Achieving nanoscale Al2Cu dispersoids in wrought Al-4.5wt.%Cu alloy by semi-solid isothermal treatment and post room-temperature ECAP

Autor:	Jiaheng Li, Ye Zhuang, Yunfeng Hu, Mojia Li, Pu Zhang, Yingbo Zhang, Qi Zeng
Rok vydání:	2021
Předmět:	Quenching Materials science Mechanical Engineering Alloy engineering.material Condensed Matter Physics Isothermal process Mechanics of Materials Phase (matter) Ultimate tensile strength engineering General Materials Science Lamellar structure Grain boundary Composite material Eutectic system
Zdroj:	Materials Letters. 305:130787
ISSN:	0167-577X
Popis:	Al2Cu phase is the main strengthening phase of high-strength wrought Al-Cu based alloys. In this paper, a novel composite process coupling the semi-solid isothermal treatment and post room-temperature (RT) equal channel angular pressing (ECAP) is proposed to refine Al2Cu particles in a conventionally extruded Al-4.5wt.%Cu alloy. The results show that, after the optimized semi-solid treatment (610℃/10 min + 20℃ water quenching) the initial microscale Al2Cu particles transformed into lamellar eutectic at grain boundaries with a thickness of 70 ± 9 nm. The following ECAP broke the lamellar eutectic into nanoscale Al2Cu dispersoids, which significantly enhanced the tensile strength. As a result, the alloy subjected to the composite process exhibited the highest RT ultimate tensile strength(UTS) of 460 MPa and yield strength(YS) of 447 MPa compared with the initial extruded and direct ECAPed alloys.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5270846730c52547905684b476b76b56 https://doi.org/10.1016/j.matlet.2021.130787 Zobrazit plný text záznamu Full Text from ScienceDirect