Ni3Si/Zn体系中周期型层片组织的形成机理
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| Published in: | 中国有色金属学报：英文版 Vol. 24; no. 12; pp. 4053 - 4058 |
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| Main Author: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2014
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| Subjects: | |
| Online Access: | Get full text |
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| Bibliography: | 43-1239/TG The formation of periodic layered structure in Ni3Si/Zn diffusion couples with Zn in vapor or liquid state was investigated by SEM-EDS, FESEM and XRD. The results show that the diffusion path in solid-liquid reaction is Ni3Si/（T＋γ）/γ/…T/γ/Ni4Zn12Si3/γ/…Ni4Zn12Si3/γ/Ni4Zn12Si3/δ…/Ni4Zn12Si3/δ/liquid-Zn, and the diffusion path in solid-vapor reaction is Ni3Si/θ/（T＋γ）/γ/…/T/γ/…T/γ/vapor-Zn. With increasing Zn diffusion flux, the diffusion reaction path moves toward the Zn-rich direction, and the distance from the Ni3Si substrate to the periodic layer pair nearest to the interface decreases. In the initial stage of both reactions,γphase nucleates and grows within T matrix phase at first, and then conjuncts together to form a band to reduce the surface energy. Based on the experimental results and diffusion kinetics analysis, the microstructure differences were compared and the formation mechanism of the periodic layered structure in Ni3Si/Zn system was discussed. Ya LIU, Zhen DONG, Yuan-yuan SONG, Xu-ping SU, Hao TU （1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China; 2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China） Ni3Si;Zn;periodic layered structure;interface;diffusion |
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| ISSN: | 1003-6326 |