摘要(英) |
The precipitation behavior of dispersoids isn’t the same by different homogenization conditions in AA3003 aluminum alloy. It has been found that fine dispersoids form during homogenization at 460℃x9h and lower density of forming dispersoids during homogenization at 600℃x9h. Homogenization at low temperature is inclined to precipitate grey particle Al6(Mn,Fe) and black particle α- Al12(Mn,Fe)3Si at high temperature. To raise homogenization temperature with time, the grey particle Al6(Mn,Fe) tends to solute into matrix and form black particle α- Al12(Mn,Fe)3Si.
The extrusion pressure is determined both with the degree of solution and distribution of dispersoids after homogenization. If the density of dispersoid isn’t high enough, solution would play an important role for extrusion pressure. However, the influence of solution will be replaced by dispersoids when distribution of dispersoids is close.
The recrystallization will influent strength of material after extrusion. The position where recrystallization have lower strength. The results indicated that condition (a) 460℃x9h homogenization treatment could get the best strength after brazing, the next was the condition (b) and condition (d), and the worst was the condition (c)
600℃x9h→460℃x9h due to happening of secondary recrystallization. |
參考文獻 |
[1] P. Furrer and G . Hausch : Metal Science (13)., (1979) , 115.
[2] R. K. BOLINGBROKE, G. J. MARSHALL : The Third
International Conference on ALUMINIUM ALLOYS.
[3] P.C.M. de Haan , J. van Rijkom,J.A.H.Sontgerath : Materials
ScienceForum , vol. 217-222 , (1996) , 765.
[4] Y.J Li*, L. Arnberg : Materials Science and Engineering A347,
(2003) , 130
[5] Y.J Li*, L. Arnberg : Acta Materialia , 51, (2003) , 3415
[6] G . Lang, A. F. Castle et al. : ”Extrusion”, Scientific and
Technical Development, Deutshe Gesellshaft für Metallkunde ,
(1982).
[7] 歐炳隆,劉實中,碩士論文”汽車熱交換器扁平冷凝管用鋁合金
製程與擠型性研究”,1999
[8] Wolf-Dieter Finkelnburg ,Günther Scharf : ET’92 vol II ,
(1992) ,475
[9] Terry Sheppard : Proceedings of Third International Aluminum
Extrusion Technology Seminar., (1984) , 107.
[10] E. Siebel : Chapman&Hall, (1960) , 201.
[11] K. Aschroft and G. S. Lawson : J. Inst. Metals, 89 , (1960-61) ,
369.
[12] Dr. A. J.(Bill) Bryant, Roger A. P. Fielding : Light Metal Age.,
(1998) , 6.
[13] Lefstad, Martin & Reiso, Oddvin : Proceedings of Sixth
International Aluminum Extrusion Technology Seminar., vol I ,
(1996) , 11.
[14] 岡庭 茂 : 日本輕金屬學會., vol. 45. No. 8., (1995) , 471.
[15] M.M. FARAG , M.H. AHMED : Materials Science and
Engineering., 17, (1975) , 131.
[16] Paul Robbins : Proceedings of Sixth International Aluminum
Extrusion Technology Seminar., vol II, (1996) , 207.
[17] Dr. M.P. Clode :Proceedings of Sixth International Aluminum
Extrusion Technology Seminar., vol II, (1992) , 79.
[18] T. Sheppard : Metal Technology., (1981) , 130. |