Cu-15Ni-8Sn-0.3Nb alloy rods were prepared by means of powder metallurgy followed by hot extrusion.Element maps obtained by electron probe micro analyzer(EPMA)showed that Nb-rich phases were formed and distributed wit...Cu-15Ni-8Sn-0.3Nb alloy rods were prepared by means of powder metallurgy followed by hot extrusion.Element maps obtained by electron probe micro analyzer(EPMA)showed that Nb-rich phases were formed and distributed within grains and at grain boundaries of the Cu-15Ni-8Sn-0.3Nb alloy.Transmission electron microscope(TEM)results indicated that there was no obvious orientation relationship between these phases and the matrix.Spinodal decomposition and ordering transformation appeared at early stages of aging at400°C and caused significant strengthening.Cu-15Ni-8Sn-0.3Nb alloy exhibited both higher strength(ultimate tensile strength>1030MPa)and higher tensile ductility(elongation>9.1%)than Cu-15Ni-8Sn alloy after aging treatment.The improvement was caused by Nb-rich phases at grain boundaries which led o the refinement of grain size and postponed the growth of discontinuous precipitates during aging.展开更多
By means of the measurement of mechnical properties and resistivity and X-ray diffraction and transmission microscopy,the effect of cold deformation on the kinetics of spinodal decomposition of Cu-9Ni-6Sn-0.3Ce alloy ...By means of the measurement of mechnical properties and resistivity and X-ray diffraction and transmission microscopy,the effect of cold deformation on the kinetics of spinodal decomposition of Cu-9Ni-6Sn-0.3Ce alloy was studied.The strengthening process of the cold-worked and aged alloy was found to be accelerated.Using the theory of dislocation,the strengthening in cold-worked alloy can be attributed to the acceleration of spinodal process.展开更多
基金Project (2016YFB0301400) supported by the National Key Research and Development Program of ChinaProject (9140A12040515QT48167) supported by the Pre-research Fund of the General Armaments Department of ChinaProject (CSU20151024) supported by the Innovation-driven Plan of Central South University,China
文摘Cu-15Ni-8Sn-0.3Nb alloy rods were prepared by means of powder metallurgy followed by hot extrusion.Element maps obtained by electron probe micro analyzer(EPMA)showed that Nb-rich phases were formed and distributed within grains and at grain boundaries of the Cu-15Ni-8Sn-0.3Nb alloy.Transmission electron microscope(TEM)results indicated that there was no obvious orientation relationship between these phases and the matrix.Spinodal decomposition and ordering transformation appeared at early stages of aging at400°C and caused significant strengthening.Cu-15Ni-8Sn-0.3Nb alloy exhibited both higher strength(ultimate tensile strength>1030MPa)and higher tensile ductility(elongation>9.1%)than Cu-15Ni-8Sn alloy after aging treatment.The improvement was caused by Nb-rich phases at grain boundaries which led o the refinement of grain size and postponed the growth of discontinuous precipitates during aging.
文摘By means of the measurement of mechnical properties and resistivity and X-ray diffraction and transmission microscopy,the effect of cold deformation on the kinetics of spinodal decomposition of Cu-9Ni-6Sn-0.3Ce alloy was studied.The strengthening process of the cold-worked and aged alloy was found to be accelerated.Using the theory of dislocation,the strengthening in cold-worked alloy can be attributed to the acceleration of spinodal process.
