Production of Aluminum metal matrix composite reinforced with Al-Cr-Fe quasicrystal nano-powder by using accumulative roll bonding process and investigation mechanical properties

oleh: Shima Pashangeh, Morteza Alizadeh, Rasool Amini

Format: Article
Diterbitkan: Marvdasht Branch, Islamic Azad University 2021-08-01

Deskripsi

In the present study, the Al72Cr17Fe11 quasicrystal nano-powder was synthesized through mechanical alloying. Phase investigation revealed the formation of decagonal quasicrystal structure on a nanometer scale. After that, the aluminum matrix composites reinforced by 3 wt.% of produced quasicrystal powder were fabricated by using the accumulative roll bonding process. Microstructural and mechanical properties were evaluated using scanning electron microscopy and microhardness and tensile tests, respectively. Microstructural studies showed that there was an improvement in the distribution of the quasicrystalline reinforcement phase in the aluminum metal matrix composite as well as an improvement in the bonding between the layers by increasing the cycles of the accumulative roll bonding process. Investigation of microhardness changes showed an increase in hardness value by adding a reinforcing phase in comparison to pure aluminum in the range of 74.5 to 105.8 Vickers after 8 cycles. Stress-strain curves of composite specimens showed that the tensile strength of composite specimens and their elongation increase continuously with increasing cycles of the accumulative roll bonding process. Tensile strength increased between 165 to 250 MPa with increasing rolling cycles from 2 to 8. The maximum toughness (30.2 (energy/volume (MPa)) was obtained after 8 cycles.