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Prebainitic Transformation and the Nucleation of Bainite in a Cu-Zn-Al Alloy

Meng Xiangkang Yang Yanqing Wu Xiaolei Kang Mokuang(Northwestern Polytechnical University,Xian 710072)  
Works on the prebianitic transformation and the nucleation of bainite in a Cu-Zn-Al alloyare conducted. Internal friction experiments show that the prebainitic transformation occursbasically with the diffusion or segregation process of solute atoms. Composition analyses revealthat solute atom’s depleted and rich regions resulted from solute atom’s segregation can be formed within prebainitic transformation. In situ observation of TEM indicates that bainite nu-cleate by shear in solute atom’s depleted regions.
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