Mo对NbCr2/ Nb合金组织及性能影响

Effect of Mo on Microstructure and properties of NbCr2/Nb Alloy

摘要:

采用机械合金化+热压工艺制备了NbCr₂/Nb-XMo(X=0,2.5,5.0,7.5,10at.%)合金，研究了合金元素Mo对NbCr₂/Nb合金组织及性能的影响。结果表明：合金元素Mo主要存在于Nb基体中,对合金的物相不产生明显影响，合金仍由Nb固溶体和NbCr₂组成； Mo的添加使得NbCr₂/Nb的相界面处应力增加,使得NbCr₂颗粒中的层错/孪晶的密度增加，并促进了Nb基体中位错的运动，从而使得NbCr₂/Nb合金在保持高强度的同时,具有良好的塑性和韧性。

关键词:NbCr₂/ Nb合金;合金元素Mo;晶体缺陷;性能

Abstract:

NbCr₂/Nb-XMo (X=0, 2.5, 5.0, 7.5, 10at.%) alloys have been prepared by mechanical alloying and hot pressing. The effects of Mo on microstructures and properties of the NbCr₂/Nb alloy have been studied. The results show that the additions of Mo element do not change the phase components of the NbCr₂/Nb alloy, which are composed of Nb solid solution and NbCr₂. Adding alloying element Mo can increase the stress at the NbCr₂ / Nb phase interfaces, which promotes the increase of stacking fault /twinning in the NbCr₂ particles and the movement of dislocations in the Nb matrix. The NbCr₂ / Nb alloy adding with appropriate amount of alloying element Mo can maintain good plasticity and toughness as well as higher strength.

Key words:NbCr₂/Nb alloy; alloying element Mo; crystal defects; properties