Stacking faults in a mechanically strong Al(Mg)–Al3Mg2 composite

Zhou，Dengshan1,2; Zhang，Xiuzhen1; Tehranchi，Ali2; Hou，Junhua3; Lu，Wenjun2,3; Hickel，Tilmann2; Ponge，Dirk2; Raabe，Dierk2; Zhang，Deliang1,4

2022-10-01

10.1016/j.compositesb.2022.110211

COMPOSITES PART B-ENGINEERING   Impact Factor & Quartile

1359-8368

Stacking faults (SFs), similar to other planar defects such as grain boundaries, twin boundaries and heterogeneous interfaces, can be tailored to simultaneously increase strength and ductility of metal matrix composites. However, SFs are rarely observed in Al alloy matrix composites, resulting from the high stacking fault energy (SFE) (166 mJ/m) of pure Al and its weak dependence on most alloying elements. Therefore, strengthening Al alloy matrix composites with SFs has been a longstanding challenge. In the current work, SFs with a density of 2.8 × 10 m are introduced into an ultrafine-grained Al(Mg)–AlMg composite fabricated by extruding compacted mechanically alloyed and nanostructured Al-11 at.% Mg alloy powder at 703 K. These SFs, together with grain boundaries and solute Mg, increase the yield strength of the as-extruded composite to 700 MPa at a tensile elongation of ∼4%. We show that the Al(Mg) alloy matrix-AlMg interfaces enable the formation of the densely arranged SFs. This finding offers a pathway to tailoring high strength Al alloy matrix composites through manipulating SFs by interface engineering.

Al-Mg alloy Matrix composite High Mg content High strength Matrix-particle interfaces Stacking faults

EI

English

Corresponding

National Natural Science Foundation of China[51701036];Shenzhen Science and Technology Innovation Program[JCYJ20210324104404012];

20223512640380

Alloying elements ; Aluminum alloys ; Binary alloys ; Grain boundaries ; High strength alloys ; Metallic matrix composites ; Powder metals ; Stacking faults

Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Aluminum Alloys:541.2 ; Magnesium and Alloys:542.2 ; Alkaline Earth Metals:549.2 ; Crystal Lattice:933.1.1

MATERIALS SCIENCE

2-s2.0-85136486252

Scopus

1.School of Materials Science and Engineering,Northeastern University,Shenyang,110819,China
2.Max-Planck-Institut für Eisenforschung,Düsseldorf,Max-Planck-Str. 1,40237,Germany
3.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,110819,China

Zhou，Dengshan,Zhang，Xiuzhen,Tehranchi，Ali,等. Stacking faults in a mechanically strong Al(Mg)–Al3Mg2 composite[J]. COMPOSITES PART B-ENGINEERING,2022,245.

Zhou，Dengshan.,Zhang，Xiuzhen.,Tehranchi，Ali.,Hou，Junhua.,Lu，Wenjun.,...&Zhang，Deliang.(2022).Stacking faults in a mechanically strong Al(Mg)–Al3Mg2 composite.COMPOSITES PART B-ENGINEERING,245.

Zhou，Dengshan,et al."Stacking faults in a mechanically strong Al(Mg)–Al3Mg2 composite".COMPOSITES PART B-ENGINEERING 245(2022).