超大塑性变形的研究进展—纳米材料的晶粒细化机制(二)  

Review and Prospect of Severe Plastic Deformation—Grain Refinement Mechanism of Bulk Nano-crystalline Materials(continued)

作　　者：杨钢[1] 张凌义[1] 王立民[1] 

机构地区：[1]钢铁研究总院,北京100081

出　　处：《特钢技术》2008年第2期1-9,共9页Special Steel Technology

摘　　要：超大塑性变形下的晶粒细化机制与材料的层错能有很大的关系,对中、高层错能材料,主要是位错分割机制,可获得的最小晶粒尺寸一般只有几百纳米(超细晶);对低层错能材料,形变孪生和马氏体相变在晶粒细化过程中起非常重要的作用,可获得小于100nm的晶粒。Stacking fault energy has great effect on mechanism of grain refmement in the condition of severe plastic deformation, in the material of medium and high stacking fault energy, dislocation division is the main mechanism of grain refinement, and the obtainable minimum grain size is several hundreds nanometer（super grain- refining）. While in the material of low stacking fault energy, deforming twins and martensitic transformation play a very important role in grain refinement , and grain size of smaller than lOOnm can be obtained.

关 键 词：超大塑性变形 晶粒细化机制 晶粒尺寸 

分 类 号：TB383.1[一般工业技术—材料科学与工程]