CAJ | 학술논문

采用镶嵌式扩散偶技术制备 Al-Ti 扩散偶，在 Al 熔点以上，Ti 熔点以下进行扩散热处理，研究 Al-Ti液-固界面扩散反应层的组织结构演变及生长机制。实验结果表明，热处理后的扩散反应层为TiAl3颗粒和铝的混合组织，以TiAl3和液相铝的平衡化学位共存区逐层生长，生长界面朝铝基一侧移动；TiAl3相是热处理过程中最先出现也是唯一出现的新生相；钛相变前后，扩散反应层的生长机制发生了改变。相变前，由钛向液相铝中的溶解速度控制；相变后，转变为Al、Ti原子的化学反应速度控制，生长速度大幅度加快。
채용양감식확산우기술제비 Al-Ti 확산우，재 Al 용점이상，Ti 용점이하진행확산열처리，연구 Al-Ti액-고계면확산반응층적조직결구연변급생장궤제。실험결과표명，열처리후적확산반응층위TiAl3과립화려적혼합조직，이TiAl3화액상려적평형화학위공존구축층생장，생장계면조려기일측이동；TiAl3상시열처리과정중최선출현야시유일출현적신생상；태상변전후，확산반응층적생장궤제발생료개변。상변전，유태향액상려중적용해속도공제；상변후，전변위Al、Ti원자적화학반응속도공제，생장속도대폭도가쾌。
Al-Ti diffusion couples were made by embedded technology and treated at the temperature between the melting points of Al and Ti. The microstructure evolution and growth mechanism of the Al-Ti DRZ were investigated. The result shows that the DRZ, the mixture of TiAl3 and Al, grows layer by layer along their chemical equilibrium zone. In the course, the growth interface moves toward the aluminum side. TiAl3 is the only new phase which forms earliest in the course of heat-treatment. The growth mechanism of the DRZ changes after the phase transition of titanium. Before the phase transition of titanium, the growth of the DRZ is controlled by the dissolution speed of the titanium to the molten aluminum, while after the phase transition of titanium, the growth is controlled by the chemical reaction speed of Al and Ti atoms, and consequently, its growth rate is greatly increased.