A study on the effect of nano-precipitates on fracture behavior of nano-structured Al-2wt%Cu alloy fabricated by accumulative roll bonding (ARB) process
An Al-2wt%Cu alloy was subjected to accumulative roll bonding (ARB) process up to a strain of 4.8. The two kinds of different microstructures, i.e, solution treated (ST) one and 190°C pre-aged for 30 min (Aged), were prepared as the starting structures for the ARB process. The microstructur...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Technical Faculty, Bor
2016-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2016/1450-53391500028A.pdf |
| Summary: | An Al-2wt%Cu alloy was subjected to accumulative roll bonding (ARB) process
up to a strain of 4.8. The two kinds of different microstructures, i.e,
solution treated (ST) one and 190°C pre-aged for 30 min (Aged), were prepared
as the starting structures for the ARB process. The microstructures were
studied by transmission electron microscope (TEM) and electron backscattering
diffraction (EBSD). The results showed that the fine precipitates having the
average particle size of 16 nm were formed after aging process. On the other
hand, the mean grain size of the ST-ARB and the Aged-ARB specimens reached to
650 nm and 420 nm, respectively. Study of the fracture surfaces were carried
out by scanning electron microscope (SEM). The results indicated that at
0-cycle ARB, the specimens show dimples indicating the micro-void coalescence
(MVC) mechanism of ductile fracture. The average size of dimples was larger
in the ST-ARB specimen compared to the Aged-ARB specimen. The fracture mode
was transgranular cleavage fracture in the Aged-specimen. At 3- cycle and
6-cycle ARB, also the specimens showed cleavage facets and river lines, that
the river lines or the stress lines are steps between cleavage or parallel
planes, which are always converged in the direction of local crack
propagation. |
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| ISSN: | 1450-5339 2217-7175 |