Al对压铸Mg-10Zn合金热裂性及微观组织的影响
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摘要
研究了不同Al含量(0,2%,3.5%,5%,质量分数)对压铸Mg-10Zn合金的热裂敏感系数(H_(TS))及显微组织的影响。结果表明,随着Al含量增加,合金的热裂敏感系数逐渐降低;结合热力学计算(Pandat8.0)Mg-10Zn-yAl合金的凝固行为,发现热裂敏感系数随合金凝固区间减小和末期液相体积分数的增加而降低,可有效判断合金热裂敏感系数变化趋势。显微组织分析表明,Al可有效细化铸态Mg-10Zn合金的晶粒尺寸。随Al含量增加,合金中第二相数量增加。压铸态Mg-10Zn合金的第二相主要为Mg_5Zn_2,Mg-10Zn-yAl合金的第二相为Mg_(62～69)Zn_(22～25)Al_(6～16)准晶相(I相)。
Hot tearing susceptibility(H_(TS))and microstructure evolution of die casting Mg-10Zn-yAl(y=0,2,3.5,5)alloys(ZA series alloys)were investigated.The H_(TS)of alloys was investigated using rod die casting mold and it was determined based on the location and quantity of cracks in the rods.The H_(TS)results show that Al is effective to improve the hot tearing resistance of ZA series alloys.The H_(TS)of ZA105 alloy reaches the lowest value.Thermodynamic calculation software(Pandat8.0)was used to calculate solidification paths of ZA series alloys.The results reveal that the correlation between H_(TS) and Flep(liquid fraction at the end of primary solidification)is negative,while it between H_(TS) and F_(TR)(freezing temperature range)is positive.Microstructure analysis by EDS and XRD confirms that Al addition can refine effectively the grain size in the Mg-10Zn alloy.With increasing in Al addition,the amounts of secondary phase are increased,where the secondary phase is mainly Mg_5Zn_2 in the ascast Mg-10Zn alloy and it is mainly quasicrystal phase(Mg_(62～69)Zn_(22～25)Al_(6～16))in the other alloys.
Hot tearing susceptibility(H_(TS))and microstructure evolution of die casting Mg-10Zn-yAl(y=0,2,3.5,5)alloys(ZA series alloys)were investigated.The H_(TS)of alloys was investigated using rod die casting mold and it was determined based on the location and quantity of cracks in the rods.The H_(TS)results show that Al is effective to improve the hot tearing resistance of ZA series alloys.The H_(TS)of ZA105 alloy reaches the lowest value.Thermodynamic calculation software(Pandat8.0)was used to calculate solidification paths of ZA series alloys.The results reveal that the correlation between H_(TS) and Flep(liquid fraction at the end of primary solidification)is negative,while it between H_(TS) and F_(TR)(freezing temperature range)is positive.Microstructure analysis by EDS and XRD confirms that Al addition can refine effectively the grain size in the Mg-10Zn alloy.With increasing in Al addition,the amounts of secondary phase are increased,where the secondary phase is mainly Mg_5Zn_2 in the ascast Mg-10Zn alloy and it is mainly quasicrystal phase(Mg_(62～69)Zn_(22～25)Al_(6～16))in the other alloys.
引文
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[29]YUAN G Y,KENJI A,HIDEMI K.Structure and mechanical properties of cast quasicrystal-reinforced Mg-Zn-Al-Y base alloys[J].Mater.Res.,2004,19:1 531-1 537.
[30]ZHEN Z S,HORT N,HUANG Y,et al.Hot tearing behaviour of binary Mg-1Al alloy using a contraction force measuring method[J].Int.J.Cast Metal Res.,2009,22:331-334.
[31]SONG J,PAN F,JIANG B,et al.A review on hot tearing of magnesium alloys[J].Journal of Magnesium and Alloys,2016,4(3):151-172.
