Severe plastic deformation close to the melting point enables Mg-Fe nanocomposites with exceptional strength

被引：3
作者：
Roostaei, Milad [1 ]
Uggowitzer, Peter J. [2 ]
Pippan, Reinhard [1 ]
Renk, Oliver [1 ,3 ]
机构：
[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, Jahnstr 12, A-8700 Leoben, Austria
[2] Montanuniv Leobent, Chair Nonferrous Met, Dept Met, A-8700 Leoben, Austria
[3] Univ Leoben, Dept Mat Sci, Roseggerstr 12, A-8700 Leoben, Austria
来源：
SCRIPTA MATERIALIA | 2023年 / 230卷
关键词：
hcp-bcc nanocomposites; Magnesium; Iron; Nanostructured; High-pressure torsion; strain localization; HIGH-PRESSURE TORSION; GRAIN-REFINEMENT; MAGNESIUM; ALLOY; MICROSTRUCTURE; FRAGMENTATION; METAL; SATURATION; DUCTILITY; BEHAVIOR;
D O I：
10.1016/j.scriptamat.2023.115428
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The attractive properties of Mg-bcc nanocomposites have gained increasing interest, but fabrication to bulk scales failed so far as strain immediately localizes within the Mg-phase. Targeting successful processing strate-gies, we analyze the deformation behavior and resulting microstructures of Mg-Fe composites as a function of applied strain and processing temperature using high-pressure torsion. Counterintuitively, processing at 73% of Mg's melting point accelerated microstructural refinement and improved homogeneity. Suppressing strain localization of the phases, a three-fold hardness increase compared to ambient processing is obtained. Such hardness levels suggest that further optimization likely paves the way towards bulk Mg-based materials beyond a gigapascal strength.
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页数：5
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