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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))_2SiO_4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~(-3)s~(-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。
In this paper, a high-precision Paterson gas medium deformation device was used to investigate the simple shear deformation of Fe-rich olivine aggregates (Mg_ (0.5), Fe_ (0.5)) _2SiO_4. The experiment was carried out at a temperature of 1473K and a confining pressure of 300MPa. The difference stress was 64 ~ 153MPa and the strain rate was 10 ~ (-5) ~ 10 ~ (-3) s ~ (-1). A total of three sets of tests were carried out, the shear deformation of the specimens were 89%, 131% and 200%, respectively. Reflecting optical microstructures of the specimens after deformation were used to obtain the dynamic recrystallization of the olivine olivine aggregates The microscopic mechanism shows the distribution of the optimal orientation and the wave velocity anisotropy of the crystal lattice and the evolution characteristics as the strain increases according to the analysis of the crystal anisotropy.