【摘要】 本文利用高精度Paterson气体介质变形装置对富铁橄榄石集合体(Mg_0.5,Fe_0.5)₂SiO₄进行了高温简单剪切变形试验。试验在温度1473K和围压300MPa的条件下进行,差应力为64～153MPa,应变率为10^-5～10^-3s^-1。一共进行了三组试验,试件的剪切变形量分别为89%,131%和200%,通过对变形后试件的反射光学显微结构分析,得到富铁橄榄石集合体动态重结晶的微观机制,由结晶各向异性分析给出晶格最优取向和波速各向异性的分布及随应变的增加而表现出的演化特征。更多还原

【Abstract】 Simple shear creep deformation experiments were performed using high resolution gas media apparatus on fine-grained samples of (Mg_0.5 , Fe_0.5)₂SiO₄ at a temperature of 1473 K and a confining pressure of 300 MPa. Differential stresses in the range of 64 to 153 MPa resulted in strain rates between 10^-5～10^-3s^-1. Three samples were deformed to the shear strain of 89% , 131% and 200% , respectively. From the micro-structural analysis, grain size distribution, lattice preferred orientation, the seismic anisotropy characteristics as well as their changes with the strain were investigated.更多还原