Microstructure Evolution and Mechanical Properties of Nano-structured Al–0.2 wt%Zr Alloy Fabricated by Accumulative Roll Bonding (ARB) Process
| Autor: | Hamidreza Mohammadian Semnani, Ehsan Borhani, Bahram Azad |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Metallurgy Fractography 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Indentation hardness Accumulative roll bonding Brittleness 0103 physical sciences Ultimate tensile strength 0210 nano-technology Tensile testing |
| Zdroj: | Transactions of the Indian Institute of Metals. 70:2725-2732 |
| ISSN: | 0975-1645 0972-2815 |
| DOI: | 10.1007/s12666-017-1133-7 |
| Popis: | An Al–0.2 wt%Zr alloy was subjected to an accumulative roll bonding (ARB) process up to a strain of 8.0. The process led to ultrafine-grained materials with a mean grain size of 400 nm by 10-cycle ARB process, which was studied by atomic force microscopy (AFM). The Vickers microhardness measurements showed that the hardness value monotonously increased the number of ARB cycles and then reached a constant value of about 45 HV. Yield strength and tensile strength increased during the ARB process and reached to 125 and 158 MPa, respectively, after 10-cycles ARB process. The total elongation and uniform elongation were 65 and 48% before the ARB process and decreased after 10-cycle ARB to 17.5 and 6.5%, respectively. Also, after the tensile test, the fracture surfaces were studied by scanning electron microscope (SEM) and the result showed that the fracture mode in the 0 cycle (before ARB) and 1 cycle was ductile and changed to brittle with further ARB processing from 3 up to 10 cycles. |
| Databáze: | OpenAIRE |
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