Manufacturing Technology 2020, 20(1):60-65 | DOI: 10.21062/mft.2020.004

The Effect of Cryogenic Treatment on Mechanical Properties, Wear and Corrosion Resistance of Aluminium Alloy AW7075

Ludmila Kučerová1, Jiří Hájek2, Jan Vítek2
1 Regional Technological Institute, UWB in Pilsen, Univerzitní 8, 30100 Plzeň, Czech Republic.
2 Department of Material Science and Technology, UWB in Pilsen, Univerzitní 8, 30100 Plzeň, Czech Republic.

Effect of addition of cryogenic treatment to a standard heat treatment of aluminium alloy AW 7075 was tested in this work. Used heat treatment consisted of solution annealing at 470 °C for two hours and precipitation aging treatment at 130°C for 14 hours, 120 °C for 24 hours or natural aging at room temperature for 60 days. One set of samples was processed by solution annealing and aging treatment and the second set of samples incorporated 24 hours long cryogenic treatment at -185 °C between the same solution annealing and aging. Both sets of samples were characterised by tensile testing, notch impact testing, hardness measurement, microstructure analysis and wear and corrosion resistance tests. Obtained results were compared for corresponding processing with and with-out cryogenic treatment. While impact toughness and corrosion resistance were decreased by cryogenic treatment, tensile strength and wear resistance were on the other hand improved.

Keywords: aluminium alloy, cryogenic processing, heat treatment
Grants and funding:

Ministry of Education, Youth and Sport of the Czech Republic, Project LO1502 ‘Development of the Regional Technological Institute‘ European Cryogenic Institute

Prepublished online: July 31, 2020; Published: August 6, 2020  Show citation

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Kučerová L, Hájek J, Vítek J. The Effect of Cryogenic Treatment on Mechanical Properties, Wear and Corrosion Resistance of Aluminium Alloy AW7075. Manufacturing Technology. 2020;20(1):60-65. doi: 10.21062/mft.2020.004.
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