Using electron microscope, we observde the structure of powder particle with gross dendrites and equiaxed grains.Ths topography, arrangement, size of dendrites changed with composition.

• 通过电镜观察到粉末颗粒具有粗大树枝晶和等轴晶组织,枝晶的形貌、排列、尺寸随成分的不同而改变。