。648 北京科技大学学报 2006年第7期 浆料流动平稳，没有明显的液固相偏析现象，这对 成形优质的压铸件极为有利. 200血 图6不同壁厚试片中心部位的显微组织.(a)10mm(b)5mm(c)2.5mm(d)1.25mm Fig 6 Center microstructures of different-thickness sample pieces:(a)10mm (b)5mm (c)2 5 mm:(d)1.25mm USA //Proceeding of the 4th International Conference on the 3结论 Processing of Semi-Sold Alloys and Composite.The Univers- ty of Sheffield.1996:251 (1)成形温度对半固态A356铝合金浆料的 [6 Kyonka C.Status of semi-solid metalworking at Alumax 充填性有明显的影响，较高的成形温度有利于获 Proceeding of the 4th Intemational Conference on the Proces 得良好的充填性. ing of SemiSolid Alloys and Composite.The University of (2)压射比压和压射冲头速度对A356铝合 Sheffield.1996:256 金浆料的充填性影响较大，较高的压射比压和压 [7 Sahm P R.SSM in Eumpe //Proceeding of the 5th Intema- 射冲头速度有利于半固态A356铝合金获得良好 tional Conference on the Pmcessing of Semi-Solid Alloys and 的充填性.在本实验条件下，压射比压越大，充填 Composite.Golden.1998 【习Shibata R.SSM actives in Japan∥Proceeding of the5thlr 性越好：压射冲头速度越大，充填性越好 ternational Conference on the Processing of Semi-Solid Alloys (3)试片的壁厚也对半固态A356铝合金浆 and Composite.Golden 1998:199 料的充填性影响较大.试片壁厚越大，越容易充 [9 Fan Z JiS.Bevis M J.Tw in-screw rheomolding-a new se- 填，充填性越好：而试片壁厚越小，越不容易充填 mi-solid pmocessing technology /Chiametta G L Rosso M. 充填性越差. Proceeding of the 6th Internat ional Conference on Semi-Solid Processing of Alloys and Compositions.Turin:Materials Sci- (4)采用低过热度和弱电磁搅拌技术制备的 ence and Chemical Engineering Department.Politecnico DI 半固态A356铝合金浆料和流变压铸试片的组织 Torinos,2000.61 分布很均匀，这有利于获得优质的半固态压铸件. [10]Potzinger R.Kaufmann H.Uggowitzer P J.Magresium new rheocasting-a novel approach to high qulity magne- 参考文献 siunr castings /Chiametta G L.Rosso M.Proceding of [1]Flemings M C.Behavior of metal alloys in the semisolid state. the 6th Internat ional Conference on Semi-Solid Processing of Metall Trans 1991.2A(5):957 Alloys and Com positions.Turin:Materials Science and [2]Spencer D B M ehrabian R.Femings M C.Rheological be- Chemical Engineering Department Politeenico DI Torino. havior of Sn?15%Pb in the crystallizat ion range.Metall 2000.85 Tans1972,3(7):1925 11]Tausig G.Xia K.Rheocasting and semi-solid foming of a 3]Flemings M C Mehrabian R.Casting semi-solid metals AFS usually wmought aluminum alloy /Proceeding of the 4th I Tans1973,81:81 ternational Conference on the Processing of Semi-Sold Alloys 【鸟毛卫民.半固态金属成形技术.北京：机械工业出版社. and Composite.The University of Sheffield.1996:290 2004 【12毛卫民，钟学友.凝固条件对AISigMg合金半固态加热时 [5]Midson S P.The commercial status of semi-solid casting in the 组织的影响.北京科技大学学报，199820(3)：253浆料流动平稳, 没有明显的液固相偏析现象, 这对 成形优质的压铸件极为有利. 图 6 不同壁厚试片中心部位的显微组织.(a)10 mm;(b)5 mm;(c)2.5 mm;(d)1.25 mm Fig.6 Center mi crostructures of different-thickness sample pieces:(a)10 mm;(b)5 mm;(c)2.5 mm;(d)1.25 mm 3 结论 (1)成形温度对半固态 A356 铝合金浆料的 充填性有明显的影响 , 较高的成形温度有利于获 得良好的充填性 . (2)压射比压和压射冲头速度对 A356 铝合 金浆料的充填性影响较大 ,较高的压射比压和压 射冲头速度有利于半固态 A356 铝合金获得良好 的充填性 .在本实验条件下, 压射比压越大, 充填 性越好;压射冲头速度越大,充填性越好 . (3)试片的壁厚也对半固态 A356 铝合金浆 料的充填性影响较大 .试片壁厚越大 , 越容易充 填,充填性越好 ;而试片壁厚越小, 越不容易充填, 充填性越差. (4)采用低过热度和弱电磁搅拌技术制备的 半固态A356 铝合金浆料和流变压铸试片的组织 分布很均匀,这有利于获得优质的半固态压铸件. 参 考 文 献 [ 1] Flemings M C .Behavior of metal alloys in the semi-solid state . Metall Trans, 1991 , 22A(5):957 [ 2] S pencer D B, M ehrabian R, Flemings M C .Rheological be￾havior of Sn ? 15%Pb in the cryst allization range.Metall Trans, 1972 , 3(7):1925 [ 3] Flemings M C , Mehrabian R.Casting semi-solid metals.AFS Trans, 1973 , 81:81 [ 4] 毛卫民.半固态金属成形技术.北京:机械工业出版社, 2004 [ 5] Midson S P .The commercial st atus of semi-solid casting in the USA ∥Proceeding of the 4th International Conference on the Processing of Semi-Solid Alloys and Composit e.The Universi￾t y of Sheffield , 1996:251 [ 6] Kyonka C .St atus of semi-solid met alw orking at Alumax ∥ Proceeding of the 4th International Conference on the Process￾ing of Semi-Solid Alloys and Composite.The University of S heffield , 1996:256 [ 7] Sahm P R.SSM in Eu rope ∥Proceeding of the 5th Int erna￾tional Conference on the Processing of Semi-Solid Alloys and Composit e.Golden , 1998 [ 8] S hibata R.SSM actives in Japan ∥Proceeding of the 5th In￾t ernational Conference on the Processing of Semi-Solid Alloys and Composit e.Golden , 1998:199 [ 9] Fan Z, Ji S , Bevis M J.Tw in-screw rheomolding —a new se￾mi-solid processing technology ∥ Chiarmett a G L, Rosso M . Proceeding of the 6th Int ernational Conf erence on Semi-Solid Processing of Alloys and Compositions.Turin:Mat erials Sci￾ence and Chemical Engineering Department , Polit ecnico DI Torino , 2000:61 [ 10] Potzinger R, Kaufmann H , Uggow itzer P J.Magnesium new rheocasting —a novel approach to high quality magne￾sium-castings ∥ Chiarmett a G L , Rosso M .Proceeding of the 6th Int ernational Conference on Semi-Solid Processing of Alloys and Com positions.Turin:Materials S cience and Chemical Engineering Department, Politecni co DI T orino , 2000:85 [ 11] Tausig G , Xia K .Rheocasting and semi-solid f orming of a usually w rought aluminum alloy ∥Proceeding of the 4th In￾t ernational Conference on the Processing of Semi-Solid Alloys and Composit e.The University of S heffield , 1996:290 [ 12] 毛卫民, 钟学友.凝固条件对 AlSi 7Mg 合金半固态加热时 组织的影响.北京科技大学学报, 1998 , 20(3):253 · 648 · 北 京 科 技 大 学 学 报 2006 年第 7 期