Ca含量对Mg-8Sn合金组织与力学性能的影响
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摘要
利用金相显微镜(OM)、X射线衍射分析(XRD)、扫描电子显微镜(SEM)等手段观察分析了铸态Mg-8Sn-xCa合金组织,并且通过显微硬度及压缩强度等性能,研究Ca含量对Mg-8Sn合金力学性能的影响。研究发现,Ca的添加使得Mg-8Sn合金组织中形成明显的棒状及针状CaMgSn相,随着Ca含量的增加,CaMgSn相尺寸明显变大,并且其有效细化了基体的晶粒尺寸。Ca含量的添加使得合金强度明显提高,但使合金塑性降低;Mg-8Sn-1Ca合金在强度明显提高的同时,保持了较好的塑性;当Ca含量大于1%时,合金强化效果减弱,材料塑性下降明显。
The microstructure of Mg-8Sn-xCa alloys was studied by optical microscope(OM),X-ray diffraction and scanning electron microscope(SEM)in this paper.And the effects of Ca content on the micro-hardness and compressive properties of Mg-8Sn alloy were investigated.The results show that the rod-like and needle-like CaMgSn phase formed in Mg-8Sn alloy with Ca addition.The size of CaMgSn laths increased with the increase of Ca content.Meanwhile,Ca addition refined the grain size.The addition of Ca improves the strength of Mg-8Sn alloy and decrease the elastic of Mg-8Sn alloy.However,when the Ca content reached to 1%,the continue increase of Ca content created a weak effect on the strength improvement and obviously reduced the elastic of Mg-Sn alloy.Mg-8Sn-1Ca alloy obtained an improved strength with a preferable elastic.
The microstructure of Mg-8Sn-xCa alloys was studied by optical microscope(OM),X-ray diffraction and scanning electron microscope(SEM)in this paper.And the effects of Ca content on the micro-hardness and compressive properties of Mg-8Sn alloy were investigated.The results show that the rod-like and needle-like CaMgSn phase formed in Mg-8Sn alloy with Ca addition.The size of CaMgSn laths increased with the increase of Ca content.Meanwhile,Ca addition refined the grain size.The addition of Ca improves the strength of Mg-8Sn alloy and decrease the elastic of Mg-8Sn alloy.However,when the Ca content reached to 1%,the continue increase of Ca content created a weak effect on the strength improvement and obviously reduced the elastic of Mg-Sn alloy.Mg-8Sn-1Ca alloy obtained an improved strength with a preferable elastic.
引文
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[6] Do Hyung Kim1,Ju Youn Lee et al.The Effect of Microstructure Evolution on the Elevated Temperature Mechanical Properties in Mg-Sn-Ca System[J].Materials Transactions,2008(10):2405-2413.
[7] YANG Ming-bo(杨明波),CHENG Liang(程亮),PAN Fu-sheng(潘复生).Comparison of as-cast microstructure,tensile and creep properties for Mg-3Sn-1Ca and Mg-3Sn-2Ca magnesium alloys[J].Trans.Nonferrous Met.Soc.China,2010(20):584-589.
[8] K.SURESH1,K.P.RAO,Y.V.R.K.PRASAD,N.HORT3,K.U.KAINER,Microstructure and mechanical properties of as-cast Mg-Sn-Ca alloys and effect of alloying elements[J].Trans.Nonferrous Met.Soc.China 2013(23):3604-3610.
[9] Mingbo Yang, Xiaofeng Liang et al.Effects of zirconium addition on as-cast microstructure and mechanical properties of Mg-3Sn-2Ca magnesium alloy[J].Materials and Design,2011(32):1967-1973.
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[11]苏世卿,王玉洁,孙浩.Zr含量对Mg-2Gd-1Zn合金显微组织及力学性能的影响[J].铸造技术,2017,38(09):2111-2114.
[2] Palash Poddar,K.L.Sahoo.Microstructure and mechanical properties of conventional cast and rheocast Mg-Sn based alloys[J].Materials Science&Engineering A,2012(556):891-905.
[3]蒋斌,潘复生,等.第二相对Mg-Ca-Sn镁合金铸态组织和力学性能的影响[J].稀有金属材料与工程,2014,43(10):2445-2449.
[4]刘红梅,陈云贵,等.铸态Mg-Sn二元合金的显微组织与力学性能[J].四川大学学报(工程科学版),2006,38(2):90-94.
[5]李世成,陈云贵,等.铸态Mg-5Sn-(0~3)Sr合金的组织和性能[J].特种铸造及有色合金,2011,31(4):369-372.
[6] Do Hyung Kim1,Ju Youn Lee et al.The Effect of Microstructure Evolution on the Elevated Temperature Mechanical Properties in Mg-Sn-Ca System[J].Materials Transactions,2008(10):2405-2413.
[7] YANG Ming-bo(杨明波),CHENG Liang(程亮),PAN Fu-sheng(潘复生).Comparison of as-cast microstructure,tensile and creep properties for Mg-3Sn-1Ca and Mg-3Sn-2Ca magnesium alloys[J].Trans.Nonferrous Met.Soc.China,2010(20):584-589.
[8] K.SURESH1,K.P.RAO,Y.V.R.K.PRASAD,N.HORT3,K.U.KAINER,Microstructure and mechanical properties of as-cast Mg-Sn-Ca alloys and effect of alloying elements[J].Trans.Nonferrous Met.Soc.China 2013(23):3604-3610.
[9] Mingbo Yang, Xiaofeng Liang et al.Effects of zirconium addition on as-cast microstructure and mechanical properties of Mg-3Sn-2Ca magnesium alloy[J].Materials and Design,2011(32):1967-1973.
[10]杨明波,潘复生,等.镁合金铸态晶粒细化技术的研究进展[J].铸造,2005,54(4):314-319.
[11]苏世卿,王玉洁,孙浩.Zr含量对Mg-2Gd-1Zn合金显微组织及力学性能的影响[J].铸造技术,2017,38(09):2111-2114.