OALib Journal期刊
ISSN: 2333-9721
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TiCu/Zn界面反应周期层片结构形成的热力学和动力学研究*
DOI: 10.11900/0412.1961.2013.00771, PP. 930-936
Keywords: TiCu/Zn,扩散偶,周期层片结构,热力学,动力学
Abstract:
研究了TiCu/Zn扩散偶在390和450℃退火后的扩散层组织,发现其扩散区域中形成了3类周期层片对,且γ+TiZn3层片对的厚度随温度升高而减小,但与退火时间无关.在TiCu/Zn扩散体系中,反应扩散主要受Zn原子向TiCu基体端扩散控制,Zn原子扩散至TiCu基体界面附近优先形成TiZn3,而Ti原子穿过γ层和Cu原子穿过TiZn3层向富Zn端长程扩散均很困难,Cu原子仅能通过短程扩散聚集形成γ相并长大.周而复始,扩散通道在γ+TiZn3两相区中来回振荡形成周期层片对,且其间距与形成的先后顺序无关.温度的升高加快了原子扩散和TiZn3层的形成,使层片对变薄.扩散通道往富Zn方向穿过三相区后,在经过ε+TiZn3和ε+Ti3Zn22两相区时,同样由于Ti和Cu原子长程扩散困难,形成ε+TiZn3和ε+Ti3Zn22周期层片对.
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[41] | Osinski K, Vriend A W, Bastin F, Loo F. Z Metallkd, 1982; 73: 258
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[42] | Su X P, Liu C, Yin F C, Wang J H. Scr Mater, 2010; 62: 485
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[46] | Rijnders M R, Kodentsov A A, Van Beek J A, Van Den Akker J, Van Loo F J J. Solid State Ionics, 1997; 95: 51
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[50] | Chen Y C, Zhang X F, Han L, Du Z W. Mater Lett, 2012; 76: 151
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[51] | Kodentsov A A, Rijnders M R, Van Loo F J J. Acta Mater, 1998; 46: 6521
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[58] | Soares D, Vilarinho C, Castro F. Scand J Metall, 2001; 30: 254
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