Ca-Y复合变质对高硅Mg-Si-Zn合金组织与性能的影响
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摘要
为提高高硅Mg-Si-Zn合金的性能,实验通过调整Ca、Y变质剂的含量,研究在Ca变质、Ca-Y复合变质作用下高硅Mg-Si-Zn合金的凝固组织与性能。结果表明:在Mg-4Si-4Zn合金中加入Ca,可使合金凝固组织中初生Mg2Si相由粗大的枝晶形貌转变为细小的矩形块状形貌,共晶组织由粗大的汉字状转变为点棒状;当Ca加入量为0.7%时(质量分数)变质效果最为明显;当Ca加入量超过0.7%后,合金中会形成CaMgSi棒状相,这是Ca变质效果下降的一个主要原因。当合金中Ca加入量为0.7%时,再加入Y会将初生Mg_2Si相由规则平整形貌转变为带有沟壑孔洞的复杂形貌,而相的尺寸基本不发生改变,这使得经Ca-Y复合变质的Mg-4Si-4Zn合金的硬度显著高于Ca单一变质合金的,硬度提高超过10%。
By changing the addition of Ca and Y, the solidified microstructure and properties of Mg-Si-Zn alloy with high Si content were investigated under the condition of Ca modification and Ca-Y compound modification. The results show that, the Ca addition in to Mg-4 Si-4Zn alloy has obvious modification effect, with the primary phase morphology of Mg_2Si transforming from big dendrite to small regular square block and the morphology of eutectic Mg_2Si changing from complex Chinese pattern to point bar. The most obvious effect of modification is near the Ca addition of 0.7%(mass fraction), and CaMgSi bar phase will precipitate from the alloy melt while Ca addition is more than 0.7%, reducing the Ca modification. When the Ca addition is 0.7%, the primary Mg_2Si transforms from regular square to complex morphology with ravine holes without the obvious change of phase size by the Y addition. The alloy hardness after Ca-Y compound modification is obviously higher than that after Ca modification, with the hardness increasing by more than 10%.
By changing the addition of Ca and Y, the solidified microstructure and properties of Mg-Si-Zn alloy with high Si content were investigated under the condition of Ca modification and Ca-Y compound modification. The results show that, the Ca addition in to Mg-4 Si-4Zn alloy has obvious modification effect, with the primary phase morphology of Mg_2Si transforming from big dendrite to small regular square block and the morphology of eutectic Mg_2Si changing from complex Chinese pattern to point bar. The most obvious effect of modification is near the Ca addition of 0.7%(mass fraction), and CaMgSi bar phase will precipitate from the alloy melt while Ca addition is more than 0.7%, reducing the Ca modification. When the Ca addition is 0.7%, the primary Mg_2Si transforms from regular square to complex morphology with ravine holes without the obvious change of phase size by the Y addition. The alloy hardness after Ca-Y compound modification is obviously higher than that after Ca modification, with the hardness increasing by more than 10%.
引文
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[15]CHEN Ke,LI Zi-quan.Effect of co-modification by Ba and Sb on the microstructure of Mg2Si/Mg-Zn-Si composite and mechanism[J].Journal of Alloys and Compounds,2014,592(15):196-201.
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[2]AJITHKUMAR K K,VISWANATH A,PILLAIi U T S.Influence of neodymium addition on the microstructure,mechanical and thermal properties of Mg-Si alloys[C]//6th International Conference on Creep,Fatigue and Creep-Fatigue Interaction[CF-6].Kalpakkam:Elsevier Procedia,2013:103-108.
[3]LOTFPOUR M,EMAMY M,ALLAMEH S H,POURBAHARIB.Effect of hot extrusion on microstructure and tensile properties of Ca Modified Mg-Mg2Si composites[J].Procedia Materials Science,2015,11:38-43.
