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| OBSERVATION ON PRECIPITATION ALONG GRAIN BOUNDARY IN Cu-Ni-Mn ALLOY |
| PAN Qihan;WANG Deming General Research Institute of Non-Ferrous Metals;Beijing |
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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.
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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.
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Received: 18 May 1985
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1 Stanley,S.P.,U.S.Pat.3 712 837,(1971) .
2 Groma,G.,Proc.of the 4th Conf.on Dimensioning and Strength Calculation,Hungarlan Academy of Sciences,Budapes,Oct.,1971,Akademiai Kiado,Budapest,1973,p.417．
3 Bevet,H.,Pro-Metal,26(1973) ,№138,f-II,p.10．
4 Stanley,S.P.;Dereke,T.;Richard,L.N.,Metall.Trans.,5(1974) ,№11,2457．
5 三木雅道;掘芪德,日本金属学会志,46(1982) ,301．U |
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