[32]WANG Z,HUANG Y D,SRINIVASAN A,et al.Influences of Y additions on the hot tearing susceptibility of Mg-1.5Zn alloys[J].Mater.Sci.Forum,2013,765:306-310.
[33]EASTON M A,WANG H,GRANDFIELD J,et al.Observation and prediction of the hot tear susceptibility of ternary Al-Si-Mg alloys[J].Metall.Mater.Trans.,2012,A43:3 227-3 238.
[34]BOURGEOIS L,MENDIS C L,MUDDLE B C.Characterization of quasicrystalline primary intermetallic particles in Mg-8Zn-4Al casting alloy[J].Philos.Mag.Lett.,2001,81:709-718.
[35]VOGEL M,KRAFT O,DEHM G.Quasi-crystalline grainboundary phase in the magnesium die-cast alloy ZA85[J].Scripta Mater.,2001,45(5):517-524.
[36]VOGEL M,KRAFT O,ARZT E.Creep behavior of magnesium die-cast alloy ZA85[J].Scripta Mater.,2003,48(8):985-990.
[2]LUO A,PEKGULERYUZ M O.Cast magnesium alloy selevated temperature applications[J].Mater.Sci.,1994,29:5 259-5 271.
[3]FOERSTER G S.New developments in magnesium die casting[A].In Proceedings of the IMA 33th Annual Meeting[C].Canada,Quebec,Montreal,1976.
[4]MILLER W K.Creep of die cast AZ91magnesium at room temperature and low stress[J].Metall.Mater.Trans.,1991,A22(4):873-877.
[5]SHABADI R,AMBAT R,DWARAKADASA E S.AZ91Cmagnesium alloy modified by Cd[J].Mater.Des.,2014,53:445-451.
[6]VOGEL M,KRAFT E,ARZT O.Creep behavior of magnesium die-cast alloy ZA85[J].Scripta Mater.,2003,48:985-990.
[7]NIE J F.Precipitation and hardening in magnesium alloys metall[J].Mater.Trans.,2012,A43:3 891-3 939.
[8]WEI L Y,DUNLOP G L,WESTENGEN H.Precipitation hardening of Mg-Zn and Mg-Zn-RE alloys[J].Metall.Mater.Trans.,1995,A26:1 705-1 716.
[9]SINGH ALOK,TSAI A P.Structural characteristics ofβ′1precipitates in Mg-Zn-based alloys[J].Scripta Mater.,2007,57(10):941-944.
[10]CLARKE J B.Transmission electron microscopy study of age hardening in a Mg-5Zn alloy[J].Acta Metall.,1965,13(12):1 281-1 289.
[11]ROKHLIN L L,ORESHKINA A A.Research into the structure of a metastable phase formed during the breakdown of a supersaturated solution in magnesium-zinc alloys[J].Fiz.Metal.Metalloved,1988,66:159-164.
[12]GAO X,NIE J F.Characterization of strengthening precipitate phases in a Mg-Zn alloy[J].Scripta Mater.,2007,56(8):645-648.
[13]YARMOLYUK Y P,KRIPYAKEVICH P I,MEL′NIK E V.Crystal structure of the compound Mg4Zn7[J].Sov.Phys.Crystallogr,1975,20:329-340.
[14]PARK S S,BAE G T,KANG D H,et al.Microstructure and tensile properties of twin-roll cast Mg-Zn-Mn-Al alloys[J].Scripta Mater.,2007,57(9):793-796.
[15]HOFSTETTER J,REDI S,BAUMGARTNER I.Processing and microstructure-property relations of high-strength low-alloy(HSLA)Mg-Zn-Ca alloys[J].Acta Mater.,2015,98:423-432.
[16]WANG J,LIU R D,LUO T J,et al.A high strength and ductility Mg-Zn-Al-Cu-Mn magnesium alloy[J].Mater.Des.,2013,47:746-749.
