Mechanisms of creep deformation in a rapidly solidified Al-Fe-V-Si alloy

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:805

Article

Zhang, M.¹  Lewis, R. J.¹  Gibeling, J. C.¹ 

[1] Univ Calif Davis, Dept Mat Sci & Engn, One Shields Ave, Davis, CA 95616 USA

关键词: Creep;    Aluminum alloys;    Particle-strengthened alloys;    Aging;    Al-Fe-V-Si;   

DOI  :  10.1016/j.msea.2021.140796

来源: Elsevier

【 摘 要 】

Creep experiments on a rapidly solidified Al-8.5 wt% Fe-1.3 wt% V-1.7 wt% Si alloy (FVS0812) suggest that it exhibits similar or superior deformation resistance compared to other high temperature Al alloys. However, aging at 798 K for 200 h resulted in severe loss of creep strength. Stress reduction results show that FVS0812 exhibits similar creep characteristics to those of other dispersion-strengthened alloys under constant structure conditions following stress reductions, even though the creep mechanism is determined to be significantly different. The operational activation area analysis reveals that the rate-controlling obstacles to dislocation glide are dislocation-dislocation interactions. The role of the particles is to carry a portion of the applied load rather than causing dislocation detachment, local climb, or general climb. This result contradicts the validity of modeling the material using the Rosler-Arzt approach or relying on a threshold stress that is based on the increase in dislocation line length during local or general climb.

【 授权许可】

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