大块结构 meaning in English

lumpy structure
massive structure

To obtain large bulk material with ultra - fine grain for the requirements of property measurement and engineering utilization , the transformation of friction press - torsion deformation zone was introduced in this paper . both the transmit of heat theory and the plastic mechanical theory were practiced to analyse the mechanical and deformation qualification
为了得到大块的超细晶结构材料，满足超细晶材料性能研究和工程应用的需要，本文提出了一种在大块结构材料内部得到超细晶的新方法? ?摩擦压扭强变形区转移法。