Structural-functional integrated TiB2/Al-Mg-Gd composite with efficient neutron shielding phases and superior mechanical properties
Structural-functional integrated TiB2/Al-Mg-Gd composite with efficient neutron shielding phases and superior mechanical properties
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结构功能一体化 TiB2/Al-Mg-Gd 复合材料，具有高效的中子屏蔽相和优异的机械性能
DOI：
10.1016/j.intermet.2022.107630
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发表时间：
2022-06-14
期刊：
影响因子：
4.4
通讯作者：
Wang, Haowei
中科院分区：
文献类型：
--
作者：
Chen, Yang;Chen, Yuechen;Wang, Haowei
采用雾化复合粉末制备、放电等离子烧结和热挤压等工艺制备了TiB 2/Al-Mg-Gd结构-功能一体化复合材料。以这种方式，雾化过程有效地细化含Gd相和分散的TiB 2颗粒在复合粉末中。这种细化被继承到挤出复合材料。详细地说，较细的含Gd相被确认为tau（MgNi 2型）Laves相。在功能上，该复合材料具有高的热中子屏蔽效率（99%），这是高于中子屏蔽材料的公开结果。这一现象用Shmakov-Yamamoto模型进行了分析。理论模拟结果表明，细化Tau相是提高中子屏蔽性能的关键，与实验结果吻合较好。从结构上看，TiB 2/Al-Mg-Gd复合材料的屈服强度、抗拉强度和伸长率分别为353 +/- 5 MPa、464 +/- 6 MPa和15.6 +/-0.4%。这种机械性能比现有的中子屏蔽材料高得多。对于屈服强度的提高，定量分析了固溶强化效应和晶粒细化强化效应是主要的强化贡献者。最后，这种新型的复合材料可以是一个有前途的候选人，在未来的中子屏蔽材料。
The structural-functional integrated TiB2/Al-Mg-Gd composite was fabricated by the powder metallurgy-based methods, including atomized composite powder fabrication, spark plasma sintering and hot extrusion techniques. In this manner, the atomization process effectively refined Gd-contained phases and dispersed TiB2 particles in composite powders. Such refinement was inherited to the as-extruded composite. In detail, the finer Gd-contained phase was confirmed to be tau(MgNi2-type) Laves phase. Functionally, the composite had high thermal neutron shielding efficiency (99%), which was higher than the published results for neutron shielding materials. This phenomenon was analyzed by the Shmakov-Yamamoto model. The theoretical simulation showed that the refinement of tau phases played a key role in improving the neutron shielding property, which agreed well with experiment results. Structurally, the yield strength, tensile strength and elongation of the TiB2/Al-Mg-Gd composite were 353 +/- 5 MPa, 464 +/- 6 MPa and 15.6 +/- 0.4%, respectively. Such mechanical properties were considerably higher over available neutron shielding materials. Regarding the improved yield strength, both solution strengthening effect and grain refinement strengthening effect were quantitatively analyzed to be the major strengthen contributors. Finally, this novel composite can be a promising candidate for neutron shielding materials in future.