CHARACTERIZATION AND SUSCEPTIBILITY TO INTERGRANULAR CORROSION OF AA2024 ALUMINUM ALLOY

2017 ◽  
Vol 31 (2) ◽  
pp. 7-11
Author(s):  
Vasile Hotea ◽  
Keyword(s):  
Aluminum Alloy ◽  
Grain Boundary ◽  
Intergranular Corrosion ◽  
High Strength ◽  
Alkaline Media ◽  
Entire Surface ◽  
Corrosion Tests ◽  
Strength Alloy

In this work, has been performed the characteristics and susceptibility to intergranular corrosion of high strength alloy of AA2024-T3 in alkaline media. Intergranular corrosion can occur randomly over the entire surface of an alloy, but corrosion is limited to the immediate area of the grain boundary and is often not apparent by simple visualization. It can be an important source of limiting the life of the aircraft body where alloys from the 2xxx series are used, which is why they are systematically subjected to intergranular corrosion tests in dedicated laboratories.

SUSCEPTIBILITY AT THE CORROSION OF 7150-T77 ALUMINUM ALLOY USED IN AVIATION INDUSTRY

2019 ◽  
Vol 33 (2) ◽  
pp. 59-65
Author(s):  
Vasile Hotea ◽  
Keyword(s):  
Aluminum Alloy ◽  
Corrosion Test ◽  
High Strength ◽  
Corrosion Testing ◽  
Aviation Industry ◽  
Corrosion Tests ◽  
Exfoliation Corrosion ◽  
Strength Alloy

In this work, has been performed the susceptibility to corrosion on high strength alloy of 7150-T77 at the EXCO corrosion test according to ASTM G34-01 standard which covers a procedure for exfoliation corrosion testing of 7XXX series aluminum alloys.Corrosion it can be an important source of limiting the life of the aircraft body where alloys from the 7xxx series are used, which is why they are systematically subjected to corrosion tests in dedicated laboratories.

Investigation on Fatigue Damage of the Al5Zn2Mg High Strength Aluminum Alloy

2013 ◽  
Vol 721 ◽  
pp. 12-15 ◽  
Author(s):  
Xian Liang Sun ◽  
Ai Qin Tian ◽  
Wen Bin Chen ◽  
San San Ding ◽  
Shang Lei Yang
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Grain Boundary ◽  
Fatigue Fracture ◽  
Low Cycle Fatigue ◽  
High Strength ◽  
Alloy Sample ◽  
Cycle Fatigue ◽  
High Strength Aluminum Alloy ◽  
Propagation Zone

The fatigue fracture and the microstructure of Al5Zn2Mg high strength aluminum alloy were observed by OM, SEM and TEM, and the low cycle fatigue properties were tested and analyzed. The results of experimentation show that the low cycle fatigue life of Al5Zn2Mg high strength aluminum alloy is 9.28×104 cycle in R=0.1, f=8Hz, and σmax=0.75σb. The tensile strength is 444MPa. The fatigue fracture is composed of the initiation zone, the propagation zone, and the sudden fracture zone, which is characteristic of a mixed-type fatigue fracture. The fatigue crack initiates in the surface of Al5Zn2Mg aluminum alloy sample, while there is no fatigue striation in fatigue crack propagation zone. The η′(MgZn2) transitional strengthening phases are precipitated in Al5Zn2Mg aluminum alloy, and mostly distributed in grain boundary. The diameter of η′ strengthening phase is fine, about is 10nm. There is none precipitated zone in width nearby the grain boundary

Investigation of the joinability of the high-strength aluminum alloy AA7075 in shear-clinching processes

2021 ◽  
pp. 146442072110679
Author(s):  
S Wiesenmayer ◽  
M Merklein
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aluminum Alloy ◽  
High Strength ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
High Strength Aluminum Alloy ◽  
Heat Treated ◽  
Strength Alloy ◽  
Heating Up

Shear-clinching has proven to be a suitable technology for joining of high-strength materials. However, the mechanical properties of the upper joining partner are limited due to the high strains, which occur during the process. Therefore, shear-clinching of the high-strength aluminum alloy AA7075 in the T6 temper is not possible. Yet, the mechanical properties of hardenable alloys of the 7000 series can be influenced by a heat treatment. Thus, within the scope of this work, the joinability of the high-strength alloy AA7075 in shear-clinching processes in dependance of its temper is investigated. The as fabricated state F, the artificially aged T6 temper, a paint baked state and the naturally aged T4 temper are compared to the fully solution annealed W temper as well as to a retrogression heat-treated state. For retrogression heat treatment, a laser is used as heat source, heating up the alloy for a short term in order to only partially dissolve precipitations. The resulting mechanical properties are determined with uniaxial tensile tests. Moreover, the influence of the mechanical properties of AA7075 on the shear-clinching process, the joint formation and the resulting joint strength is analyzed.

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