Indexed by:
Abstract:
In this investigation, a high-strength Mg-12Gd-1.0Er-0.5Zr (wt.%) alloy sheet was produced by hot extrusion (HE) and subsequent hardplate rolling (HPR) at different temperatures. The results indicate that the microstructures of these final-rolled sheets are inhomogeneous, mainly including coarse deformed grains and dynamic recrystallized (DRXed) grains, and the volume fraction of these coarse deformed grains increases as the rolling temperature increases. Thus, more DRXed grains can be found in R-385 degrees C sheet, resulting in a smaller average grain size and weaker basal texture, while the biggest grains and the highest strong basal texture are present in R-450 degrees C sheet. Amounts of dynamic precipitation of beta phases which are mainly determined by the rolling temperature are present in these sheets, and its precipitation can consume the content of Gd solutes in the matrix. As a result, the lowest number density of beta phase in R-450 degrees C sheet is beneficial to modify the age hardening response. Thus, the R-450 degrees C sheet displays the best age hardening response because of a severe traditional precipitation of beta' (more) and beta H / beta M (less) precipitates, resulting in a sharp improvement in strength, i.e. ultimate tensile strength (UTS) of - 518 +/- 17 MPa and yield strength (YS) of - 438 +/- 18 MPa. However, the elongation (EL) of this sheet reduces greatly, and its value is - 2.7 +/- 0.3%. By contrasting, the EL of the peak-aging R-385 degrees C sheet keeps better, changing from - 4.9 +/- 1.2% to - 4.8 +/- 1.4% due to a novel dislocation-induced chain-like precipitate which is helpful to keep good balance between strength and ductility. (c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University
Keyword:
Reprint Author's Address:
Email:
Source :
JOURNAL OF MAGNESIUM AND ALLOYS
ISSN: 2213-9567
Year: 2024
Issue: 6
Volume: 12
Page: 2345-2359
1 7 . 6 0 0
JCR@2022
Cited Count:
SCOPUS Cited Count: 8
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
Affiliated Colleges: