Mechanism of large strain accommodation assisted by shear localization in a precipitation-hardened Cu-Be alloy

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

卷:823

Article

Lomakin, Ivan^1,2  Nigmatullina, Alfiia¹  Sauvage, Xavier³ 

[1] St Petersburg Univ, Lab Mech Bulk Nanostruct Mat, St Petersburg 198504, Russia

[2] Aalto Univ, Dept Appl Phys, Complex Syst & Mat Grp, FI-02150 Espoo, Finland

[3] Normandie Univ, UNIROUEN, INSA Rouen, CNRS,Grp Phys Mat, F-76000 Rouen, France

关键词: Copper alloy;    Precipitation;    Shear band;    Strain localization;    Ultrafine grains;   

DOI  :  10.1016/j.msea.2021.141760

来源: Elsevier

【 摘 要 】

The influence of the structural state on deformation mechanisms under large strains was investigated in a Cu - 2 wt.% Be alloy. Torque evolutions during straining exhibit serrations typical of structural relaxations in the precipitation-hardened alloy, but not in the solid solution state. Microstructure characterization revealed that homogeneous deformation of the solid solution led to strong grain size reduction (20 nm), while localization occurred in the precipitated state with numerous shear bands. The role of CuBe precipitates on hindering dislocation glide and the resulting shear localization under large strain is discussed.

【 授权许可】

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