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Rheology of grain-boundary sliding and grain interlocking

晶界滑动和晶粒互锁的流变学

基本信息

批准号：
09450243
负责人：
SAKAI Mototsugu
金额：
$ 6.85万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

(1) A novel rheological test system which operates at high temperatures (ranging from 500 to 1300 degree centigrade) was designed and constructed.(2) Theoretical considerations and quantitative derivations were made for the viscoelastic constitutive equations of polycrystals with grain-boundary melt-phase in various types of multiaxial stress/strain fields. The equations include the elastic deformation of respective polycrystalline grains, as well as viscous flow of melt-phase in grain channels.(3) A novel microstructural model for the superplastic deformation of refractory grain aggregates was proposed. The importance of cooperative motions of groups of grains in an aggregate was emphasized to be essential for including a large-scale deformation under tension/compression. An important theoretical prediction for a size-effect law in superplastic deformation was made.(4) Various types of rheological test were conducted by the use of ZrO2-ceramics, and the test results were related to the microscopic processes and mechanisms of grain-boundary Zener-relaxation, grain interlocking, cooperative grain-boundary sliding.(5) Time-dependent viscoelastic surface deformation produced by a pyramidal indentation was theoretically examined to derive a constitutive equation for a microscopic surface contact.(6) A novel indentation test system that operates at elevated temperatures (from 300 to 1500 degree centigrade) was designed, constructed, and applied to rheologically testing various types of inorganic glasses above their glass transition points.

(1)设计并搭建了一套新型的高温(500~1300℃)流变学测试系统。(2)对具有晶界熔体的多晶体在不同类型的多轴应力应变场中的粘弹性本构方程进行了理论推导和定量推导。这些方程包含了各多晶颗粒的弹性变形以及熔体在颗粒通道中的粘性流动。(3)提出了一种新的耐火颗粒集合体超塑性变形的微观结构模型。强调集合体中颗粒群的协同运动对于包括在拉伸/压缩下的大范围变形至关重要。对超塑性变形中的尺寸效应规律进行了重要的理论预测。(4)利用氧化锆陶瓷进行了各种类型的流变试验，试验结果与晶界齐纳松弛、晶界互锁、晶界协同滑动的微观过程和机制有关。(5)从理论上研究了锥形压痕产生的随时间变化的粘弹性表面变形，推导了微观表面接触的本构方程。(6)设计、建造了一种新型的高温(300-1500℃)压痕试验系统，并适用于各种类型的无机玻璃在玻璃化转变点以上的流变性测试。