A TEM investigation was made on the morphology,orientation relationship and habit plane of three alloy nitrides,namely CrN,VN and Mo_2N simultaneously formed within the diffussional nitrided layers in an H13 steel nit...A TEM investigation was made on the morphology,orientation relationship and habit plane of three alloy nitrides,namely CrN,VN and Mo_2N simultaneously formed within the diffussional nitrided layers in an H13 steel nitrided at 580℃.It was.found that the nitrides were precipitated by continuous clustering and subsequent ordering of both interstitial(N)and substitutional(Cr,V,Mo)solutes on {001} habit plane,and that the observed morphology and crystallography of the nitrides were in good agreement with the predictions from the invariant line stain model proposed for precipitation transformations.展开更多
Treatment of tricarbonyl cyclopentadienyl metal (molybdenum or tungsten) chloride with equal molar amounts of tricarbonyl nitrosyl iron sodium at room temperature yielded the following complexes: orange (η5-C5H5)M(CO...Treatment of tricarbonyl cyclopentadienyl metal (molybdenum or tungsten) chloride with equal molar amounts of tricarbonyl nitrosyl iron sodium at room temperature yielded the following complexes: orange (η5-C5H5)M(CO)2NO, violet [(η5-C5H5)M(CO)3]2 and black (η5-C5H5)M(μ3-NH)(μ2-NO)(μ2-CO)Fe2(CO)6. These were separated and purified by column chromatography. The last black complexes have a new cluster-type structure with a face-bridging imido(μ3-NH) ligand which was obtained by reducing the nitrosyl (NO) group. In this paper, synthesis and characterization of the title complexes are reported along with their crystal structures which are of two types.展开更多
文摘A TEM investigation was made on the morphology,orientation relationship and habit plane of three alloy nitrides,namely CrN,VN and Mo_2N simultaneously formed within the diffussional nitrided layers in an H13 steel nitrided at 580℃.It was.found that the nitrides were precipitated by continuous clustering and subsequent ordering of both interstitial(N)and substitutional(Cr,V,Mo)solutes on {001} habit plane,and that the observed morphology and crystallography of the nitrides were in good agreement with the predictions from the invariant line stain model proposed for precipitation transformations.
文摘Treatment of tricarbonyl cyclopentadienyl metal (molybdenum or tungsten) chloride with equal molar amounts of tricarbonyl nitrosyl iron sodium at room temperature yielded the following complexes: orange (η5-C5H5)M(CO)2NO, violet [(η5-C5H5)M(CO)3]2 and black (η5-C5H5)M(μ3-NH)(μ2-NO)(μ2-CO)Fe2(CO)6. These were separated and purified by column chromatography. The last black complexes have a new cluster-type structure with a face-bridging imido(μ3-NH) ligand which was obtained by reducing the nitrosyl (NO) group. In this paper, synthesis and characterization of the title complexes are reported along with their crystal structures which are of two types.