Techniques and equipment were developed for the extrusion of vapour deposited RAE Alloy 72. The alloy was extruded at temperatures from 300 to 420°C and extrusion ratios from 2:1 to 25:1. Room and elevated temperature strengths and smooth S–N (stress–number of cycles to failure) fatigue properties were determined for a range of extrusions. The best extrusions gave room and elevated temperature strengths that were comparable to those of rapidly solidified aluminium alloys. The fatigue strength/tensile strength ratio of >0·5 was higher than would be expected for an aluminium alloy.
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References
1.
BICKERDIICER. L., CLARKD., HUGHESG., McCONNELLM. C., MAIRW. N., PARTRIDGEP. G., and VINEYB. W.: ‘Preparation and properties of evaporated alloys deposited on a reciprocating collector’, Technical Report 85034, Royal Aerospace Establish-ment, Farnborough, 1985.
2.
BICKERDIKER. L., CLARKD., EASTABROOKJ. N., HUGHESG., MAIRW. N., PARTRIDGEP. G., and RANSONH. C.: Int. J. Rapid Solidification, 1986, 2, 1–19.
3.
GARDINERR. W. and McCONNELLM. C.: Met. Mater.,1987, 3, 254–258.
4.
McCONNELLM. C., CLARKD., and GILMOREC. J.: ‘The rolling of evaporated Al—Cr—Fe alloys’, Technical Report 83074, Royal Aerospace Establishment, Farnborough, 1983.
5.
PARTRIDGEP. G. and CLARKD.: ‘The effect of upsetting and extrusion on the tensile properties and toughness of an evaporated Al—Cr—Fe alloy’, Technical Memorandum MAT/246, Royal Aerospace Establishment, Farnborough, 1976.
6.
McCONNELLM. C. and PARTRIDGEP. G.: Acta Metall.,1987, 35, 1973–1980.
7.
McCONNELLM. C.: Unpublished work, Royal Aerospace Estab-lishment, Farnborough, 1982.
8.
SHOLLOCKB. A.: ‘Precipitation in rapidly solidified aluminium—chromium—iron alloys’, PhD thesis, University of Oxford, 1989.
9.
PARTRIDGEP. G. and McCONNELLM. C.: Acta Metall.,1987, 35, 1981–1993.
10.
DUNKLEYJ. J. and CAUSTONR. J.: Powder Metall. Int.,1976, 8, 115–117.
11.
SAKATAI. E: ‘System study of transport aircraft incorporating advanced aluminium alloys (Final Report)’, Report NASA-CR-165820, NASA, Burbank, CA, 1982.
12.
PETRAKG. J. and MALUSM. A.: ‘The mechanical property database fora cooperative program on first generation PM aluminium alloys (Final Report)’, Report AFWAL-TR-85-4052, Air Force Wright Aeronautical Laboratory, Dayton, OH, 1985.
13.
FADESF. H. and PICKENSJ. R.: J. Met.,1984, 36, (1), 14–28.
14.
FROESE H., KIMY.-W., and HEHMANNF.: J. Met.,1987, 39, (8), 14–21.
15.
‘High temperature aluminium alloys’, Data sheets, Allied-Signal Inc., Morristown, NJ, 1988.
16.
CASSIDYP. D.: The room and elevated temperature tensile properties and microstructure of high temperature aluminium alloys FVS0812 and FVS1212’, Technical Memorandum MAT/ STR 1135, Royal Aerospace Establishment, Farnborough, 1989.
17.
PALMERI. G. and THOMASM. P.: Metall, 1987, 41, 600–605.
18.
MILLERW. S., HUGHESI. R., PALMERI. G., THOMASM. P., SAINIT. S., and WHITEJ.: M‘High strength powder metallurgy aluminium alloys II’; (ed. HildemanG. J. and KoczakM. J.), 311-331; 1986, Warrendale, PA, TMS Publications.
LUTJERINGG., DölCERH., and MUNZD.: in ‘The microstructure and design of alloys’ (Proc. 3rd Int. Conf. on ‘Strength of metals and alloys’), 1, 427-431; 1973, London, The Institute of Metals.
