Achieving highly strengthened Al-Cu-Mg alloy by grain refinement and grain boundary segregation

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

卷:793

Article

Masuda, Takahiro¹  Sauvage, Xavier²  Hirosawa, Shoichi¹  Horita, Zenji^3,4,5 

[1] Yokohama Natl Univ, Dept Mech Engn & Mat Sci, Yokohama, Kanagawa 2408501, Japan

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

[3] Kyushu Inst Technol, Grad Sch Engn, Kitakyushu, Fukuoka 8048550, Japan

[4] Kumamoto Univ, Magnesium Res Ctr, Kumamoto 8608555, Japan

[5] Saga Univ, Synchrotron Light Applicat Ctr, Saga 8408502, Japan

关键词: Aluminum alloys;    Severe plastic deformation;    Grain refinement;    High strength;    Grain boundary segregation;   

DOI  :  10.1016/j.msea.2020.139668

来源: Elsevier

【 摘 要 】

An age-hardenable Al-Cu-Mg alloy (A2024) was processed by high-pressure torsion (HPT) for producing an ultrafine-grained structure. The alloy was further aged for extra strengthening. The tensile strength then reached a value as high as similar to 1 GPa. The microstructures were analyzed by transmission electron microscopy and atom probe tomography. The mechanism for the high strength was clarified in terms of solid-solution hardening, cluster hardening, work hardening, dispersion hardening and grain boundary hardening. It is shown that the segregation of solute atoms at grain boundaries including subgrain boundaries plays a significant role for the enhancement of the tensile strength.

【 授权许可】

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