多相纳米结构ZrCu基合金断口表面的形貌演变及断裂机制
Morphology Evolution on the Fracture Surface and Fracture Mechanisms of Multiphase Nanostructured ZrCu-Base Alloys.
作者信息
Qiu Feng, Zhu Lin, Zou Qian, Wang Lei, Han Xue, Li Qiang, Jiang Qi-Chuan
机构信息
Key Laboratory of Automobile Materials, Ministry of Education, and Department of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, China.
Department of Mechanical Engineering, Oakland University, Rochester, MI 48309, USA.
出版信息
Materials (Basel). 2017 Mar 13;10(3):284. doi: 10.3390/ma10030284.
A multiphase nanostructured ZrCu-base bulk alloy which showed a unique microstructure consisting of sub-micrometer scale Zr₂Cu solid solution, nano-sized twinned plate-like ZrCu martensite (ZrCu (M)), and retained ZrCu (B2) austenite was fabricated by copper mold casting. The observation of periodic morphology evolution on the fracture surface of the multiphase nanostructured ZrCu-base alloys has been reported, which suggested a fluctuant local stress intensity along the crack propagation. It is necessary to investigate the compressive deformation behavior and the fracture mechanism of the multiphase alloy and the relation to the unique microstructures. The results obtained in this study provide a better understanding of the deformation and fracture mechanisms of multiphase hybrid nanostructured ZrCu-based alloys and give guidance on how to improve the ductility/toughness of bulk ZrCu-based alloys.
通过铜模铸造制备了一种多相纳米结构的ZrCu基块状合金，其呈现出由亚微米级Zr₂Cu固溶体、纳米尺寸的孪晶板状ZrCu马氏体（ZrCu (M)）和残余ZrCu (B2)奥氏体组成的独特微观结构。已有报道观察到多相纳米结构ZrCu基合金断口表面的周期性形态演变，这表明沿裂纹扩展方向存在波动的局部应力强度。有必要研究该多相合金的压缩变形行为、断裂机制及其与独特微观结构的关系。本研究所得结果有助于更好地理解多相混合纳米结构ZrCu基合金的变形和断裂机制，并为如何提高块状ZrCu基合金的延展性/韧性提供指导。
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