Effects of nanometric inclusions on the microstructural characteristics and strengthening of a friction-stir processed aluminum-magnesium alloy

被引：58
作者：
Khodabakhshi, F. [1 ]
Simchi, A. [2 ,3 ]
Kokabi, A. H. [2 ]
Svec, P. [4 ]
Simancik, F. [5 ]
Gerlich, A. P. [6 ]
机构：
[1] Shiraz Univ, Sch Engn, Dept Mat Sci & Engn, Shiraz, Iran
[2] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran 14588, Iran
[3] Sharif Univ Technol, Inst Nanosci & Nanotechnol, Tehran 14588, Iran
[4] Slovak Acad Sci, Inst Phys, Bratislava, Slovakia
[5] Slovak Acad Sci, Inst Mat & Machine Mech, Bratislava, Slovakia
[6] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 642卷
关键词：
Al alloy; Friction stir processing; Nanocomposite; TiO2; Phase formation; Mechanical property; MATRIX COMPOSITE-MATERIALS; AL-MG ALLOY; MECHANICAL-PROPERTIES; IN-SITU; AEROSPACE APPLICATIONS; FRACTURE-BEHAVIOR; SURFACE COMPOSITE; GRAIN-SIZE; TIO2; NANOCOMPOSITES;
D O I：
10.1016/j.msea.2015.06.081
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
An aluminum-magnesium alloy was friction-stir processed in the presence of TiO2 nanoparticles which were pre-placed in a groove on the surface to produce a composite. Field emission-scanning and transmission electron microscopy studies show that solid state chemical reactions occur between the Al-Mg matrix and the ceramic particles upon the severe plastic deformation process. The microstructure of the aluminum alloy consists of a coarse grain structure, large complex (Fe,Mn,Cr)(3)SiAl12 particles, and small Mg2Si precipitates. After friction stir processing, a deformed grain structure containing rod-like Al-Fe-Mn-Si precipitates is attained, along with cuboidal (similar to 100 nm) Cr-2 precipitates and spherical (similar to 100 and 5 nm) Mg2Si particles. In the presence of TiO2 nanoparticles, magnesium oxide (MgO) and titanium aluminide (Al3Ti) nanophases are formed. It is shown that these microstructural modifications lead to a significant enhancement in the hardness and tensile strength of the aluminum alloy. The relationship between the microstructural evolution and mechanical properties and the role of hard inclusions are presented and discussed. An analysis based on strengthening models indicates that the yield strength of the nanocomposite is mainly controlled by dislocations and grain boundaries rather than the nano-scale inclusions. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：215 / 229
页数：15
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