热电材料是一种可以在静态下实现电能和热能之间相互转换的新型能源材料，在温差发电与热电制冷领域具有很高的应用价值。本课题以固溶Mg2Si基合金为对象，通过高温高压技术手段理性可控制备Mg2Si基材料不同高压相，并研究后续热处理过程中的组织结构演化行为与规律，探讨温压调控新型 Mg2Si基合金微观组织机理及可逆相变调控声子散射中心机制，揭示高压制备的Mg2Si基热电材料晶粒、缺陷及晶体取向等演变规律；通过开发制备技术及调控工艺，实现具有高性能的 Mg2Si基合金多级结构的可控制备，丰富提高材料的热电性能的基础理论，拓展高性能多级结构热电材料的制备技术，为热电材料的性能优化提供新的理论依据和技术基础。开发出具有高热电性能的多级结构的Mg2Si基合金制备新技术，进而研究新型Mg2Si基合金热电性能调控方案，深化和丰富热电材料微观组织演变理论，推动高性能热电材料的实际应用。

Thermoelectric materials are new energy materials that can convert electricity and heat. They have high application value in thermoelectric power generation and thermoelectric refrigeration. In this study, the solid solution Mg2Si-based alloy is used as the object, and the high temperature and pressure technologies can be used to control the different high-pressure phases of Mg2Si-based alloys. The evolution behavior and law of microstructure during the subsequent heat treatment are studied, and the new Mg2Si-based alloys under temperature and pressure regulation are discussed. Microscopic mechanism and reversible phase change control phonon scattering center mechanism, revealing the evolution of Mg2Si-based thermoelectric materials such as grains, defects and crystal orientation; and developing high-performance Mg2Si-based alloys through development and preparation techniques and control processes The controllable preparation of the grade structure enriches the basic theory of improving the thermoelectric properties of materials, and expands the preparation technology of high-performance multi-stage thermoelectric materials, providing a new theoretical basis and technical basis for the performance optimization of thermoelectric materials. A new technology for preparing Mg2Si-based alloys with multi-stage structure with high thermoelectric properties should been developed, and the thermoelectric performance control scheme of new Mg2Si-based alloys should been studied. The theory of microstructure evolution of thermoelectric materials should been deepen and enriched to promote the practical application of high-performance thermoelectric materials.