ZrO2对钼铼合金微观组织与性能的影响

The Effect of La2O3 on the Microstructure and Properties of Molybdenum Rhenium Alloy

摘要:

钼铼合金具有优良的力学性能和机加工性能,是电子、核工业等领域关键的结构材料。在钼铼合金中加入氧化锆,形成弥散强化作用,并结合形变强化来提高材料的力学性能。研究发现,合金粉粒度随着ZrO₂含量的增加而减小,在含量为0.7%时晶粒尺寸最细小均匀；ZrO₂颗粒在合金的变形和断裂过程中表现出钉扎效应,显著提升合金的抗拉强度、屈服强度和断后延伸率等力学性能；ZrO₂强化钼铼合金的抗拉强度和断后延伸率在ZrO₂含量为0.7%时达到最高值,随后减少；ZrO₂基本弥散分布在晶界处并与钼基体形成良好结合界面,可以抑制晶界的迁移,提高钼合金的变形抗力。

Abstract:

Molybdenum rhenium alloy has excellent mechanical and machining properties, and is a key structural material in fields such as electronics and nuclear industry. Adding zirconia to molybdenum rhenium alloy forms dispersion strengthening effect, and combined with deformation strengthening to improve the mechanical properties of the material. Research has found that the particle size of alloy powder decreases with the increase of ZrO₂ content, with the smallest and most uniform grain size at a content of 0.7%; ZrO₂ particles exhibit a pinning effect during the deformation and fracture process of the alloy, significantly improving its mechanical properties such as tensile strength, yield strength, and elongation after fracture. The tensile strength and elongation after fracture of ZrO₂ strengthened molybdenum rhenium alloy reach the highest value when the ZrO₂ content is 0.7%, and then decrease; ZrO₂ is basically dispersed at grain boundaries and forms a good bonding interface with the molybdenum matrix, which can inhibit the migration of grain boundaries and improve the deformation resistance of molybdenum alloys.