Effect of cryogenic treatment on the fracture toughness of aircraft aluminum alloy 7075

3rd International Youth Scientific Forum with International Participation "New Materials"

Ermishkin, V.A.^1 ; Soloveva, Y.B.^1

Baikov Institute of Metallurgy and Materials Science (IMET RAS), Leninskiy prospect 49, Moscow, Russia^1

关键词: Aluminum alloy 7075;    Copper coatings;    Cryogenic deformation;    Dispersion particles;    Macroscopic and microscopic;    Solution heat treated;    Ti coating;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/347/1/012054/pdf
DOI  :  10.1088/1757-899X/347/1/012054

来源: IOP

【 摘 要 】

Influence of three types of the treatment on fracture toughness of the Al-7075 alloy was investigated in this study. Commercial Al-7075 alloy in the solid solution heat-treated condition was processed by hardening with post-cryogenic deformation treatment and PVD deposition titanium and copper coatings. The fracture toughness was estimated with using macroscopic and microscopic approaches. The conditions for the coincidence of the fracture toughness estimates between brittle fracture mechanics and the photometric analysis of structural images (PHASI) methods were achieved. The highest fracture toughness was obtained by applying hardening, cryogenic compression, ageing and deposition of the Ti-coating, leading to dispersion particles precipitation.