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		大尺寸单晶叶片中小角度晶界的形成与演化
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			Formation and Evolution of Low Angle Grain Boundary in Large-Scale Single Crystal Superalloy Blade
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| 图12. 起晶段晶粒生长形貌及晶粒(晶界)标记 | 
| Fig.12. Morphology of grain growth in the starter block (a) and marks of grains (grain boundary) (b) | 
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