Understanding the ductility versus toughness and bendability decoupling of large elongated and fine grained Al 7475 - T6 alloy

Lezaack, Matthieu B.; Hannard, Florent; Simar, Aude

doi:10.1016/j.msea.2022.142816

Cited by 10 publications

(9 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen from Figure 3 that the fraction of <001> oriented grains of the copper foil after annealing for 60 min is 95.2%, showing relatively consistent grain orientation. Grain orientation is also one of the important symbols of bending resistance performance [ 31 ]. The more concentrated the preferred orientation of the grains, the smaller the orientation difference between adjacent grains [ 32 , 33 ].…”

Section: Discussionmentioning

confidence: 99%

Softened Microstructure and Properties of 12 μm Thick Rolled Copper Foil

et al. 2022

View full text Add to dashboard Cite

Up to now, 12 μm thick rolled copper foil is the thinnest rolled copper foil that can be stably produced. The softened microstructure and properties of 12 μm thick rolled copper foil were systematically studied in this paper. The softened process consists of thermal treatment at 180 °C for different times. The results show that the softened annealing texture is mainly cubic texture, and the cubic texture fraction increases with the increase in annealing time. The cubic texture fraction reaches the highest (34.4%) after annealing for 60 min. After annealing for 1–5 min, the tensile strength and the bending times decrease significantly. After annealing for 10–60 min, the tensile strength tends to be stable, and the bending times increase slightly. With the increase in annealing time, the electrical conductivity increases gradually, reaching 92% International Annealed Copper Standard (IACS) after annealing for 60 min. Electrical conductivity can be used as a fast and effective method to analyze the microstructure of metals.

show abstract

Section: Discussionmentioning

confidence: 99%

Softened Microstructure and Properties of 12 μm Thick Rolled Copper Foil

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The AA7475 aluminum alloy is a good combination of high strength and superior fatigue crack growth resistance when compared with AA7050 and AA7075 in comparable tempers [ 2 , 3 , 4 ]. The AA7475 alloy originates from AA7075 and AA7175 aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The typical fracture toughness values for AA7475 alloy plate are around 40% higher when compared to those of AA7075 alloy in the same tempers [ 2 ]. According to a recent publication, it is possible to attain a fracture toughness (K IC ) value of 65.2 MPa√m and a critical stress intensity factor (K ISCC ) of 37.9 MPa√m for 7X75 alloy in the T73 temper [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Retrogression Time on the Fatigue Crack Growth Behavior of a Modified AA7475 Aluminum Alloy

Yang

Tang

et al. 2023

Materials

View full text Add to dashboard Cite

This paper investigates the effect of retrogression time on the fatigue crack growth of a modified AA7475 aluminum alloy. Tests including tensile strength, fracture toughness, and fatigue limits were performed to understand the changes in properties with different retrogression procedures at 180 °C. The microstructure was characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The findings indicated that as the retrogression time increased, the yield strength decreased from 508 MPa to 461 MPa, whereas the fracture toughness increased from 48 MPa√m to 63.5 MPa√m. The highest fracture toughness of 63.5 MPa√m was seen after 5 h of retrogression. The measured diameter of η’ precipitates increased from 6.13 nm at the retrogression 1 h condition to 6.50 nm at the retrogression 5 h condition. Prolonged retrogression also increased the chance of crack initiation, with slower crack growth rate in the long transverse direction compared to the longitudinal direction. An empirical relationship was established between fracture toughness and the volume fraction of age-hardening precipitates, with increasing number density of precipitates seen with increasing retrogression time.

show abstract

“…7xxx Al alloys are heat-treatable alloys and can be strengthened through homogeneous precipitation of MgZn 2 precipitates, up to a yield strength over 500 MPa in peak-aged (T6) condition [ 1 , 2 ]. However, strength and ductility are generally mutually exclusive and the lack of ductility of 7xxx Al alloys, when compared to other series of Al alloys, remains an important challenge for their applicability [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…In terms of bending formability, micro-cracks initiation on the outer tensile bend surface was delayed in the FSPed material compared to the base material. However, small FSPed grains (around 3 μm) favoured an intergranular failure mode, leading to fast crack propagation during bending [ 3 ]. These two opposite effects explained that the bending formability of the FSPed material was not improved compared to the base material, despite a significant improvement in terms of tensile ductility.…”

Section: Introductionmentioning

confidence: 99%

On the Competition between Intergranular and Transgranular Failure within 7xxx Al Alloys with Tailored Microstructures

et al. 2023

Self Cite

View full text Add to dashboard Cite

7xxx aluminium series reach exceptional strength compared to other industrial aluminium alloys. However, 7xxx aluminium series usually exhibit Precipitate-Free Zones (PFZs) along grain boundaries, which favour intergranular fracture and low ductility. In this study, the competition between intergranular and transgranular fracture is experimentally investigated in the 7075 Al alloy. This is of critical importance since it directly affects the formability and crashworthiness of thin Al sheets. Using Friction Stir Processing (FSP), microstructures with similar hardening precipitates and PFZs, but with very different grain structures and intermetallic (IM) particle size distribution, were generated and studied. Experimental results showed that the effect of microstructure on the failure mode was significantly different for tensile ductility compared to bending formability. While the tensile ductility was significantly improved for the microstructure with equiaxed grains and smaller IM particles (compared to elongated grains and larger particles), the opposite trend was observed in terms of formability.

show abstract

Understanding the ductility versus toughness and bendability decoupling of large elongated and fine grained Al 7475 - T6 alloy

Cited by 10 publications

References 22 publications

Softened Microstructure and Properties of 12 μm Thick Rolled Copper Foil

Softened Microstructure and Properties of 12 μm Thick Rolled Copper Foil

Influence of Retrogression Time on the Fatigue Crack Growth Behavior of a Modified AA7475 Aluminum Alloy

On the Competition between Intergranular and Transgranular Failure within 7xxx Al Alloys with Tailored Microstructures

Contact Info

Product

Resources

About