In situ TEM investigation of microstructural behavior of superplastic Al-Mg-Sc alloy

被引：22
作者：
Dam, Karel [1 ,2 ]
Lejcek, Pavel [2 ]
Michalcova, Alena [1 ]
机构：
[1] Inst Chem Thechnol, Dept Met & Corros Engn, Prague 16628 6, Czech Republic
[2] ASCR, Inst Phys, Prague 18221 8, Czech Republic
来源：
MATERIALS CHARACTERIZATION | 2013年 / 76卷
关键词：
Aluminum alloys; Ultrafine-grained alloys; In situ TEM; Equal-channel angular pressing; STRAIN-RATE SUPERPLASTICITY; SEVERE PLASTIC-DEFORMATION; GRAIN-REFINEMENT; SCANDIUM; ALUMINUM; PRINCIPLES; ZIRCONIUM; ADDITIONS; KINETICS; RATES;
D O I：
10.1016/j.matchar.2012.12.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dynamic changes in microstructure of the superplastic ultrafine-grained Al-3Mg-0.2Sc (wt.%) alloy refined by equal-channel angular pressing (ECAP). were observed by in situ transmission electron microscopy at temperatures up to 300 degrees C (annealing and tensile deformation) in order to simulate the initial stages of superplastic testing. It was found that the microstructure changes significantly during the preheating before the superplastic deformation, which was accompanied by decreased microhardness. During the deformation at 300 degrees C, high dislocation activity as well as motion of low-angle grain boundaries was observed while high-angle grain boundaries did not move due to the presence of scandium in the alloy. (C) 2013 Elsevier Inc. All rights reserved.
引用
收藏
页码：69 / 75
页数：7
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