Microstructure and corrosion behavior of a Zr-Sn-Nb-Fe-Cu-O alloy fabricated by α+β quenching processing

17th IUMRS International Conference in Asia

Chen, Liangyu^1,2 ; Zhang, Lina^1 ; Chai, Linjiang^3 ; Yang, Wenlong^4 ; Wang, Liqiang^2 ; Lu, Weijie^2

School of Mathematics and Science, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu

212003, China^1

State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai

200240, China^2

College of Materials Science and Engineering, Chongqing University of Technology, Chongqing

400054, China^3

Department of Applied Science, Harbin University of Science and Technology, Harbin

150080, China^4

关键词: Annealed samples;    Corrosion behavior;    Corrosion kinetics;    Electron back scatter diffraction;    Normal direction;    Rolling direction;    Second phase particles;    Solid solubilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/182/1/012019/pdf
DOI  :  10.1088/1757-899X/182/1/012019

来源: IOP

【 摘 要 】

In this work, the microstructure of a Zr-Sn-Nb-Fe-Cu-O alloy fabricated by a+β quenching processing (ABQ sample) was investigated by the combined utilization of scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy. The results showed that the polygonal grains evenly distributed in ABQ sample and triangular grains distributed at triple junctions of polygonal grains with densely second phase particles (SPPs). The textures of0002 directions tilted approximately 25° from normal direction and the rolling direction spreading along the1120 -1010 were found in the sample, which was also detected in the regularly cold rolled and annealed sample. The occurrence of corrosion kinetics transition of ABQ sample was sight earlier than that of RAX sample. Due to a higher solid solubility of β-Zr, SPPs re-dissolved into β-Zr during a+β annealing and precipitated out afterward in those areas. Finally, discrepant corrosion rate of metal matrix and SPPs led to the formation of protrusions of matrix, which could concentrate stress and generate cracks in the oxide.