The contribution of grain boundary sliding in tensile deformation of an ultrafine-grained aluminum alloy having high strength and high ductility

被引：36
|
作者：
Mungole, Tarang [1 ]
Kumar, Praveen [1 ]
Kawasaki, Megumi [2 ,3 ,4 ]
Langdon, Terence G. [3 ,4 ,5 ]
机构：
[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India
[2] Hanyang Univ, Div Mat Sci & Engn, Seoul 133791, South Korea
[3] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[4] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA
[5] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England
来源：
JOURNAL OF MATERIALS SCIENCE | 2015年 / 50卷 / 10期
基金：
美国国家科学基金会; 欧洲研究理事会;
关键词：
SEVERE PLASTIC-DEFORMATION; HIGH-PRESSURE TORSION; ATOMIC-FORCE MICROSCOPY; RESOLUTION ELECTRON-MICROSCOPY; SUPERPLASTIC FLOW; ROOM-TEMPERATURE; AL-ALLOY; METALS; BEHAVIOR; SHEAR;
D O I：
10.1007/s10853-015-8915-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An as-cast Al-7 % Si alloy was processed by high-pressure torsion (HPT) for up to 10 turns at temperatures of 298 or 445 K. The HPT-processed samples had ultrafine-grained structures and they were tested in tension at room temperature at various strain rates in the range from 1.0 x 10(-4) to 1.0 x 10(-2) s(-1). The contributions of grain boundary sliding (GBS) to the total strain were measured directly using atomic force microscopy. Samples simultaneously showing both high strength and high ductility contained the highest fractions of high-angle grain boundaries (HAGB) and exhibited the highest contributions from GBS, whereas samples showing high strength but low ductility gave negligible values for the sliding contributions. It is concluded that high strength and high ductility require both an ultrafine grain size and a high fraction of HAGB.
引用
收藏
页码：3549 / 3561
页数：13
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