High-strength aluminum-based light-weight materials for safety components – recent progress by microstructural refinement and particle reinforcement

Hockauf, Matthias; Wagner, Martin F.‐X.; Händel, M.; Lampke, Thomas; Siebeck, Steve; Wielage, B.

doi:10.3139/146.110631

Cited by 12 publications

(4 citation statements)

References 49 publications

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“…The results on room temperature properties are published in [1][2][3][4][5][6]. In addition, creep tests were carried out, in which all tested AMCs showed higher creep rates than the unreinforced reference material.…”

Section: Introductionmentioning

confidence: 99%

Influence of Boron on the Creep Behavior and the Microstructure of Particle Reinforced Aluminum Matrix Composites

Siebeck

Roder

Wagner

et al. 2018

Metals

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Abstract:The reinforcement of aluminum alloys with particles leads to the enhancement of their mechanical properties at room temperature. However, the creep behavior at elevated temperatures is often negatively influenced. This raises the question of how it is possible to influence the creep behavior of this type of material. Within this paper, selected creep and tensile tests demonstrate the beneficial effects of boron on the properties of precipitation-hardenable aluminum matrix composites (AMCs). The focus is on the underlying microstructure behind this effect. For this purpose, boron was added to AMCs by means of mechanical alloying. Comparatively higher boron contents than in steel are investigated in order to be able to record their influence on the microstructure including the formation of potential new phases as well as possible. While the newly formed phase Al 3 BC can be reliably detected by X-ray diffraction (XRD), it is difficult to obtain information about the phase distribution by means of scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) investigations. An important contribution to this is finally provided by the investigation using Raman microscopy. Thus, the homogeneous distribution of finely scaled Al 3 BC particles is detectable, which allows conclusions about the microstructure/property relationship.

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Section: Introductionmentioning

confidence: 99%

Influence of Boron on the Creep Behavior and the Microstructure of Particle Reinforced Aluminum Matrix Composites

Siebeck

Roder

Wagner

et al. 2018

Metals

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“…[1] One approach to further improve these properties are processes involving severe plastic deformation (SPD), such as equalchannel angular pressing (ECAP). [2][3][4] The microstructure after SPD processing is often heterogeneous and meta-stable [5][6][7] : the long-term mechanical properties may, therefore, change at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Creep and Aging on the Precipitation Kinetics of an Al–Cu Alloy after One Pass of ECAP

et al. 2017

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Recent work shows that severe plastic deformation processes such as ECAP or HPT considerably accelerate the precipitation kinetics of Al-Cu alloys. In this study, the authors analyze how a combination of mechanical load, aging time (and increased plastic strain), and aging temperature affects the precipitation kinetics of an AA2017 alloy after ECAP. After solution annealing, the material is processed by one pass of ECAP (120 -channel angle) at 140 C. Compressive creep tests are performed on the initial condition and the ECAP-deformed material. The resulting microstructures are studied in detail using electron microscopy. To investigate the influence of mechanical loading, interrupted compressive creep tests are performed and compared with aged samples (produced without any mechanical loading at the same temperature and after the same amount of time). By keeping time and load constant in another set of interrupted compressive creep tests, the influence of temperature is investigated. Our study shows that increasing mechanical loading further accelerates the precipitation kinetics. Temperature accelerates the precipitation kinetics as well, but results in coarser precipitates. The authors also find that different creep strains can lead to the formation of two different regions in the microstructure: regions with only a few coarsened uphase precipitates, and regions with numerous, finely dispersed precipitates.

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“…Subsequently, the compacted raw material is extruded to improve the mechanical properties. Eventually, a T4 heat treatment is applied [26]. Table 1 presents the averaged specific values of relevant mechanical parameters determined by tensile tests in the direction of extrusion.…”

Section: Methodsmentioning

confidence: 99%

Influencing the Properties of the Generated Surface by Adjusted Rake and Clearance Angles in Side Milling of Aluminum Matrix Composites with MCD-Tipped Tools

Clauß

Nestler

Schubert

et al. 2019

JMMP

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The application of aluminum matrix composites (AMCs) allows the reduction of moving loads for increased efficiency in modern technical systems. However, the presence of reinforcing particles leads to challenges in machining of AMCs, typically requiring diamond cutting materials. Single-edged MCD-tipped tools are used to investigate the influence of different clearance and rake angles on the resulting surface properties in milling, while the cutting parameters are kept constant. The specimens are manufactured from an aluminum wrought alloy comparable to EN AW-2017, reinforced with 10 vol.% of SiC particles. The surface properties are evaluated considering the surface structure, the residual stress state, and the microstructure of the surface layer. A clearance angle of the minor cutting edge of about 3 • on average leads to the lowest Rz values and a reduced fluctuation of surface roughness values. Using a tool with a positive rake angle of 5 • entails the highest absolute values of the compressive residual stresses and an increase compared to the initial state of up to about 290%. The results contribute to an understanding of the relations between tool geometry and the generated surface properties required for a targeted enhancement of the functional performance when machining AMCs.

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High-strength aluminum-based light-weight materials for safety components – recent progress by microstructural refinement and particle reinforcement

Cited by 12 publications

References 49 publications

Influence of Boron on the Creep Behavior and the Microstructure of Particle Reinforced Aluminum Matrix Composites

Influence of Boron on the Creep Behavior and the Microstructure of Particle Reinforced Aluminum Matrix Composites

Effect of Creep and Aging on the Precipitation Kinetics of an Al–Cu Alloy after One Pass of ECAP

Influencing the Properties of the Generated Surface by Adjusted Rake and Clearance Angles in Side Milling of Aluminum Matrix Composites with MCD-Tipped Tools

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