期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.139222
关键词
Al-Mn strip; Twin-roll casting; Heterogeneous structure; Ductile fracture
类别
资金
- National Natural Science Foundation of China [51621063, 51625103, 51790482, 51722104, 51801147]
- National Key Research and Development Program of China [2017YFB0702301]
- 111 Project of China [BP2018008]
- International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies
The microstructure and mechanical properties of the twin-roll cast (TRC) and traditional direct-chill cast (DC) Al-Mn strip have been compared using electron backscattered diffraction, scanning electron microscope, transmission electron microscope, and atom-probe tomography. The TRC Al-Mn strip showed a heterogeneous microstructure and texture along the thickness direction of the strip, forming a 'hard shell-soft core' structure. This heterogeneous microstructure resulted in a mutual constraint between the surface region and the center region, enabling the TRC strip to be plastically deformed to a total elongation >30% prior to fracture. In comparison, the DC strip, with a relatively homogeneous microstructure and texture, exhibited a uniform elongation close to zero. The distinct tensile properties presented by the two strips have been rationalized in terms of the differences in their microstructural features, including grain size/orientation, dislocation density, coarse constituent particles and solute atoms. A micromechanics model has been employed to understand the superior ductility of the TRC strip.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据