[17]CHEN B Q,ZHANG J.Microstructure and mechanical properties of ZK60-Er magnesium alloys Mater[J].Sci.Eng.,2015,A633:154-160.
[18]LIU L Z,CHEN X H,PAN F S.Effect of Y and Ce additions on microstructure and mechanical properties of Mg-Zn-Zr alloys[J].Mater.Sci.Eng.,2015,A644:247-253.
[19]CLYNE T W,DAVIES G J.Influence of composition on solidification cracking susceptibility in binary alloy systems[J].Brit.Foundry,1981,A1:65-73.
[20]ESKIN D G,SUYITN O,KATGERMAN L.Mechanical properties in the semi-solid state and hot tearing of aluminium alloys[J].Prog.Mater.Sci.,2004,49:629-711.
[21]ZHOU L,HUANG Y D,MAO P L.Magnesium Technology2011[A].TMS,Warrendale,PA,2011.
[22]BICHLER L,RAVINDRAN C.New developments in assessing hot tearing in magnesium alloy castings[J].Mater.Des.,2010,31:17-23.
[23]ESKIN D G,KATGERMAN L.A quest for a new hot tearing criterion[J].Metall.Mater.Trans.,2007,A38:1 511-1 519.
[24]GUNDE P,SCHIFFL A,UGGOWITZER P J.Influence of yttrium additions on the hot tearing susceptibility of magnesium-zinc alloys[J].Mater.Sci.Eng.,2010,A527(26):7 074-7 079.
[25]HUANG Y D,WANG Z,SRINIVASAN A.Metallurgical characterization of hot tearing curves recorded during solidification of magnesium alloys[J].Acta Phys.Pol.,2012,A122:497-500.
[26]CAO G,ZHANG C,CAO H.Hot-tearing susceptibility of ternary Mg-Al-Sr Alloy castings[J].Metall.Mater.Trans.,2010,A41:706-716.
[27]CAO G,HAYGOOD I,KOU S.Onset of hot tearing in ternary Mg-Al-Sr alloy castings[J].Metall.Mater.Trans.,2010,A41:2 139-2 150.
[28]GAO X,NIE J F.Structure and thermal stability of primary intermetallic particles in an Mg-Zn casting alloy[J].Scripta Mater.,2007,57(7):655-658.
[29]YUAN G Y,KENJI A,HIDEMI K.Structure and mechanical properties of cast quasicrystal-reinforced Mg-Zn-Al-Y base alloys[J].Mater.Res.,2004,19:1 531-1 537.
[30]ZHEN Z S,HORT N,HUANG Y,et al.Hot tearing behaviour of binary Mg-1Al alloy using a contraction force measuring method[J].Int.J.Cast Metal Res.,2009,22:331-334.
[31]SONG J,PAN F,JIANG B,et al.A review on hot tearing of magnesium alloys[J].Journal of Magnesium and Alloys,2016,4(3):151-172.
[32]WANG Z,HUANG Y D,SRINIVASAN A,et al.Influences of Y additions on the hot tearing susceptibility of Mg-1.5Zn alloys[J].Mater.Sci.Forum,2013,765:306-310.
[33]EASTON M A,WANG H,GRANDFIELD J,et al.Observation and prediction of the hot tear susceptibility of ternary Al-Si-Mg alloys[J].Metall.Mater.Trans.,2012,A43:3 227-3 238.
[34]BOURGEOIS L,MENDIS C L,MUDDLE B C.Characterization of quasicrystalline primary intermetallic particles in Mg-8Zn-4Al casting alloy[J].Philos.Mag.Lett.,2001,81:709-718.
[35]VOGEL M,KRAFT O,DEHM G.Quasi-crystalline grainboundary phase in the magnesium die-cast alloy ZA85[J].Scripta Mater.,2001,45(5):517-524.
[36]VOGEL M,KRAFT O,ARZT E.Creep behavior of magnesium die-cast alloy ZA85[J].Scripta Mater.,2003,48(8):985-990.
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