摘要
通过恒位移速度压缩试验研究了不同晶粒大小、不同致密度的3Y-TZP的高温塑性流动行为结果表明,塑性流动应力随着温度和应变速率的提高及晶粒尺寸的增大而提高,随着气孔率的增大而下降对于晶粒较粗的试样,当应力水平较高时,由于材料内部产生孔穴化,引起屈服后流动应力下降细晶 3Y-TZP在高温塑性形变过程中产生应变硬化。
The high temperature plastic flow behavior of 3Y-TZP with different grain sizes and different densities was studied by compression tests at constant speed. The plastic flow stress increased with increasing temperature, strain rate and grain size, decreased with the increase of porosity. At high enough stress level, the flow stress decreased after yielding for the coarser-grained specimens due to internal cavitation. Strain hardening occurred for the fine-grained 3Y-TZP because of the dynamic grain growth and the increase of strain rate during high temperature plastic flow.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2000年第1期104-108,共5页
Chinese Journal of Materials Research
关键词
氧化锆
塑性流动
应变硬化
形变
超塑性陶瓷
zirconia. plastic flow, strain hardening, superplasticity, deformation