The coupling influences and corresponding mechanisms of high efficiency thermal-magnetic treatments on the dimensional stability of Al-Cu-Mg alloy
The coupling influences and corresponding mechanisms of high efficiency thermal-magnetic treatments on the dimensional stability of Al-Cu-Mg alloy
复制标题
DOI：
10.1016/j.jallcom.2022.167187
复制
发表时间：
2022-09
影响因子：
6.2
通讯作者：
Yufeng Song;W. Du;Lizhong Zhao;Lijun Zeng;Wen-hui Liu;Yu-qiang Chen;B. Zhu;Xuefeng Zhang;Xuefeng Ding
中科院分区：
文献类型：
--
作者：
Yufeng Song;W. Du;Lizhong Zhao;Lijun Zeng;Wen-hui Liu;Yu-qiang Chen;B. Zhu;Xuefeng Zhang;Xuefeng Ding
Al-Cu-Mg合金被广泛用作陀螺仪导航系统的关键部件，因为它们在不同的使用环境（例如，热或磁场）是可靠导航的决定性因素。在这项工作中，在热-磁场耦合下的预处理被施加到优化的合金的尺寸稳定性，通过定制的微观结构缺陷和第二相。在523 K和B = 0.3 T的条件下，经过6 h的高效热磁处理后，合金的热应变迅速降低到1.67 × 10- 3，达到1.58 × 10 - 3。尺寸的变化主要归因于位错密度，体积分数和形状的Al 2CuMg相。此外，热磁耦合处理还促进了Al 2CuMg相的形核和位错的湮灭。这些微结构的演变加速了储能的减少和晶格畸变，从而迅速降低了热应变。因此，热磁场处理是提高Al-Cu-Mg合金尺寸稳定性的一种有效方法，可进一步应用于空间探测领域。
Al-Cu-Mg alloys are widely utilized as a key component of gyroscope navigation systems, since their dimensional stability under different service environments (e.g., thermal or magnetic fields) is the determinant factor for reliable navigation. In this work, a preliminary treatment under the coupling of thermal-magnetic fields was applied to optimize the dimensional stability of the alloy by tailoring the microstructural defects and second phases. A lower thermal strain value of ∼1.58 × 10–3was rapidly achieved after 6 h by high-efficiency thermal-magnetic treatments (523 K andB= 0.3 T), in comparison with ∼1.67 × 10–3by thermal treatment. The dimensional variation was mainly attributed to the dislocation density, volume fraction and shape of the Al2CuMg phase. Furthermore, the nucleation rate of Al2CuMg phases and the annihilation of dislocations were promoted under the coupling effect of the thermal-magnetic treatments. These microstructural evolutions accelerated the reduction of the stored energy and lattice distortion, therefore rapidly decreasing the thermal strain. As a result, a thermal-magnetic field treatment may serve as an effective method to improve the dimensional stability of Al-Cu-Mg alloys for further application in the field of space exploration.