Tailoring bimodal grain structure of Mg-9Al-1Zn alloy for strength-ductility synergy: Co-regulating effect from coarse Al2Y and submicron Mg17Al12 particles

Yong-Kang Li; Min Zha; Hai-Long Jia; Si-Qing Wang; Hong-Min Zhang; Xiao Ma; Teng Tian; Pin-Kui Ma; Hui-Yuan Wang

Journal of Magnesium and Alloys (Sep 2021)

Tailoring bimodal grain structure of Mg-9Al-1Zn alloy for strength-ductility synergy: Co-regulating effect from coarse Al2Y and submicron Mg17Al12 particles

Yong-Kang Li,
Min Zha,
Hai-Long Jia,
Si-Qing Wang,
Hong-Min Zhang,
Xiao Ma,
Teng Tian,
Pin-Kui Ma,
Hui-Yuan Wang

Affiliations

Yong-Kang Li: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China; Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
Min Zha: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China; Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China; International Center of Future Science, Jilin University, Changchun 130012, China; Corresponding authors at: Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China.
Hai-Long Jia: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China; International Center of Future Science, Jilin University, Changchun 130012, China
Si-Qing Wang: Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
Hong-Min Zhang: Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
Xiao Ma: Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
Teng Tian: Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
Pin-Kui Ma: Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China; International Center of Future Science, Jilin University, Changchun 130012, China
Hui-Yuan Wang: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China; Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China; International Center of Future Science, Jilin University, Changchun 130012, China; Corresponding authors at: Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China.

Journal volume & issue: Vol. 9, no. 5
pp. 1556 – 1566

Abstract

Read online

Grain boundary strengthening is an effective strategy for increasing mechanical properties of Mg alloys. However, this method offers limited strengthening in bimodal grain-structured Mg alloys due to the difficultly in increasing the volume fraction of fine grains while keeping a small grain size. Herein, we show that the volume fraction of fine grains (FGs, ∼2.5 µm) in the bimodal grain structure can be tailored from ∼30 vol.% in Mg-9Al-1 Zn (AZ91) to ∼52 vol.% in AZ91–1Y (wt.%) processed by hard plate rolling (HPR). Moreover, a superior combination of a high ultimate tensile strength (∼405 MPa) and decent uniform elongation (∼9%) is achieved in present AZ91–1Y alloy. It reveals that a desired bimodal grain structure can be tailored by the co-regulating effect from coarse Al2Y particles resulting in inhomogeneous recrystallization, and dispersed submicron Mg17Al12 particles depressing the growth of recrystallized grains. The findings offer a valuable insight in tailoring bimodal grain-structured Mg alloys for optimized strength and ductility.

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

About the journal

Abstract

Keywords