Effect of Al2O3 on the Mechanical Properties of (B4C + Al2O3)/Al Neutron Absorbing Materials

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-07-02 DOI:10.1007/s40195-024-01711-2

J. X. Cai, B. M. Shi, N. Li, Y. Liu, Z. G. Zhang, Y. N. Zan, Q. Z. Wang, B. L. Xiao, Z. Y. Ma

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Abstract

B₄C/Al composites are widely utilized as neutron absorbing materials for the storage and transportation of spent nuclear fuel. In order to improve the high-temperature mechanical properties of B₄C/Al composites, in-situ nano-Al₂O₃ was introduced utilizing oxide on Al powder surface. In this study, the Al₂O₃ content was adjusted by utilizing spheroid Al powder with varying diameters, thereby investigating the impact of Al₂O₃ content on the tensile properties of (B₄C + Al₂O₃)/Al composites. It was found that the pinning effect of Al₂O₃ on the grain boundaries could hinder the recovery of dislocations and lead to dislocation accumulation at high temperature. As the result, with the increase in Al₂O₃ content and the decrease in grain size, the high-temperature strength of the composites increased significantly. The finest Al powder used in this investigation had a diameter of 1.4 μm, whereas the resultant composite exhibited a maximum strength of 251 MPa at room temperature and 133 MPa at 350 °C, surpassing that of traditional B₄C/Al composites.

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Al2O3 对（B4C + Al2O3）/Al 中子吸收材料机械性能的影响

B4C/Al 复合材料被广泛用作中子吸收材料，用于乏核燃料的储存和运输。为了改善 B4C/Al 复合材料的高温力学性能，利用铝粉表面的氧化物引入了原位纳米 Al2O3。本研究利用不同直径的球形铝粉调整 Al2O3 的含量，从而研究 Al2O3 含量对（B4C + Al2O3）/铝复合材料拉伸性能的影响。研究发现，Al2O3 对晶界的钉扎效应会阻碍位错的恢复，并导致高温下的位错累积。因此，随着 Al2O3 含量的增加和晶粒尺寸的减小，复合材料的高温强度显著提高。本研究中使用的最细铝粉的直径为 1.4 μm，而得到的复合材料在室温下的最大强度为 251 兆帕，在 350 °C 时的最大强度为 133 兆帕，超过了传统的 B4C/Al 复合材料。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.