,滕新营.Ba对AZ91 镁合金组织和性能的影响[J].热加工工艺,2005,(7):5-7,36
[14] LIAO L H,ZHANG X Q,WANG H W,et al.Influence of Sb on damping capacity and mechanical properties of Mg₂Si/Mg-9Al composite materials[J].Journal of Alloys and Compounds,2007,430(1-2):292-296.
[15] JEON J,LEE S,KIM B,et al.Effect of Sb and Sr addition on corrosion properties of Mg-5Al-2Si alloy[J].Journal of the Korean Institute of Metals and Materials,2008,46(5):304-309.
[16] BRAMFITT B L.The effect of carbide and nitride additions on the heterogenous nucleation behavior of liquid iron[J].Metallurgical Transactions,1970,1(7):197-201.