石英单晶滑移系可动性与主应力(σ_1)取向的关系

RELATIONSHIP BETWEEN MOBILITY OF QUARTZ CRYSTAL SLIP SYSTEM AND ORIENTATION OF PRINCIPAL STRESS(σ1)

本文通过一组c轴与主应力(σ_1)夹角ψ不同的人工合成石英单晶体定向样品的实验变形,研究了主应力取向对石英晶体滑移系开动的影响。研究表明,主应力取向对石英晶体滑移系的可动性有明显影响:在450—650℃温度,300—500MPa围压条件下,当ψ=0°时,石英滑移系不开动;ψ=90°时,(001)[100]、(011)[111]等底面或锥面的滑移系有微小动作;ψ=45°时,石英晶体滑移系可动性最好。在这种温度压力条件下,石英晶体的位错沿开动的滑移系运动是石英产生塑性变形的直接原因。

The influence of principal stress orientation on the mobility of the quartz crystal slip system has been studied by high temperature and high pressure deformation test, in which the angle 'φ' between the 'c' axis of quartz crystal and the principal stress 'σ_1' orientation is variable.The research results show that all the quartz crystal sllp systems are inactive when φ=0° but become active when φ=90°. The sllp systems of quartz crystals become more active when φ=45°. That means temperature and pressure are necessary preconditions for slip system mobility of quartz crystals. But they will not be active unless the orientation of principal stress is suitable for those slip systems.