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)设计并构建了一种新型的高温(500~1300℃)流变测试系统。(2)对晶界熔体多晶粘弹性本构方程进行了理论思考和定量推导。各种类型的多轴应力/应变场中的相。该方程包括各个多晶颗粒的弹性变形以及颗粒通道中熔体相的粘性流动。(3)提出了一种新的耐火颗粒聚集体超塑性变形的微观结构模型。强调了聚集体中颗粒群协同运动的重要性，这对于包括拉伸/压缩下的大规模变形至关重要。对超塑性变形的尺寸效应规律做出了重要的理论预测。(4)利用ZrO2陶瓷进行了各类流变试验，试验结果与晶界的微观过程和机制有关。齐纳弛豫、晶粒互锁、协同晶界滑动。(5) 从理论上检验了金字塔压痕产生的随时间变化的粘弹性表面变形，推导出微观表面的本构方程(6)设计、构建了一种在高温（300至1500摄氏度）下运行的新型压痕测试系统，并将其应用于高于其玻璃化转变点的各种类型的无机玻璃的流变测试。