摘要
提出了超塑性形变机制的”Ｙ型晶粒粘性挤人模型”．认为依靠晶内滑移和晶界原子较长距离的扩散，使晶界变成流态化区，创造了晶态材料产生粘性、品字形分布的晶粒在流态化区发生滑动，通过相互挤入，使拉伸应力方向上的晶粒数目不断增大而实现无缩颈，异常大的均匀延伸．
According to the expenriment results .The anter Proposes the mechanism of Superplatic deformation'Y─ type grain boundary viscous squeezing model',and it was considered that superplastic deformation of metallic materials is a vis cous deforming process of the fluidized -zone of grain boundary. This fluidized ─ zone of grain boundary in crystalling materials is caused by the plaastic deformation of grains and grain boundaries as wall as the diffusion of atoms. if is a assential prerequiste for Producing the superplasticity that all or most of grain boundaries become the fluidized ─ zone, no ─ necking, unusual and uniform elongation results form plastic deformtion induced viscoms deformation of grain boundary. Superplasticity obtained in metalic materials become great with enhancing viscous? deformation of grain boundary.
出处
《湘潭大学自然科学学报》
CAS
CSCD
1996年第2期100-105,共6页
Natural Science Journal of Xiangtan University
关键词
超塑性
形变机制
组织变化
粘性变形
金属材料
superplasticity, superplastic deformation mechanism, microstructure viscous defor-mation.
