钙对AZ91D镁合金流动性的影响
Effect of Calcium on Fluidity of AZ91D Magnesium Alloy
摘 要
采用螺旋模试验法研究了钙对AZ91D镁合金流动性的影响,并用XRD、EPMA和SEM等方法对合金的物相组成和显微组织进行了分析.结果表明:当在AZ91D镁合金中加入05%的钙时,钙会在晶界富集引起偏析,降低合金的流动性;随着钙添加量的增加,在晶界形成Al2Ca,阻碍了晶粒长大,改善了合金的流动性能;但当钙的添加量超过1.5%后,Al2Ca呈网状分布,又会使其流动性下降.
钙
流动性
螺旋模试验
magnesium alloy
calcium
fluidity
spiral mould test
Abstract
The effects of Ca on the fluidity of AZ91D alloy were studied by spiral mould test.The identification of compositions and the observation of microstructure of the alloys were proceeded by XRD,EPMA,SEM and so on.The results indicate that the fluidity declined with 0.5% Ca addition due to the segregation of Ca at the grain boundaries.But when the quantity of Ca addition increased successively,the fluidity was improved because Al2Ca formed at the grain boundaries to prevent the growth of the grains.When the quantity of Ca addition exceeded 1.5%,the fluidity declined again.It could be explained by the formation of reticular Al2Ca phase.
中图分类号 TG146.2 TG292
所属栏目 材料性能及其应用
基金项目
收稿日期 2007/9/27
修改稿日期 2008/1/10
网络出版日期
作者单位点击查看
备注张亚琴(1978-),女,山西文水人,博士研究生.
引用该论文: ZHANG Ya-qin,MOTEGI Tetsuichi. Effect of Calcium on Fluidity of AZ91D Magnesium Alloy[J]. Materials for mechancial engineering, 2008, 32(10): 63～66
张亚琴,茂木彻一. 钙对AZ91D镁合金流动性的影响[J]. 机械工程材料, 2008, 32(10): 63～66
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【3】曾小勤,王渠东,吕宜振,等.Mg-9Al-0.5Zn-0.1Be-xCa合金的组织和力学性能研究[J].机械工程材料,2001,25(5):104-107.
【4】蒋汉祥,郭 红,马立华,等.加入钙和稀土对AZ91D镁合金起燃温度的影响[J].重庆科技学院学报,2006,8(2):36-38.
【5】闵学刚,孙扬善,高洪涛,等.Ca、Si和Re对AZ91合金的组织和性能的影响[J].东南大学学报:自然科学版,2002,32(3):409-414.
【6】FAN Yu,WU Guo-hua,GAO Hong-tao,et al.Effect of calcium on microstructure ,mechanical properties and corrosion resistance of magnesium alloy[J].The Chinese Journal of Nonferrous Metals,2005,15(2):210-216.
【7】Thaddeus B Massalski.Binary Alloy Phase Diagrams[M].New York:American Society for Metals,1986.
【8】XU Pei-hao,MIN Guang-hui,YU Hua-shun,et al.Effect of Ca on Microstructure and Mechanical properties of ZA85 alloy[J].Materials for Mechanical Engineering,2007,31(1):50-52,85.
【9】Vogel M,Kraft O,Arzt E.Creep behavior of magnesium diecast alloy ZA85[J].Script a Material,2001,45:517-524.
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