论文部分内容阅读
对(Mg,Ni)_2GeO_4尖晶石-橄榄石集合体进行了高温高压扭转大变形实验研究。试验在一台高分辨率的气体介质试验机上进行,试验温度为1473K,围压为300MPa,应变率为10~(-4)～10~(-5)S~(-1),剪切应力为80～250MPa,剪切应变为30％～700％。将变形后试件沿轴向切开进行了显微结构分析,确定了两相成分的比值。利用EBSD方法分别对变形前后试件中的橄榄石和尖晶石中的晶格最优取向(LPO)进行了测定,由微结构的差异确定了变形机制及两相材料的相对强度。
The (Mg, Ni) _2GeO_4 spinel-olivine aggregate was subjected to large deformation under high temperature and high pressure. The test was carried out on a high-resolution gas medium testing machine with a test temperature of 1473K, a confining pressure of 300MPa, a strain rate of 10 -4 to 10 -5 S -1, a shear stress 80 ~ 250MPa, shear strain is 30% ~ 700%. After the deformation of the specimen along the axial incision microstructure analysis to determine the ratio of two-phase composition. The optimal orientation (LPO) of olivine and spinel in the specimens before and after deformation was measured by EBSD method. The deformation mechanism and the relative intensity of the two-phase material were determined by the difference of microstructure.