Recrystallization kinetics of Al–Mg alloys AA 5056 and AA 5083 after hot deformation

Abstract

Slabs of two commercial Al–Mg alloys were hot rolled on a laboratory mill. A wide range of processing parameters was used in the experimental design and the effect of those parameters on the annealing kinetics was established. The effects of each parameter are described by simple empirical relationships. The recrystallization time required for a given volume fraction recrystallized was found to decrease with increasing total hot strain and with decreasing initial grain size. The recrystallization time also decreased with increasing temperature compensated strain rate. The annealing temperature also has a profound effect. Empirical relationships incorporating all the process variables are presented, and it is shown that the alloy AA 5056 recrystallizes more readily than does alloy AA 5083. It is concluded that this observation arises because of the larger volume fraction of precipitates present in the homogenized 5083 alloy.

MST/357

Get full access to this article

View all access options for this article.

References

BARRACLOUGH

D. R.

and SELLARS

C. M.

: Met, Sci., 1979, 13, 257.

TOWLE

D. J.

and GLADMAN

: Met. Sci., 1979, 13, 246.

SELLARS

C. M.

and WHITEMAN

J. A.

: Met. Sci., 1979, 13, 187.

JONAS

J. J.

, SELLARS

C. M.

, and McG

W. M.

. TEGART: Metall. Rev., 1969, 14, 1.

McQUEEN

H. J.

and JONAS

J. J.

: in ‘Plastic deformation of metals’, (ed. Arsenault

R. J.

), 281; 1975, New York, Academy Press.

SELLARS

C. M.

: in ‘Hot working and hot forming’, (ed. Sellars

C. M.

and Davies

W. J.

), 3; 1979, London, The Metals Society.

DJAIC

R. A. P.

and JONAS

J. J.

: J. Iron Steel Inst., 1972, 210, 256.

DIAIC

R. A. P.

and JONAS

J. J.

: Metall. Trans., 1973, 4, 621.

ENGLISH

A. T.

and BACKOFEN

W. A.

: Trans. AIME, 1964, 230, 369.

10.

SPEICH

G. R.

and FISHER

R. M.

: in ‘Recrystallisation, grain growth and texture’, (ed. Margolin

, 563; 1966, Metals Park, Ohio, The American Society for Metals.

11.

CAHN

J. W.

: Ada Metall., 1956,4, 449.

12.

RAGHUNATHAN

and SHEPPARD

: in ‘Aluminium technology ‘86’, (ed. Sheppard

), 357; 1986, London, The Institute of Metals.

13.

JOHNSON

W. A.

and MEHL

R. F.

: Trans. AIME, 1939, 135, 416.

14.

AVRAMI

: J. Chem. Phys., 1939, 7, 1103.

15.

AVRAMI

: J. Chem. Phys., 1940, 8, 8.

16.

AVRAMI

: J. Chem. Phys., 1941, 9, 117.

17.

GLOVER

and SELLARS

C. M.

: Metall. Trans., 1972, 3, 2271.

18.

WHITTAKER

H. J.

: PhD thesis, The University of Sheffield, 1973.

19.

WRIGIIT

D. S.

and SHEPPARD

: Met. Technol., 1981. 8, 180.

20.

CABRARA

E. D.

: PhD thesis, The University of Sheffield, 1983.

21.

MOULD

P. R.

and COTTERILL

: in ‘Recrystallisation and grain growth in metals’, 43; 1976, London, Surrey University Press.

22.

PRICE

C. W.

: Scr. Metall., 1985, 19, 669.

23.

ZAIDI

m. A.

and SHEPPARD

: Met. Sci., 1982, 16, 229.