Production of Ultrafine Grained Structural Metallic Materials by Means of Severe Warm Rolling

对金属结构材料的超晶粒细化进行了研究。提出了一种适用于大体积材料连续生产的强塑性变形新工艺——累积滚粘接（ARB）。将ARB工艺应用于各种铝合金、钢和铜合金，均成功获得了平均晶粒尺寸为数百纳米的超细晶组织。与初始材料相比，超细颗粒材料具有很高的强度。阐明了超细晶粒在剧烈塑性变形过程中的形成机理。

Ultra-grain refinement of structural metallic materials was studied. A novel severe plastic deformation process applicable to continuous production of large bulky materials, Accumulative Roll-Bonding (ARB) was developed. The ARB process was applied to various kinds of aluminum alloys, steels and copper alloys, and ultrafine grained structure with mean grain sizes of several hundreds nano-meters was successfully obtained in all the materials. The ultrafine grained materials performed very high strength compared with the starting materials. The formation mechanism of the ultrafine grains during severe plastic deformation was clarified.