研究了Al-Sr变质剂和锆复合盐细化剂对高近共晶Al-Si合金宏观/微观组织的影响.结果表明:单一Al-Sr变质剂的加入,不仅改变了共晶硅的形貌,同时对合金的组织也有较明显的细化作用.这可能是由于锶的加入,改变了液态金属的结构,导致枝晶尖端前沿生长过冷度增加,降低了枝晶α(Al)固液界面能.当Al-Sr变质剂和锆复合盐细化剂共同作用时,随着熔体中锆含量的增加,铸锭的晶粒度显著减小,当熔体的锆含量超过0.35%,可获得细小、分布均匀的等轴晶,其宏观晶粒尺寸为100～120 μm.与Al-Zr中间合金相比,无论是细化效果还是抗衰退的能力都优于中间合金.
参考文献
| [1] | 熊艳才,刘伯操.铸造铝合金现状及未来发展[J].特种铸造及有色合金,1998(04):0. |
| [2] | P. S. MOHANTY;J. E. GRUZLESKI .GRAIN REFINEMENT MECHANISMS OF HYPOEUTECTIC Al-Si ALLOYS[J].Acta materialia,1996(9):3749-3760. |
| [3] | B. Kulunk;D.J. Zuliani .Applications for the Strontium Treatment of Wrought and Die-Cast Al[J].JOM,1996(10):60-63. |
| [4] | Lu SZ;Hellawell A .Growth mechanisms of silicon in Al-Si alloys[J].Journal of Crystal Growth,1985,73:316-328. |
| [5] | Lu SZ;Hellawell A .The mechanism of silicon modification in aluminum silicon alloys: impurity induced twinning[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1987,18(10):1721-1732. |
| [6] | 廖恒成,丁毅,孙国雄.Effect of strontium on crystallization of Mg2Si phase in Al-Si-Mg casting alloys[J].中国有色金属学会会刊(英文版),2002(03):409-413. |
| [7] | LIAO Heng-cheng;SUN Yu;SUN Guo-xiong .Correlation between mechanical properties and amount of dendrite α-Al phase in as-cast near-eutectic Al-1.6%Si alloys modified with strontium[J].Materials Science and Engineering A,2002,A355:62-66. |
| [8] | 廖恒成.Al-5%Ti-1%B对Sr变质Al-13.0%Si合金组织影响的研究[J].铸造,2000(05):251. |
| [9] | Lee, YC;St.John, DH;Hutt, JEC;Dahle, AK .The effect of grain refinement and silicon content on grain formation in hypoeutectic Al-Si alloys[J].Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing,1999(1):43-52. |
| [10] | LIAO Heng-cheng;SUN Guo-xiong .Mutual poisoning effect between Sr and B in Al-Si casting alloy[J].Scripta Materialia,2003,48:1035-1039. |
| [11] | 李建国,张柏清,马洪涛,方鸿生,马晓华.Al3Ti4B细化剂和Al10Sr变质剂对ZL107合金显微组织的影响[J].中国有色金属学报,2000(03):365. |
| [12] | 余琨,李松瑞,黎文献,肖于德.微量Sc和Zr对2618铝合金再结晶行为的影响[J].中国有色金属学报,1999(04):709-713. |
| [13] | 陆文华;李隆盛;黄良余.铸造合金及其熔炼[M].北京:机械工业出版社,1996:339. |
| [14] | M. Sadayappan;F. A. Fasoyinu;J. Thomson;M. Sahoo .Grain refinement of permanent mold cast silicon brass, silicon bronze and red brass[J].Transactions of the American Foundrymen's Society,1999(107):337-342. |
| [15] | 孙瑜,廖恒成,孙国雄.Zr对Sr变质近共晶Al-Si铸造合金组织的影响[J].东南大学学报(自然科学版),2000(06):47-51. |
| [16] | Moudolfo L F.Aluminum Alloys: Structure and Properties[M].北京:冶金工业出版社,1984:351-353. |
| [17] | 冯端.金属物理学[M].北京:科学出版社,1990:239-248. |
| [18] | Beumler H;Hammerstand A;Wineting B et al.Analysis of modified 319 aluminum alloy[J].AFS Transactions,1985,93:1-12. |
| [19] | A. M. Sammuel;P. Ouellet;F. H. Samuel;H. W. Doty .Microstructural interpretation of thermal analysis of commercial 319 Al alloy with Mg and Sr additions[J].Transactions of the American Foundrymen's Society,1997(105):951-962. |
| [20] | Djurdjevic M;Jiang H;Sokolowski J .On-line prediction aluminum-silicon eutectic modification level using thermal analysis[J].Materials Characterization,2002,46:31-38. |
| [21] | Hunt J D .Steady state columnar and equiaxed growth of dendrite and eutectic[J].Materials Science and Engineering,1984,65:75-83. |
| [22] | 李庆春.铸件形成理论基础[M].北京:机械工业出版社,1982:132-164. |
| [23] | 王为民;边秀房;秦敬玉 .液态Al-Si合金中的共价键及Sr的影响[J].金属学报,1998,34(06):645-649. |
| [24] | 胡汉起.金属凝固[M].北京:冶金工业出版社,1985:56. |
| [25] | 周尧和;胡壮麒;介万奇.凝固技术[M].北京:机械工业出版社,1998:94. |
| [26] | 刘相法,边秀房.TiAl3在铝熔体中结构遗传的动力学研究[J].机械工程学报,1999(03):67. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%