质子-氦离子协同辐照TiNi记忆合金的马氏体相变与应变恢复特性

在空间射线辐照环境下，航天器用TiNi记忆合金组件辐照损伤机理及其对马氏体相变与功能特性的影响是亟待解决的关键科学问题，但目前关于TiNi合金的辐照效应研究均采用单一质子/氦离子辐照。空间真实辐照环境是质子-氦离子协同辐照效应，而关于这方面的研究仍是空白。本项目拟选取质子和氦离子作为辐射源，以协同辐照的方式真实模拟宇宙空间复杂辐照环境，研究质子-氦离子协同辐照对TiNi合金的微观组织、马氏体相变及力学性能与应变恢复特性的影响规律；查明质子-氦离子协同辐照下缺陷主导多尺度组织的形成机制及演化规律；探究协同辐照诱导微观缺陷与马氏体相变的相互作用机制；揭示协同辐照影响力学行为及应变恢复特性的微观机理，建立协同辐照诱导微观缺陷—马氏体相变—力学性能及恢复特性的内在联系。本项目将为智能结构件在空间辐照环境下长期稳定的应用奠定坚实基础，为优异抗空间辐照性能新型记忆合金的设计提供理论支撑。

In space irradiation environment, the radiation damage mechanism of TiNi shape memory alloy components for spacecraft and its effect on martensitic transformation and functional properties are the key scientific problem to be solved. However, the research on the radiation effect of TiNi alloy is based on single proton/helium ion irradiation. The real radiation environment in space is the synergistic radiation effect of proton and helium ion, but the research on this aspect is still blank. The project intends to select the widely existing proton and helium ions in the space environment as the radiation source to simulate the space radiation environment with synergistic effect. In the project, the influence of synergistic irradiation on microstructure, martensitic transformation, mechanical properties and strain recovery characteristics are studied systematically. Formation mechanism and evolution of multi-scale structure dominated by defects under synergistic irradiation are revealed. The interaction mechanism of synergistic irradiation induced defects and martensitic transformation, is explored. And the micro-mechanism of synergistic irradiation affecting mechanical behavior and strain recovery characteristics is investigated. This project will lay a solid foundation for the long-term and stable application of intelligent structural parts in space irradiation environment, and provide support for the design of a new memory alloy with excellent anti-space irradiation properties.