Bibliographic Details
| Title: |
Extra-conventional strengthening mechanisms in non-recrystallized grains of an extruded Mg-Gd-Zr alloy |
| Authors: |
Qiang Yang, Shuhui Lv, Kai Guan, Zefeng Xie, Xin Qiu |
| Source: |
Journal of Magnesium and Alloys, Vol 12, Iss 11, Pp 4561-4573 (2024) |
| Publisher Information: |
KeAi Communications Co., Ltd., 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Mining engineering. Metallurgy |
| Subject Terms: |
Magnesium alloys, Transmission electron microscopy (TEM), Microstructure, Strengthening mechanism, Distortion area, Mining engineering. Metallurgy, TN1-997 |
| More Details: |
Mg-RE (RE = rare earth) based alloys generally exhibit outstanding mechanical properties. However, their high-strength seems to be unexplained using classic strengthening mechanisms in some cases. Herein, a Mg-13Gd-0.4Zr (wt%) alloy that was fabricated by a conventional differential thermal extrusion plus artificial aging treatment exhibits ultra-high yield strength over 510 MPa in both tension and compression. Characterizations using Cs-corrected scanning transmission electron microscopy (STEM) show two unusual microstructures in non-recrystallized grains as: a large density of basal stacking faults (SFs) and profuse distortion areas (DAs). Atomic-resolution STEM imaging indicates that basal SFs are consisted of two types of intrinsic SFs, namely I1 and I2, and DAs are self-assembled by 〈c〉 and 〈c + a〉 screw partials. Their strengthening mechanisms are analogous to grain boundary strengthening and dispersion strengthening, respectively, contributing satisfactory yield-strength increments of ∼46 MPa and ∼76 MPa, respectively. Moreover, DAs improved aging hardening by inducing novel clusters at DA-related boundaries, or increasing the number density of βH’ precipitate and promoting their distribution along a certain direction. This work supplements the strengthening mechanisms in traditional high-strength Mg-RE(-Zr) based alloys and provides novel insights in the development of ultra-high-strength Mg alloys. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2213-9567 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2213956723002104; https://doaj.org/toc/2213-9567 |
| DOI: |
10.1016/j.jma.2023.09.024 |
| Access URL: |
https://doaj.org/article/9e76ab4192524e45bf52d1d7e4063c19 |
| Accession Number: |
edsdoj.9e76ab4192524e45bf52d1d7e4063c19 |
| Database: |
Directory of Open Access Journals |
