述评调和组织

Review harmonic structure

调和组织是以粉末颗粒表层的超细晶粒为壳层和粉末颗粒内部的粗晶为芯部,超细晶以连续三维网络包围粗晶的一种组织结构,藉以达到强化材料、改善延展性的双重目的。列举Ti合金、不锈钢、高速钢/低碳钢、钴基合金、纯Cu等为案例,描述其各自的制备技术及力学性能,并从起始粉末、粉末表层强力塑变、热致密化成形3方面,就这些制备调和组织的技术核心作了述评。

Harmonic structure consists of a powder particles surface with fine grains and particles core with coarse grains. The structure consists of a network- like fine grain region filled with islands of coarse grain region. The structure is demonstrated not only strengthen the material but also improve the ductility simultaneously. The harmonic structure and mechanical properties of titanium alloy,stainless steel,high speed steel/low carbon steel,cobalt based alloy and pure copper were analyzed. The key technical points for preparing the harmonic structure were reviewed,including initial powder,severe plastic deformation and hot consolidation.