新型高强高阻尼镁合金大环件的形性一体化制备基础研究

高强高阻尼镁合金大环件制备是关乎国家安全和强国战略亟需的关键技术，对实现我国新一代航天器和军工装备的减重增程、大机动、高过载、精准控制极为重要，具有巨大技术经济价值和战略意义。本项目围绕我国航天XXX端框环件减重减振的紧迫需求，针对镁合金环件制备存在的材料难题（强度-塑性、强度-阻尼不兼得）和成形难题（传统“以大铸锭制造大构件”的环件成形工艺与镁合金难成形特性不匹配），提出“LPSO强化增塑增阻、固溶强化增塑增阻”形性一体化合金设计新思想和“多场耦合离心铸造-多维非对称环轧”短流程成形新工艺，研究LPSO相、固溶原子与强度、阻尼和成形性的内在联系，澄清多场耦合非平衡凝固控制机制，揭示多维非对称塑性变形对织构、孪晶、再结晶的影响规律，建立高强高阻尼镁合金形性一体化合金设计准则，形成大型环件离心铸造-多维非对称环轧短流程成形技术原型，推动我国航空航天等领域重大装备的轻量化与升级换代。

Preparation of high-strength and high-damping magnesium alloy rings with large scale is a key technology, which is urgently needed for national security and powerful country strategy. It is extremely important to realize the reducing weight and increasing range, great mobility, high overload capacity and precise control of a new generation of spacecraft and military equipment of our country. There is a great technical economic value and strategic significance. According to weight and vibration reduction requirements of border end frame ring on aerospace XXX of China, this project aims at the material bottleneck problem (It is not easy to obtain a good balance of strength, ductility and damping capacity.) and processing bottleneck problem (The traditional forming process of making large component rings with large ingot does not match with the difficult forming characteristics of magnesium alloy.) in the preparation of magnesium alloy ring with large scale. Here, we propose a novel design idea of "LPSO strengthening, increasing ductility and damping capacity. Solid solution strengthening, increasing ductility and damping capacity." and a new short process of "Multi-field coupled centrifugal casting - Multi-dimensional asymmetric ring rolling". Research on the internal relationship between LPSO phase and solid solution atoms as well as strength, damping and formability. Clarify the nucleation and growth mechanism of grains in the process of multi-field coupling non-equilibrium solidification. Reveal the influence law of stress-strain field of multi-dimensional asymmetric processing on the texture, twinning and recrystallization behavior. Establish a shape and performance integrated design criterion of high-strength and high-damping magnesium alloy. Form the prototype of centrifugal casting - multidimensional asymmetric ring rolling process of large rings. And promote the lightweight and upgrading of major equipment in China's aerospace and other fields.