Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574245 | Materials Science and Engineering: A | 2015 | 9 Pages |
Abstract
The aim of the present study is to investigate the effect of Alâ5Tiâ1B grain refiner on the microstructure, hardness and tensile properties of a new Zn-rich AlâZnâMgâCu alloy. The microstructural observations revealed that Ti addition refines the grain size (up to 95%) and dispersion of the second phase and subsequently forms rosette-shape grains. In addition, the grain refinement by Al3Ti particles resulted in an increase in the area fraction of the recrystallized regions as compared to unrefined specimens. After grain refinement and thermomechanical processes, the improvements of the tensile strength, yield strength and elongation values were nearly 33%, 25% and 1930% respectively, when compared to as-cast specimens. Computer simulation used to determine the strain and stress patterns showed a plastic strain gradient from the edge to the center of the hot worked specimen. The microscopic examination of the fracture surfaces showed dimple-like mechanism in deformed specimens while the presence of coarse eutectic constituent in interdendritic regions was responsible for brittle fracture in not deformed ones.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
S.H. Seyed Ebrahimi, J. Aghazadeh, K. Dehghani, M. Emamy, Sh. Zangeneh,