Effect of heat treatment on Al–7Si–0·35Mg

Abstract

The microstructure and mechanical properties of the optimised Al–0·35Mg–7·0Si cast alloys subjected to solid solution treatment followed by aging treatment have been analysed. The results indicate that the overheating treatment temperature of optimised alloy is 508°C. The mechanical properties of alloy with 495°C ×5 h and 500°C ×4 h solid solution treatment are better than that of other experiment conditions. Tensile strength is 239–243 MPa. Hardness is ∼104 HB. Elongation is 4·4–4·8. The main precipitation phases may have Si, Al₂Cu, Al₆Cu₃Ni and Al_xCuCe phases whose morphology may be long strip, round, ellipse, flake and block. All specimens were fractured in a mixed mode fracture character consisting of a ductile and brittle manner, and the fractographs are in good agreement with the variations in fracture modes and mechanical properties of different samples.

Keywords

Casting Mechanical Microstructure Fractography

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References

Choong

D. L.

: ‘Variability in the tensile properties of squeeze-cast Al–Si–Cu–Mg alloy’, Mater. Sci. Eng. A , 2008, A488, 296–302.

Geoffroy

, Vittecoq

, Birr

, de Mestral

and Martin

J.-M.

: ‘Fatigue behaviour of an arc welded Al–Si–Mg alloy’, Scr. Mater. , 2007, 57, 349–352.

Shah

K. B.

, Kumar

S. D.

and Dwivedi

D. K.

: ‘Aging temperature and abrasive wear behaviour of cast Al–(4,12,20)Si–0·3 Mg alloys’, Mater. Des. , 2007, 28, 1968–1974.

Timann

, Detlef

and Jochen

: ‘Damage mechanisms of cast Al–Si–Mg alloys under superimposed thermal–mechanical fatigue and high-cycle fatigue loading’, Mater. Sci. Eng. A , 2007, A468–A470, 184–92.

Eshaghi

, Ghasemi

H. M.

and Rassizadehghani

: ‘Effect of heat treatment on microstructure and wear behavior of Al–Si alloys with various iron contents’, Mater. Des. , 2011, 32, 1520–1525.

Yao

J. Y.

, Graham

D. A.

, Rinderer

and Couper

M. J.

: ‘A TEM study of precipitation in Al–Mg–Si alloys’, Micron , 2001, 32, 865–870.

Zhang

X. H.

, Su

G. C.

, Han

Y. Y.

, Ai

X. H.

and Yan

W. L.

: ‘A study on the composition optimization and mechanical properties of Al–Mg–Si cast alloys’, Mater. Sci. Eng. A , 2010, A527, 3852–3856.

Zhang

X. H.

, Su

G. C.

, Ju

C. W.

, Wang

W. C.

and Yan

W. L.

: ‘Effect of modification treatment on the microstructure and mechanical properties of Al–0·35Mg–7·0Si cast alloy’, Mater. Des. , 2011, 31, 4408–4413.

Osorio

W. R.

, Garcia

L. R.

, Goulart

P. R.

and Garcia

: ‘Effects of eutectic modification and T4 heat treatment on mechanical properties and corrosion resistance of an Al–9wtSi casting alloy’, Mater. Chem. Phys. , 2007, 106, 343–349.

10.

, Wang

H. W.

and Wei

Z. J.

: ‘Effect of yttrium on the solidification process and performance of Al7SiMg Alloy’, J. Wuhan Univ. Technol. , 2009, 24, 47–49.

11.

Liu

, Yu

F. X.

, Zhao

D. Z.

and Zuo

: ‘Microstructure and mechanical properties of an Al-12.5Si-0.7Mg alloy processed by extrusion and heat treatment’, Mater. Sci. Eng. A , 2011, A528, 3786–3790.

12.

Fox

and Campbell

: ‘Visualisation of oxide film defects during solidification of aluninium alloys’, Scr. Mater. , 2000, 43, 881–886.

13.

Campbell

: ‘Castings practice’; 2004, Oxford, UK, Butterworth Heinemann.

14.

Panigrahi

S. K.

and Jayaganthan

: ‘A study on the mechanical properties of cryorolled Al–Mg–Si alloy’, Mater. Sci. Eng. A , 2008, A80, 299–305.

15.

Ragab

K. A.

, Samuel

A. M.

, Al-ahmari

A. M. A.

and Samuel

F. H.

: ‘Influence of fluidized sand bed heat treatment on the performance of Al–Si cast alloys’, Mater. Des. , 2011, 32, 1177–1193.

16.

, Wang

H. W.

, Jie

J. C.

and Wei

: ‘Effects of yttrium and heat treatment on the microstructure and tensile properties of Al–7·5Si–0·5Mg alloy’, Mater. Des. , 2011, 32, 1617–1622.

Effect of heat treatment on Al–7Si–0·35Mg–2Cu cast alloys

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