OBSERVATION ON PRECIPITATION ALONG GRAIN BOUNDARY IN Cu-Ni-Mn ALLOY
PAN Qihan;WANG Deming General Research Institute of Non-Ferrous Metals;Beijing
Cite this article:
PAN Qihan;WANG Deming General Research Institute of Non-Ferrous Metals;Beijing. OBSERVATION ON PRECIPITATION ALONG GRAIN BOUNDARY IN Cu-Ni-Mn ALLOY. Acta Metall Sin, 1985, 21(5): 51-55.
Abstract The effect of either the temperature and time of aging tests or the cold de-formation on the phase precipitated along grain boundaries in Cu-20Ni-20Mn alloywas investigated under TEM observation.The results showed that the aging tempe-rature influences the situation,shape and size of the nucleation of phase precipi-tated.At the aging temperature over 400℃,its preferred precipitation along grainboundary is retarded and the precipitated phase becomes fine and spheroidized.The cold deformation may also retard its preferred precipitation along grain boun-dary and change its distribution,shape and size.The increase of deformation mayimpel the precipitated phase to distribute within the grain more finely and homo-geneously.At all aging test temperatures except 500℃,the fcc solid solution de-composes and the precipitation is NiMn phase of fct structure with lattice constantα_0=0.364 and c_0=0.363 nm.