Abstract
Considerable anisotropy in the mechanical properties of quaternary Al-Li-Cu-Mg alloys was observed in both plate and sheet products. These alloys showed more than 100% increase in tensile ductility in the test direction oriented at 45–60° to the rolling direction as compared to that in the rolling direction (longitudinal, L). A concomitant decrease in strength was also found. These alloys exhibit superior low cycle fatigue resistance in the long-transverse (LT) direction as compared to the longitudinal (L) direction. Another observation is the occurrence of strength differential (S-D), which is seen to be directional. The trends in S-D are similar under monotonic as well as cyclic loading conditions. The fracture resistance is also highly anisotropic. An attempt is made here to correlate the observed anisotropy in the mechanical behaviour of these alloys with the microstructure and crystallographic texture.
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Baker C, Gregson P J, Harris S J and Peel C J (ed.) 1986 inAluminium-lithium alloys III (London: The Institute of Metals)
Behnood N and Evans J T 1989Acta Metall. 37 687
Chait R 1972Metall. Trans. 3 365
Coyne E J, Sanders T H and Starke E A 1981 inAluminium-lithium alloys, Proc. First Inter. Al-Li Conf., (Warrendale PA: The Metall. Soc. of AIME) p. 293
Dinsdale K, Noble B, Harris S J and Gregson P J 1988Mater. Sci. Engg. 101 75
Doorbar P J, Borradaile J B and Driver D 1986 inAluminium-lithium alloys III, (eds) C Baker, P J Gregson, S J Harris and C J Peel (London: The Institute of Metals) p. 496
Engler O and Lucke K 1991Mater. Sci. Engg. A148 15
Eswara Prasad N, Malakondaiah G, Raju K N and Rama Rao P 1989 inAdvances in fracture, Proc. Int. Conf. Fracture (ICF7) (eds) K Salama, K Ravi Chandar, D M R Taplin and P Rama Rao, Vol.2, p. 1103
Eswara Prasad N, Kamat S V and Malakondaiah G 1991 inAluminium strategies for the nineties and beyond, Proc. 2nd Int. Conf. Aluminium, (Incal 91) (eds) E S Dwarakadasa, S Seshan and K P Abraham (Bangalore: Aluminium Assoc. of India) p. 613
Eswara Prasad N, Malakondaiah G and Rama Rao P 1992Mater. Sci. Engg. A150 221
Forsyth P J E and Stubbington C A 1975Metals Technol. 2 158
Fox S, Flower H M and McDarmaid D S 1986 inAluminium alloys — their physical and mechanical properties, (eds) E A Starke and T H Sanders (Warly, UK: Engineering Materials Advisory Service) Vol. II, p. 939
Gregson P J and Flower H M 1985Acta Metall. 33 527
Gregson P J, McDarmaid D S and Hunt E 1988Mater. Sci. Technol. 4 713
Hirth J P and Cohen M 1969J. Matals 21 27A
Hirth J P and Cohen M 1970Matall. Trans. 1 3
Jata K V and Starke E A 1986Met. Trans. A17 1011
Kalish D and Cohen M 1969Trans. Am. Soc. Met. 62 353
Kamat S V and Eswara Prasad N 1990Scr. Metall. Mater. 24 1907
Khireddine D, Rahouadj R and Clavel M 1989Acta Metall. 37 191
Lee E W and Kim N J 1989 inAluminium-lithium alloys, Proc. 5th Int. Aluminium-lithium Conf., (eds) T H Sanders and E A Starke (Birmingham, UK: Materials & Components Engg. Pub. Ltd.) Vol. II, p. 809
Lee E W, Neu C E and Kazol J 1990J. Metals 42 11
Leslie W C and Sober R J 1967Trans. Am. Soc. Met. 60 459
Lynch S P 1991Mater. Sci. Engg. A136 25, 45
Olsen R J and Ansell G S 1969Trans. Am. Soc. Met. 62 711
Palmer I G, Miller W S, Lloyd D J and Bull M J 1986 inAluminium-lithium alloys III (eds) C Baker, P J Gregson, S J Harris and C J Peel (London: The Institute of Metals) p. 565
Peel C J, Evans B and McDarmaid D 1986 inAluminium-lithium alloys III (eds) C Baker, P J Gregson, S J Harris and C J Peel (London: The Institute of Metals) p. 26
Peel C J, Evans B and McDarmaid D J 1987Metals Mater. 3 449
Peters M, Welpmann K and Sanders T H 1985 inProc. 3rd Conf. E-MRS on advanced materials R & D for transport, Strasbourg
Peters M, Eschweiler J and Welpmann K 1986aScr. Metall. 20 259
Peters M, Welpmann K, Zink W and Sanders T H 1986b inAluminium-lithium alloys III (eds) C Baker, P J Gregson, S J Harris and C J Peel (London: The Institute of Metals) p. 239
Roven H J, Starke E A, Sodahl O and Hjelen J 1990Scr. Metall. Mater. 24 421
Smith A F 1987J. Phys. (Paris) 48 C3–629
Srivatsan T S 1988Inter. J. Fatigue 10 91
Srivatsan T S and Coyne E J 1986aInter. J. Fatigue 8 201
Srivatsan T S and Coyne E J 1988b inConf. Proc. Int. Sym. for testing and fracture analysis, (Metal Park, Ohio: ASM Inter.) p. 281
Srivatsan T S and Coyne E J 1989Mater. Sci. Technol. 5 548
Takahashi K, Manakawa K and Ouchi C 1987J. Phys. (Paris) 48 C3–163
Tempus G, Calles W and Scharf G 1991Mater. Sci. Technol. 7 937
Venkateswara Rao K T and Ritchie R O 1988Mater. Sci. Technol. 5 882
Welpmann K, Peters M and Sanders T H 1984Aluminium 60 735, 846
Wilson D V 1975Metals Technol. 2 8
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Eswara Prasad, N., Malakondaiah, G. Anisotropy of mechanical properties in quaternary Al-Li-Cu-Mg alloys. Bull. Mater. Sci. 15, 297–310 (1992). https://doi.org/10.1007/BF02747639
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DOI: https://doi.org/10.1007/BF02747639