Effect of Thermo-Mechanically Activated Precipitation on the Hot Deformation Behavior of High Strength Aluminum Alloy AA7075

Scharifi, Emad; Nietsch, Jürgen A.; Quadfasel, Angela; Weidig, Ursula; Steinhoff, Kurt

doi:10.3390/met12101609

Cited by 4 publications

(4 citation statements)

References 42 publications

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“…Δ H fus is the heat of fusion, ρ s is the density of solid, ϕ is the volume fraction of the particles, T m is the melting temperature, T c is the temperature of the cooling fluid, W is the thickness of the compartment holding the n-PCM, k w is the conductivity of the wall, and k′ is the conductivity of the PCM. The thermal conductivity of the plasmonically enhanced PCM materials can be varied with the volumetric fraction of the PCM material and can be specified by [ 95 ]:…”

Section: Reviewmentioning

confidence: 99%

Plasmonic nanotechnology for photothermal applications – an evaluation

Indhu¹,

Keerthana²,

Dharmalingam³

2023

Beilstein J. Nanotechnol.

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The application of plasmonic nanoparticles is motivated by the phenomenon of surface plasmon resonance. Owing to the tunability of optothermal properties and enhanced stability, these nanostructures show a wide range of applications in optical sensors, steam generation, water desalination, thermal energy storage, and biomedical applications such as photothermal (PT) therapy. The PT effect, that is, the conversion of absorbed light to heat by these particles, has led to thriving research regarding the utilization of plasmonic nanoparticles for a myriad of applications. The design of conventional nanomaterials for PT conversion has focussed predominantly on the manipulation of photon absorption through bandgap engineering, doping, incorporation, and modification of suitable matrix materials. Plasmonic nanomaterials offer an alternative and attractive approach in this regard, through the flexibility in the excitation of surface plasmons. Specific advantages are the considerable improved bandwidth of the absorption, a higher efficiency of photon absorption, facile tuning, as well as flexibility in the synthesis of plasmonic nanomaterials. This review of plasmonic PT (PPT) research begins with a theoretical discussion on the plasmonic properties of nanoparticles by means of the quasi-static approximation, Mie theory, Gans theory, generic simulations on common plasmonic material morphologies, and the evaluation processes of PT performance. Further, a variety of nanomaterials and material classes that have potential for PPT conversion are elucidated, such as plasmonic metals, bimetals, and metal–metal oxide nanocomposites. A detailed investigation of the essential, but often ignored, concept of thermal, chemical, and aggregation stability of nanoparticles is another part of this review. The challenges that remain, as well as prospective directions and chemistries, regarding nanomaterials for PT conversion are pondered on in the final section of the article, taking into account the specific requirements from different applications.

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Section: Reviewmentioning

confidence: 99%

Plasmonic nanotechnology for photothermal applications – an evaluation

Indhu¹,

Keerthana²,

Dharmalingam³

2023

Beilstein J. Nanotechnol.

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“…To take account of microstructural effects in process design, the hot deformation and strain hardening behavior of AA7075 in the as-quenched state were investigated to determine the formability behavior during hot compression at high strain rates up to ε : = 10 s À1 . [119,132,133] In [134] in addition, a thermally stabilized condition is used to compare the hardening effects and precipitation-dislocation interactions during hot compression to those in the as-quenched condition. The thermally stabilized condition, obtained by solution heat treatment, water quenching, and artificially aging for 24 h at the intended deformation temperature, was designed to prevent precipitate nucleation and growth during hot compression.…”

Section: Hot Deformation and Hardening Behavior Of Aluminum Alloys At...mentioning

confidence: 99%

“…}{\epsilon} \textrm{ }$= 10 s −1 . [ 119,132,133 ] In [134] in addition, a thermally stabilized condition is used to compare the hardening effects and precipitation–dislocation interactions during hot compression to those in the as‐quenched condition. The thermally stabilized condition, obtained by solution heat treatment, water quenching, and artificially aging for 24 h at the intended deformation temperature, was designed to prevent precipitate nucleation and growth during hot compression.…”

Section: Forming Strategies To Overcome the Forming Limit Of Aluminum...mentioning

confidence: 99%

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

et al. 2023

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In the past decade, aluminum alloys have become important structural materials in the automotive industry, thanks to their low density, high strength, high fracture toughness, and good fatigue performance. However, an important limitation of aluminum alloys is their poor formability at room temperature; as a result, numerous studies have been conducted with the aim of developing forming techniques to overcome this and facilitate the forming of more complex‐shaped components. Following an overview on the metallurgical background of aluminum alloys, this article reviews recent developments in forming processes for aluminum alloys. The focus is on process variants at room temperature and at higher temperatures and on a new hot forming technique promising considerable improvements in formability. This review summarizes the influence of different process parameters on microstructures and mechanical properties. Particular emphasis is given to process design and to the underlying microstructural phenomena governing the strengthening mechanisms.

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“…At ambient conditions, the plastic deformation ability of 7075 aluminum alloys is not entirely satisfactory, and achieving the required forming accuracy for the application is challenging [12,13]. Therefore, hot deformation processes, such as hot rolling, hot extrusion, and hot stamping, are commonly adopted to produce aluminum alloy components [14][15][16]. The exploration of deformation behavior and the related microstructure mechanism of the alloys at higher Materials 2024, 17, 1210 2 of 12 temperature conditions is of great importance for examining workability characteristics, which are beneficial for guaranteeing the precise control of the aluminum alloy component and improving their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of an Extruded 7075 Aluminum Alloy at Elevated Temperatures

Ye,

Xia,

Qiu

et al. 2024

Materials

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Hot compression tests were conducted to explore the deformation behavior of an extruded 7075 aluminum alloy bar at elevated temperatures. Specimens with 0°, 45°, and 90° angles along the extrusion direction were prepared. The compression temperatures were 300 and 400 °C, and the strain rates ranged from 0.001 to 0.1 s−1. The corresponding microstructures were characterized via OM and TEM, and the macroscopic texture was tested using XRD. The results indicated that the strength of the 7075 alloy decreases with higher compression temperatures and is in a proportional relationship with respect to the strain rate. During high-temperature compression, it is easier to stimulate atomic diffusion in the matrix, which can improve thermal activation abilities and facilitate dynamic recovery and dynamic recrystallization. In addition, the coarsening of precipitates also contributed to dynamic softening. When compressed at 300 °C, the stress levels of the 0° specimens ranked first, and those for the 45° specimens were the lowest. When compressed at 400 °C, the flow stresses of the specimens along three directions were comparable. The anisotropic mechanical behavior can be explained by the fiber grains and brass {011} <211> texture component. However, higher temperature deformation leads to recrystallization, which can weaken the anisotropy of mechanical properties.

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Effect of Thermo-Mechanically Activated Precipitation on the Hot Deformation Behavior of High Strength Aluminum Alloy AA7075

Cited by 4 publications

References 42 publications

Plasmonic nanotechnology for photothermal applications – an evaluation

Plasmonic nanotechnology for photothermal applications – an evaluation

Hot Sheet Metal Forming Strategies for High‐Strength Aluminum Alloys: A Review—Fundamentals and Applications

Deformation Behavior of an Extruded 7075 Aluminum Alloy at Elevated Temperatures

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