Dispersoid strengthening of Al–Cu–Mg P/M alloy utilising transition metal additions

Abstract The objective of this research was to devise a means by which dispersoid forming transition metals could be incorporated into press and sinter aluminium powder metallurgy (P/M) alloys. Additions of iron and nickel were explored in this context added as either admixed elemental powders or prealloyed additions into the base aluminium powder. Utilising an Al–2·3Cu–1·6Mg–0·2Sn composition as the base system, elemental additions imparted coarse aluminide phases within the sintered microstructure and diminished the general sintering response of the alloy. The resultant tensile properties of these materials were inferior to those of the unmodified base alloy. Prealloying was much more effective. Using this approach, highly refined distributions of aluminides were achieved without any adverse effects on the compaction or sintering response of the base alloy. A prealloyed addition of 1 wt-% iron was the most effective of those considered as it imparted tangible gains in yield strength and ultimate tensile strength (UTS) to the base alloy.

[1]  Qian Zhang,et al.  The diffraction patterns from β″ precipitates in 12 orientations in Al–Mg–Si alloy , 2010 .

[2]  W. Feng,et al.  Microstructural characterization of an Al–Cu–Mg alloy containing Fe and Ni , 2009 .

[3]  D. Heard,et al.  Metallurgical assessment of a hypereutectic aluminum–silicon P/M alloy , 2009 .

[4]  D. P. Bishop,et al.  Metallurgical assessment of an emerging Al–Zn–Mg–Cu P/M alloy , 2009 .

[5]  Z. Bojar,et al.  EXOTHERMIC REACTIONS DURING THE SINTERING OF ELEMENTAL IRON-AND-ALUMINUM POWDER MIXES , 2009 .

[6]  K. Dunnett,et al.  Development of Al–Ni–Mg–(Cu) aluminum P/M alloys , 2008 .

[7]  I. Macaskill,et al.  Reaction sintering of intermetallic-reinforced composite materials , 2007 .

[8]  P. Bassani,et al.  Calorimetric analyses on aged Al–4.4Cu–0.5Mg–0.9Si–0.8Mn alloy (AA2014 grade) , 2007 .

[9]  I. Macaskill,et al.  On development of press and sinter Al–Ni–Mg powder metallurgy alloys , 2006 .

[10]  D. Kent,et al.  Age hardening of a sintered Al–Cu–Mg–Si–(Sn) alloy , 2005 .

[11]  D. B. Goel,et al.  Influence of thermomechanical aging on fatigue behaviour of 2014 Al-alloy , 2005 .

[12]  T. Sanders,et al.  The effect of iron and manganese on the recrystallization behavior of hotrolled and solution-heat-treated aluminum alloy 6013 , 1996 .

[13]  T. N. Baker,et al.  Microstructure of Al–Fe alloys sintered via in situ microfusion process , 1993 .

[14]  Fritz Aldinger,et al.  Ternary Alloys: A Comprehensive Compendium of Evaluated Constitutional Data and Phase Diagrams , 1989 .

[15]  J. Hatch,et al.  Aluminum: Properties and Physical Metallurgy , 1984 .

[16]  D. Lloyd,et al.  A calorimetric study of aluminium alloy AA-7075 , 1982 .

[17]  R. Deiasi,et al.  Calorimetric studies of 7000 series aluminum alloys: II. Comparison of 7075, 7050 and RX720 alloys , 1977 .