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Abstract

The intermetallic phases within an as-cast and rolled Al–Li–Cu–Mg alloy have been characterized using quantitative X-ray microanalysis and back-scattered electron imaging. An Al–Cu–Mg eutectic and an Al/Cu-rich intermetallic resembling A1₆( Fe, Cu) are the principal constituents of the as-cast alloy. During homogenization and fabrication, the eutectic dissolves but the iron-rich phase is broken up into stringers which lie along the high-angle grain boundaries. Void initiation at the particles during deformation of the wrought material has been observed and quantified. Voids nucleate following either particle cracking or particle/matrix decohesion. Evidence for particle cracking caused by coplanar slip band impingement is presented based on electron microscopical observations of specimens deformed conventionally and in situ.

MST/569

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References

SANDERS

T. H.

and BALMUTH

E. S.

: Met. Frog., 1978, 113, 32.

PEEL

C. J.

, EVANS

, BAKER

C. A.

, BENNETT

D. A.

, GREGSON

P. J.

, and FLOWER

H. M.

: in ‘Al—Li alloys’, (ed. Sanders

T. H.

and. Starke

E. A.

), 363; 1984, New York, American Institute of Mining, Metallurgical, and Petroleum Engineers.

SANDERS

T. H.

and STARKE

E. A.

: Acta Metall., 1982, 30, 927.

VASUDEVAN

A. K.

, MILLER

A. C.

, and ICERSKER

M. M.

: in ‘Al—Li alloys’, (ed. Sanders

T. H.

and Starke

E. A.

), 181; 1984, New York, American Institute of Mining, Metallurgical, and Petroleum Engineers.

MILLER

W. S.

, THOMAS

M. P.

, LLOYD

D. J.

, and CREBER

: in ‘Aluminium—lithium alloys III’, (ed. Baker

et al.), 584; 1986, London, The Institute of Metals.

BUTLER

E. P.

, OWEN

N. J.

, and FIELD

D. J.

: Mater. Sci. Technol., 1985, 1, 531.

BALL

M. D.

and McCARTNEY

D. G.

: J. MiCrOSC., 1981, 124, 57.

DANGUY

and QUIVY

: J. Phys. Radium, 1956, 16, 320.

TomLIN

S. G.

: Proc. Phys. Soc., 1986, 82, 465.

10.

BISHOP

H. E.

: ‘Optiques des rayon X et microanalyse’, (ed. R. Castiange et al.), 153; 1966, Paris, Hermann.

11.

REED

S. J. B.

: ‘Electron microprobe analysis’, 219-239; 1975, Cambridge, Cambridge University Press.

12.

BROEK

: ‘A study on ductile fracture’, Report NLR-TR 71021 U, National Aerospace Laboratory, The Netherlands, 1972.

13.

GOODS

S. H.

and BROWN

L. M.

: Acta Metall., 1979, 27, 1.

14.

MONDOLFO

L. F.

: ‘Aluminium alloys: structure and properties’; 1976, London, Butterworths.

15.

KAR

R. J.

, BOHLEN

J. W.

, and CHANANI

G. R.

: in ‘Al—Li alloys’, (ed. Sanders

T. H.

and Starke

E. H.

), 255; 1984, New York, American Institute of Mining, Metallurgical, and Petroleum Engineers.

16.

PHRAGMEN

: J. Inst. Met., 1950, 77, 489.

17.

FENG

W. X.

and LIN

F. S.

: J. Mater. Sci., 1984, 19, 2079.

18.

SPEIDEL

M. O.

: in ‘Light metals’; 1975, Düsseldorf, Aluminium-Verlag.

19.

BROWNRIGG

, SPITZIG

W. A.

, RICHMOND

, TIERLINCK

, and EMBURY

J. D.

: Acta Metall., 1983, 31, 1141.

20.

EMBURY

ROY, D.

, EDWARDS

, and ASHBY

M. F.

: Acta Metall., 1981, 29, 1509.

21.

BROWN

L. M.

and STOBBS

w. M.

: Philos. Mag., 1976, 34, 351.

22.

BROWN

L. M.

and EMBURY

J. D.

: in Proc. 3rd Int. Conf. on ‘Strength of metals and alloys’, Cambridge 1973, 164.

Initiation of voiding at second-phase particles in a quaternary Al–Li alloy

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