采用椭圆旋扭管反复凝熔法制备半固态A356铝合金浆料.结果表明:椭圆旋钮管反复凝熔技术具有旋扭强制对流促进初生晶核游离、自搅拌加强熔体剪切、反复凝熔促进形核的作用,可使初生α晶核演变为球形或近球形晶粒.椭圆管长短轴比、旋扭强度以及凝熔频率对半固态浆料的微观组织有显著影响.随着长短轴比、旋扭强度和凝熔频率的增大,晶粒细化和圆整效果显著提高；但长短轴比过大,容易堵塞流道；当旋扭强度超过13.5(°)/cm时,晶粒细化和圆整效果没有明显提高；当凝熔频率超过40 μm-1时,晶粒细化作用不再增强,圆整度反而降低.在椭圆长短轴比为1.8∶1、旋扭强度为13.5(°)/cm、凝熔频率为40 μm-1的条件下可制得晶粒直径细小、形状圆整的半固态浆料.
参考文献
| [1] | KURZ W;TRIV EDI R .Overview,solidification microstructures:Recent developments,future directions[J].Acta Metallurgica Et Materialia,1990,38(01):1-17. |
| [2] | DAVIS S H.Theory of solidification[M].London:cambridge University Press,2001:20-36. |
| [3] | M. Lukasson;D. Apelian;R. DasGupta .Alloy characterization for the new UBE rheocasting process[J].Transactions of the American Foundry Society,2002(110):271-284. |
| [4] | CARDOSO L E;ATKINSON H V;JONES H .Cooling slope casting to obtain thixotropic feedstock:Ⅰ.Observation with a transparent analogue[J].Journal of Materials Science,2008,43(16):5448-5455. |
| [5] | 谭建波,李志勇,王英杰,刘江成,谷超,张江超.倾斜冷却剪切流变参数对半固态AlSi9Mg合金组织的影响[J].中国有色金属学报,2009(04):607-612. |
| [6] | X. R. Yang;W. M. Mao;S. Pei .Preparation of semisolid A356 alloy feedstock cast through vertical pipe[J].Materials Science and Technology: MST: A publication of the Institute of Metals,2007(9):1049-1053. |
| [7] | GUO H M;YANG X J .Rheocasting of aluminum alloy A356 by low superheat pouring with a shear field[J].Acta Metallurgica Sinica,2006,19(05):328-344. |
| [8] | XIE S S;HUANG G J;ZHANG X L .Study on numerical simulation and experiment of fabrication magnesium semi-solid slurry by damper cooling tube method[J].AIP Conference Proceedings,2007,908(01):557-562. |
| [9] | 张小立,谢水生,李廷举,杨浩强,金俊泽.阻尼冷却管法制备A356铝合金半固态浆料的研究[J].稀有金属材料与工程,2007(05):915-919. |
| [10] | 管仁国,李建平,陈礼清,王超.波浪型倾斜板振动过程中合金组织的形成机理[J].材料研究学报,2008(04):363-368. |
| [11] | 陈正周,毛卫民,吴宗闯.多弯道蛇形管浇注法制备半固态A356铝合金浆料[J].中国有色金属学报,2011(01):95-101. |
| [12] | 谭建波,邢书明,李立新,李增民,李讯,曹凤江.半固态A356合金微观组织特征对充型能力的影响[J].中国有色金属学报,2006(04):612-617. |
| [13] | LIU Y Q;FAN Z.Magnesium alloy selection for semi-solid metal processing[A].Tsukuba:National Institute of Advanced Industrial Science and Technology,Japan Society for Technology of Plasticity,2002:587-592. |
| [14] | A. Das;S. Ji;Z. Fan .Morphological development of solidification structures under forced fluid flow: a Monte-Carlo simulation[J].Acta materialia,2002(18):4571-4585. |
| [15] | VOGEL A;CANTOR B .Stability of a spherical particle growing from a stirred melt[J].Journal of Crystal Growth,1977,37:309-316. |
| [16] | DOHERTY R D;HOZIN L;FEEST E A .Microstructure of stircast metals[J].Materials Science and Engineering A,1984,65:181-189. |
| [17] | Shahrooz Nafisi;Reza Ghomaschi .The Microstructural characterization of Semi-solid slurries[J].JOM,2006(6):24-30. |
| [18] | R. A. Martinez;M. C. Flemings .Evolution of Particle Morphology in Semisolid Processing[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,2005(8):2205-2210. |
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