Combined Fe and O effects on microstructural evolution and strengthening in Cu-Fe nanocrystalline alloys

被引：22

作者：

Guo, Jinming ^{[1
,2
]}

Shao, Qinqin ^{[1
,3
]}

Renk, Oliver ^{[4
]}

Li, Lei ^{[2
]}

He, Yunbin ^{[2
]}

Zhang, Zaoli ^{[1
,4
]}

Pippan, Reinhard ^{[1
]}

机构：

[1] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria

[2] Hubei Univ, Sch Mat Sci & Engn, Wuhan 430062, Peoples R China

[3] Hunan Univ, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Hunan, Peoples R China

[4] Univ Leoben, Chair Mat Phys, Dept Mat Sci, A-8700 Leoben, Austria

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 772卷

基金：

中国国家自然科学基金; 奥地利科学基金会; 欧洲研究理事会;

关键词：

Nanocrystalline alloy; Severe plastic deformation; High pressure torsion; Transmission electron microscopy; Oxygen effect; Microstructural evolution; SEVERE PLASTIC-DEFORMATION; GRAIN-REFINEMENT; MECHANISM; STABILIZATION; TEMPERATURE; TRANSITION; OXIDE;

D O I：

10.1016/j.msea.2019.138800

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Immiscible Cu-Fe composites with various compositions are mechanically alloyed by means of high pressure torsion directly from blended powders and vacuum arc-melted bulk materials respectively, which contain different contents of oxygen. All investigated compositions are deformed to extremely large strains reaching a saturated state consisting only of a single face-centered cubic structure. It is found that Fe alloying as well as O addition reduce the achievable grain sizes. The single phase supersaturated solid solutions show a reduced hardness compared to the Cu and Fe heterostructures with similar grain sizes, reflected in a decreasing hardness with increasing strain. In addition, oxygen introduced during powder processing has a significant influence on the microstructures, defect densities and thus properties. Samples generated from powders have smaller grain sizes and much higher dislocation and twin densities than the corresponding arc-melted bulk samples with the same nominal composition. The combined effects of Fe and O on the deformation behavior and hardness of Cu-Fe nanocrystalline alloys are discussed. The current work shows that microstructure and properties can be tuned not only by alloying, but even further by incorporating oxygen, which may offer another design strategy for nanocrystalline alloys.

引用

页数：9

共 37 条

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