[4]SU C Y,LI D J,LUO A A,YING T,ZENG X Q.Effect of solute atoms and second phases on the thermal conductivity of Mg-REalloys:A quantitative study[J].Journal of Alloys and Compounds,2018,747(30):431-437.
[5]FANG Xiao-gang,LV Shu-lin,ZHAO Li,WANG Jing,LIULong-fei,WU Shu-sen.Microstructure and mechanical properties of a novel Mg-RE-Zn-Y alloy fabricated by rheo-squeeze casting[J].Materials&Design,2016,94(15):353-359.
[6]WANG Li-ping,GUO Er-jun,MA Bao-xia.Modification effect of lanthanum on primary phase Mg2Si in Mg-Si alloys[J].Journal of Rare Earths,2008(1):105-109.
[7]PENG Lei,CHEN Gang,ZHAO Yu-tao,HUANG Kang,SHAOYang.Influence of solution treatment on microstructure and properties of in-situ Mg2Si/AZ91D composites[J].Transactions of Nonferrous Metals Society of China,2011,21(11):2365-2371.
[8]MOSLISH S,EMAMY M,MAJDI H.The effect of Si and extrusion process on the microstructure and tensile properties of Mg-Mg2Si composite[J].Procedia Material Science,2015,6(12):79-83
[9]宋海宁,袁广银,王渠东,朱燕萍,丁文江.耐热Mg-Zn-Si-Ca合金的显微组织和力学性能[J].中国有色金属学报,2002,12(5):956-960.SONG Hai-ning,YUAN Guang-yin,WANG Qu-dong,ZHUYan-ping,DING Wen-jiang.Microstructure and mechanical properties of heat resistant Mg-Zn-Si-Ca alloy[J].The Chinese Journal of Nonferrous Metals,2002,12(5):956-960
[10]郝帅,邱克强,尤俊华,曲广学.Ca和Sr对铸态Mg-Sn-Si合金组织和性能的影响[J].材料与冶金学报,2012,11(4):285-291.HAO Shuai,QIU Ke-qiang,YOU Jun-hua,QU Guang-xue.Effect of Ca and Sr additions on microstructure and mechanical properties of as-cast Mg-Sn-Si alloys[J].Journal of Materials and Metallurgy,2012,11(4):285-291.
[11]LI Jin-feng,GENG Hao-ran,WANG Ying-zi,QI Xiao-gang.Effects of Si and Y on microstructure and properties of Mg-Zn-Al magnesium alloy[J].Hot Working Technology,2004(12):7-9.
[12]豆琦,杜军,吴华懂,李伟.Ca对过共晶Mg-Si合金中初生Mg2Si相变质的影响[J].热加工工艺,2012,41(7):18-20,23.DOU Qi,DU Jun,WU Hua-dong,LI Wei.Effect of calcium on modification of primary Mg2Si crystals in hypereutectic Mg-Si alloy[J].Hot Working Technology,2012,41(7):18-20,23.
[13]刘辉.变质对过共晶Mg-5Si合金组织及力学性能的影响[D].南昌:南昌航空大学,2014.LIU Hui.Effect of modification on microstructure and mechanical properties of hypereutectic Mg-5Si alloy[D].Nanchang:Nanchang Hangkong University,2014.
[14]JIANG Q C,WANG H Y,WANG Y,MA B X,WANG J G.Modification of Mg2Si in Mg-Si alloys with yttrium[J].Materials Science and Engineering A,2005,392(1/2):130-135.
[15]CHEN Ke,LI Zi-quan.Effect of co-modification by Ba and Sb on the microstructure of Mg2Si/Mg-Zn-Si composite and mechanism[J].Journal of Alloys and Compounds,2014,592(15):196-201.
[16]毛丽萍,王峰,刘正.镁合金热力学相图[M].北京:机械工业出版社,2014:11.MAO Li-ping,WANG Feng,LIU Zheng.Thermodynamics and diagram of magnesium alloy[M].Beijing:China Machine Press,2014:11.