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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g+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g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g相并长大.周而复始,扩散通道在g+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t+TiZn3和t+Ti3Zn22两相区时,同样由于Ti和Cu原子长程扩散困难,形成t+TiZn3和t+Ti3Zn22周期层片对.
The diffusion layer structure of TiCu / Zn diffusion couple annealed at 390 and 450 ℃ was studied. Three kinds of periodic layer pairs were found in the diffusion region, and the thickness of the g + TiZn3 layer pairs decreased with increasing temperature. But it has nothing to do with the annealing time.In the TiCu / Zn diffusion system, the reaction diffusion is mainly controlled by the diffusion of Zn atoms to the TiCu matrix. The Zn atoms preferentially form TiZn3 near the interface of TiCu matrix, while the Ti atoms pass through the G layer and Cu atoms The long-range diffusion of TiZn3 layer to Zn-rich side is very difficult, and the Cu atoms can only form g-phase and grow up by short-range diffusion.While, the diffusion channel oscillates back and forth in the g + TiZn3 two-phase region to form the periodic ply pair, and its The distance is independent of the order of formation.The increase of temperature accelerates the formation of atomic diffusion and TiZn3 layer and makes the ply thinner.When the diffused channel passes through the three-phase region in the direction of Zn enrichment, after t + TiZn3 and t + Ti3Zn22 two-phase region, the same due to the long-term diffusion of Ti and Cu atoms difficult to form t + TiZn3 and t + Ti3Zn22 periodic ply pairs.