| 1 | MICROSTRUCTURE ANALYSIS OF AN ION-NITRIDINGLAER ON A NO.45 STEEL显示文摘The cross-sectional microstructure of an ion-nitrided layer on a No.45 steel was studied by transmission electron microscopy (TEM). The results show that the columnar crystals constitute the compound layer. Most of them have the microstructure of alternating ε-Fe2-3N and γ-Fe4N and others are single ε-Fe2-3N phase. There are abnormal strip ferrites between the columnar crystals. The transition layer mainly consists of spherical γ-Fe4N and cementite (Fe3C) particles in the pearlite are dissolved in this layer. In diffusion layer, besides the equilibrium phase γ-Fe4N, there are α -Fe16N2 and the satellite spots around main spots of α-Fe16N2 demonstrate its modulation structure. A metastable ordered cluster zone of the nitropen atoms was found in the division layer. | X.L.Xu L.Wang Z.W.Yu Z.K.Hei | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，3： | 0 |
| 2 | ATRANSMISSION ELECTRONIC MICROSCOPY STUDY ONFORMATION AND MICROSTRUCTURE CHANGE OF Mg2Ni DURING MECHANICAL ALLOYING显示文摘The microstructuralchangeof mechanicalalloyingof pureelemental Mg Nipowders wasin vestigated by transmission electronic microscopy ( TEM). The experimental results showed thatafter5 h milling, Mg2 Ni phase precipitated mainly from Mg grain , and no Mg2 Ni wasfound in Ni matrix. Thiscan be attributed tothe asym metricalinterdiffusion between Mg and Ni atom , which causesthecontent of Mg in Ni grain far below thestoichiometric composition of Mg2 Ni. After the growth of Mg2 Ni grain, the severe mechanical deforma tion resulting from mechanicalalloying led tothetransformation of Mg2 Ni from hexagonal tofccstructure partially, which makes Mg2 Ni grain in a composite microstructure fcc + hcp. | S.J.Ji,Z.W.Yu ,J.C.Sun ,Z.K.Hei and L.Yan Institute of Metaland Technology,Dalian Maritime University ,Dalian 116026 ,China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，4： | 0 |
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