超声表面滚压技术制备梯度纳米结构材料

Gradient Nanostructured Materials Induced by Ultrasonic Surface Rolling Process

摘要:

介绍了超声表面滚压技术（USRP）在制备梯度纳米结构材料中的应用。USRP技术能在材料表面构建梯度纳米结构层并引入残余压应力，同时显著降低材料表面粗糙度并提升表面均匀性。讨论了与USRP加工工艺及过程密切相关的微观结构演变和表面特性，分析了不同材料体系及工艺参数对USRP处理的影响规律。研究表明，采用合适的USRP处理工艺可改善材料表面的力学性能，即硬度，强度，耐磨性及抗疲劳性能等，而腐蚀/氧化行为则更依赖于材料的组织结构、表面完整性、应力状态、不同的腐蚀介质及服役环境等因素的综合作用。此外，对USRP制备梯度纳米结构材料面临的一些基础科学问题和工业应用探索进行了讨论和展望。

Abstract:

The application of ultrasonic surface rolling process (USRP) to obtain gradient nanostructured materials is presented with comprehensive researches. Concept and description of USRP treatment which has been proved to be able to create gradient nanostructured layers and induce residual compressive stress were depicted. Meanwhile, the microstructural evolutions and surface characteristics which critically depend on processing regimes were discussed. On this basis, it is found that the improvement of mechanical properties, i.e. hardness, strength, wear and fatigue performances, is obtained by USRP treatment while the corrosion/oxidation behavior depends on the composition and structure, surface integrity and stress, solution and service environment. In addition, some possible addresses for future research in this field were drawn and underlined.