二次挤压对SiCp/2009Al复合材料微观结构和力学性能的影响
EFFECTS OF DOUBLE EXTRUSION ON THE MICROSTRUCTURE AND TENSILE PROPERTY OF THE PM PROCESSED SiCp/2009Al COMPOSITES
Received date: 2010-04-30
Revised date: 2010-05-24
Online published: 2010-09-11
刘振宇 , 王全兆 , 马宗义 , 肖伯律 , 刘越 . 二次挤压对SiCp/2009Al复合材料微观结构和力学性能的影响[J]. 金属学报, 2010 , 46(9) : 1121 -1127 . DOI: 10.3724/SP.J.1037.2010.00207
Powder metallurgy (PM), as an important method of fabricating SiC particle reinforced aluminum matrix (SiCp/Al) composites, has advantages in obtaining good interfacial bonding and enhancing tensile strength over casting or infiltrating method. The primary process of the PM method involves mixing, compaction and subsequent secondary plastic deformation. Especially, secondary plastic deformation is an important process to destroy the oxidation film on the Al particle surfaces and enhance Al-SiC bonding. However, the incorporation of the SiC particles restricts plastic flow ability of the composite and makes it difficult to be subjected to heavy single-step plastic deformation, such as single hot extrusion, hot rolling or hot forging. Instead, multi-step deformation is a critical processing approach for the SiCp/Al composites with low deformability. However, the previous attentions were mostly focused on single-step processing, multi--step plastic deformation of the SiCp/Al composites was seldom discussed. In this paper, 20%SiCp/2009Al (volume fraction) composite was fabricated using a common PM method and the effects of double extrusion on the microstructure and tensile property of the composite were investigated. It is indicated that the double extrusion could refine the SiCp size, align the SiCp and increase the aspect ratio of the SiCp, but did not exert critical effects of the grain size and <111> texture of the matrix. However, the average distance between the SiCp along the extrusion direction increased after the double extrusion, more easily inducing a SiCp-poor band which aligned approximately perpendicularly to the extrusion direction. This resulted in a decrease in the strength and an increase in the elongation along the extrusion direction.
Key words： powder metallurgy; composite; aluminum alloy; double extrusion; SiCp-poor band
[1] Ibrahim I A, Mohamed F A, Lavernia E J. J Mater Sci, 1991; 26: 1137
[2] Torralba J M, da Costa C E, Velasco F. J Mater Proc Technol, 2003; 133: 203
[3] Ralph B, Yuen H C, Lee W B. J Mater Proc Technol, 1997; 63: 339
[4] Miracle D B. Compos Sci Technol, 2005; 65: 2526
[5] Liu Y B, Lim S C, Lu L, Lai M O. J Mater Sci, 1994; 29: 1999
[6] Cocen U, Onel K. Compos Sci Technol, 2002; 62: 275
[7] Carvalho M H, Marcelo T, Carvalhinhos H, Sellars C M. J Mater Sci, 1992; 27: 2101
[8] Sun X W, Zeng S M, Chen Z Q, Cheng N P. J Southwest China Norm Univ (Nat Sci Ed), 2005; 30: 888
(孙旭炜, 曾苏民, 陈志谦, 程南璞. 中南大学学报(自然科学版), 2005; 30: 888)
[9] Hanada K, Murakoshi Y, Negishi H, Sano T. J Mater Proc Technol, 1997; 63: 405
[10] Davies C H J, Chen W C, Hawbolt E B, Samarasekera I V, Brimacombe J K. Scr Metall Mater, 1995; 32: 309
[11] Davies C H J, Chen W C, Lloyd D, Hawbolt E B, Samarasekera I V, Brimacombe J K. Metal Mater Trans, 1996; 27A: 4113
[12] Rahmani F R, Akhlaghi F. J Mater Proc Technol, 2007; 187–188: 433
[13] Yang N, Boselli J, Gregson P, Sinclair I. Mater Sci Technol, 2000; 16: 797
[14] Yang N, Boselli J, Sinclair I. J Microscopy, 2001; 201: 189
[15] Boselli J, Gregson P J, Sinclair I. Mater Sci Eng, 2004; A379: 72
[16] Tham L M, Gupta M, Cheng L. Mater Sci Eng, 2002; A326: 355
[17] Humphreys J F, Hatherly M. Recrystallization and Related Annealing Phenomena. 2nd Ed., UK: Elsevier Ltd, 2004: 427
[18] Mitra R, Mahajan Y. Bull Mater Sci, 1995; 18: 405
[19] Flom Y, Arsenault R J. Acta Metall, 1989; 37: 2413
[20] Milan M, Bowen P. J Mater Eng Perform, 2004; 13: 775
[21] Nardone V C, Prewo K M. Scr Metall, 1986; 20: 43
[22] Liu Z Y, Wang Q Z, Xiao B L, Ma Z Y, Liu Y. Mater Sci Eng, 2010, doi:10.1016/j.msea.2010.05.006
/
| 〈 |
|
〉 |
