Microstructural changes occurring during the sintering of molybdenum compacts containing minor additions of nickel were compared with changes during the creep of thin molybdenum foils in the presence of nickel vapour. Evidence from micro-structural, shrinkage, and creep rate studies indicates that there exist three stages of sintering: an intrinsic stage during heating, in which the dislocation structure caused by cold compaction is still maintained; a transient stage, in which recovery and recrystallization occur; and a post-recrystallization stage, in which grain boundary diffusion is the dominant shrinkage mechanism. PM/0353
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References
1.
ExnerH. E. and PETZOWG.: in ‘Materials science research’, Vol. 13, ‘Sintering processes’, (ed. Kuczynski)G. C., 107; 1980, New York, Plenum.
2.
PejovnikS., SMOLEJV., SUSNIKD., and KOLARD.: Powder Metall. Int., 1979, 11, 22.
3.
SeeligR. P. and WULFFJ.: Trans. AIME, 1946, 166, 492.
4.
CobleR. L. and BURKEJ. E.: in ‘Progress in ceramic science’, (ed. Burke)J. E., Vol. 3, 197-251; 1973, New York, Macmillan.
5.
UematsuK..: in Proc. Int. Symp. on ‘Factors in densification and sintering of oxide and non-oxide ceramics’, Hakone, Japan, 1978, (ed. S. Saito and S. Somiya), 190.
6.
KuczYNsfuG. C.: in ‘Materials science research’, Vol. 13, ‘Sintering processes’, (ed. Kuczynski)G. C., 39; 1980, New York, Plenum.
7.
BrookR. J.: J. Am. Ceram. Soc., 1969, 52, 56.
8.
ExnerH. E. and BROSSP.: Ada Metall., 1979, 27, 1007.
9.
CobleR. L.: J. Appl. Phys., 1963, 34, 1679.
10.
Hofmann-AmtenbrinkM.: thesis, University of Berlin, 1985.
11.
LeeJ. S., KAYSSERW. A., and PETZOWG.: in ‘Modern developments in powder metallurgy’, Vol. 15; 1985, Princeton, NJ, Metal Powder Industries Federation, in press.
12.
LeibrandtM. and RUTKOWSKIW.: Planseeberichte, 1977, 25, 3.
KaysserW. A., AMTENBRINKM., and PETZOWG.: in ‘Sintering — theory and practice’, (ed. KolarD.), Materials Science Monographs 14, 275; 1982, Amsterdam, Elsevier.
16.
KaysserW. A., HOFMANN-AMTENBRINKM., and PETZOWG.: in Proc. 6th European Symp. ‘PM ‘82’, Florence, June 1982, Associazione Italiana di Metallurgia, Paper 17.
17.
DavisL. E., MacDONALDN. C., PALMBERGR. W., and WEBERR. E.: ‘Handbook of AES’; 1976, Eden Prairie, Minn., Physical Electronics Industries.
18.
HofmannH. and HOFMANNS.: Ser. Metall., 1984, 18, 77.
