摘要
对(Mgx,Ni1-x)2GeO4橄榄石尖晶石两相混合物进行了剪切变形实验.实验在Paterson内伺服控制气体介质试验机中进行,围压为400 MPa,温度为T=1473 K,应变率在10-4到10-5之间.剪切实验所用试件分为两种,一种试件为单层同结构比,其化学成分为(Mg0.9, Ni0.1)2GeO4,橄榄石和尖晶石的比例为77:23.另一种是两层不同结构比试件,其化学组成分别为(Mg0.9,Ni0.1)2GeO4和(Mg0.8, Ni0.2)2GeO4,试件中橄榄石和尖晶石的比例分别为75:25和26:74.在单层同结构比试件的剪切变形实验中观测到,仅70％的总剪切变形就产生了很强的剪切带;而在两层介质的剪切试验中则观测到:一个小的化学成分的改变(10％),引起了大的相成分的改变(78％),同时产生了更大的剪切应变的差别(145％)。
The rheological behavior of the olivine-spinel two-phase mixtures of the system (Mgx,Ni1-x)2 GeO4 has been studied. The experiments were made at P = 400 MPa confining pressure and T =1473 K at constant load in a gas-medium apparatus with the strain rate ranging from 10-5 to 10-4. Two types of samples are used in the experiments. One is (Mg0.9, Ni0.2)2GeO4 with the olivine-spinel ratio 77:23. Another is a two layer sample with the chemical composition of (Mg0.9, Ni0.2)2GeO4 and (Mg0.9, Ni0.2)2GeO4 in each layer, respectively. While the olivine-spinel ratio is 75:25 and 26:74 in each layer, respectively. The test results show that with only 70% shear deformation, the intensive shear band was observed in the single layer shear deformation experiment and that with a small chemical composition difference (10%), the large phase difference (78%) as well as the huge strain difference (145%) was obtained in the two layer shear deformation experiment.
出处
《力学学报》
EI
CSCD
北大核心
2003年第3期348-352,共5页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金资助项目(40174028
10032040-1)
美国NSF(EAR-9805217)资助项目
关键词
橄揽石
两相介质
剪切变形
实验研究
尖晶石
olivine, spinel, two phase mixture, rheology, experimental studies
