本文用晶体区熔生长理论对激光加热基座法生长的单晶光纤形状稳定问题作了研究。
In the paper, the shape stability of single crystal fibers grown by laser heating float zone growth method is studied with zone melt growth theory.
对重熔区显微组织进行了研究，研究表明：激光重熔区分为熔凝区、过渡区及热影响区；
The result of microstructures analysis show: there are melted zone , transient zone and heat affected zone in the laser melted layer.
讨论了激光熔区的凝固特征及成分与激光熔区的平均显微硬度的关系。
The solidification phenomena of the laser melted zone and the relationship between the composition and average microhardness of the laser melted zone were discussed.
结果表明，激光处理后试样表面熔凝区的组织主要为胞状枝晶组织，经后续热处理可转变为细小的等轴晶粒组织，并形成了良好的超塑连接条件。
The results show that, after laser surface processing, a melt layer with cellular-dendrite structure is formed, which could transform into very fine-grained structure during the annealing treatment.
结果表明，激光熔覆层在微观结构上存在熔覆区、结合区、基体热影响区三个区域。
The results show that microstructure of clad layers comprises three zones as cladding, bonding and heat-affecting zone.
激光熔覆区的显微硬度约为基体的10倍。
The microhardness of the cladding zone is 10 times of the substrate.
激光熔覆区的显微硬度约为基体的10倍。
The microhardness of the cladding zone is 10 times of the substrate.
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