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利用垂直悬浮区域电子束熔炼炉,先制取单晶体,然后再制取双晶体。为了制取具有对称倾斜晶界的双晶体,根据晶界角度(即双晶的取向差)范围的不同,Y型种子法被用来制取具有小角度晶界(即取向差θ<20°)的双晶体;而匹配种子法则用以制取大角度的双晶体。为了制取具有扭转晶界的双晶体,采用了单晶体切割旋转法。应用上述技术,制取到不同晶界角度的体心立方结构(bcc)的双晶体,可系统地研究晶界腐蚀、晶界硬化、晶界断裂、晶界偏析、晶界沉淀、晶界扩散和晶界迁移等七种主要晶界现象以及它们与晶界构造本质的关系。
Using a vertical suspension electron beam furnace, a single crystal is prepared and then a double crystal is taken. In order to make dual crystals with symmetrically inclined grain boundaries, the Y-type seed method is used to make grains with small angle grain boundaries (ie, orientation difference θ <20 °, depending on the range of grain boundary angles (ie, twin orientation difference) ) Double crystal; and match the law of the seeds used to make wide angle double crystals. In order to prepare twin crystals with a twisted grain boundary, a single crystal cutting rotation method was used. Applying the above technique, bcc crystals with different grain boundary angles can be obtained to systematically study grain boundary corrosion, grain boundary hardening, grain boundary fracture, grain boundary segregation, grain boundary precipitation and grain boundary diffusion And the grain boundary migration and other seven kinds of grain boundary phenomena and their relationship with the nature of the grain boundary structure.