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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2. 单晶叶片起始扩展区显微组织 | 
| Fig.2. Microstructures in the extended region of single crystal superalloy blade(a) transversal section (b) magnification of transversal section (c) longitudinal section | 
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