放电等离子体烧结镍的形变组织研究

利用放电等离子体烧结(SPS)技术制备了粗晶(13μm)和细晶(2μm)两种镍样品.EBSD分析表明,两种烧结样都没有织构,且它们的晶粒都为完全再结晶组织.对此烧结样进行单轴压缩,研究晶粒尺寸对形变中微观组织演变的影响.在样品坐标系中,用每个像素点相对于平均取向的旋转轴来构图,结果显示在一些大晶粒中有扩展的平直界面.滑...

Investigation of deformation microstructures in spark plasma sintered nickel

Coarse(13μ m)and fine(21μm)grained nickel samples were prepared by a spark plasma sintering method.Examination using electron backscatter diffraction(EBSD)showed that both samples were texture free and had a fully recrystallized grain structure.These samples were used to explore deformation microstructure formation as a function of grain size during uniaxial compression.Maps showing the rotation axis in the sample frame each pixel to the grain average revealed evidence of extended planar boundaries in some of the larger grains.A slip trace and Schmid factor analysis showed that that the orientation dependence of grains where extended planar boundaries were seen parallel to { 111 } traces was similar to that found in previous studies of larger grain sizes.In nearly all grains in both the coarse and fine grain samples clear evidence of grain subdivision during deformation was seen.