现代切削技术的发展对以Ti-Al-N为代表的刀具涂层材料的性能尤其是热稳定性提出了更苛刻的要求。制备Ti-Al-N基纳米多层膜是改善Ti-Al-N薄膜力学性能和热稳定性的重要途径，而界面应力是影响纳米多层膜中Ti-Al-N高温相变的重要因素，目前有关这类薄膜中界面应力对Ti-Al-N高温相变的影响机理尚不明确。本项目拟选择Ti-Al-N与不同晶格常数的材料组合设计制备成Ti-Al-N基纳米多层膜，通过控制多层膜中的Ti-Al-N与另一组成材料形成共格生长结构，引入不同的界面应力到纳米尺寸的Ti-Al-N中，借此研究具有不同界面应力状态的纳米多层膜的高温相变行为，揭示界面应力对纳米多层膜中Ti-Al-N高温相变的影响机理，探索控制Ti-Al-N高温相变进而提高薄膜高温性能的方法。项目研究结果将大大丰富纳米材料相变的实验和理论内容，并为制备具有高硬度和高热稳定性的含Al氮化物薄膜提供理论指导。

The development of modern cutting technology has put forward higher demand for the properties of the coatings represented by Ti-Al-N, especially for the thermal stability. The synthesis of Ti-Al-N based nanomultilayers can effectively improve the thermal stability and mechanical properties of Ti-Al-N. The interface stress is an important factor influencing the phase transformation of Ti-Al-N in nanomultilayers, however the exact effect mechanism of interface stress is still unknown now. In this project, some materials with different lattice constant will be selected to synthesize the nanomultilayers with Ti-Al-N. The different interface stress can be introduced into the Ti-Al-N layers in nanomultilayers when the coherent structures between Ti-Al-N and the other material are formed by the control of the microstructure. The aim of this project is to study the phase transformation behavior of Ti-Al-N based nanomultilayers at high temperatures, and to reveal the effect mechanism of interface stress on the phase transformation of nanoscale Ti-Al-N, and to explore the appropriate method to increase their thermal stability. Finally, the research results would enrich the experimental and theoretical content of nano materials,and provide theoretical guidance to obtain nitride hard films consisting of Al with high hardness and excellent thermal stability.