THERMODYNAMICAL AND KINETIC INVESTIGA-TION OF FORMATION OF PERIODIC LAYERED STRUCTURE IN TiCu/Zn INTERFACE REACTION
Received date: 2013-11-27
Revised date: 2014-03-14
Online published: 2014-08-25
Supported by
Supported by National Natural Science Foundation of China (Nos.51171031 and 51201023)
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.
Key words： TiCu/Zn; diffusion couple; periodic layer structure; thermodynamics; kinetics
Changjun WU , Chenlu ZHU , Xuping SU , Ya LIU , Haoping PENG , Jianhua WANG . THERMODYNAMICAL AND KINETIC INVESTIGA-TION OF FORMATION OF PERIODIC LAYERED STRUCTURE IN TiCu/Zn INTERFACE REACTION[J]. Acta Metall Sin, 2014 , 50(8) : 930 -936 . DOI: 10.11900/0412.1961.2013.00771
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