Light-Alloy Melt Ultrasonication: Shorter T6 with Higher Precipitation Strengthening

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An A356 alloy is a classic casting light alloy, which is able to be processed into complex geometrical shapes with tailored static and dynamic mechanical properties. As a promising material to reduce fuel and energy consumption in future vehicle designs, there is an interest in understanding the impact of heat treatments on the damping capacity of this alloy. The Granato–Lücke theory is used to detail the forced vibration response in gravity cast A356. It is shown that a solution treatment enhances damping capacity in lower stress states (i.e., strain-independent regime) due to the increase in weak pinning length. However, in high-stress states (i.e., strain-dependent regime), peak-aged (T6) samples display higher damping capacity. This is proposed to be originated by releasing dislocations from weak pinning points, which start bowing in the precipitates that act as strong pinning points. Based on these results, it is shown for the first time that the selection of heat treatments to optimize damping in forced vibration is highly dependent on the expected stress–strain state and must be considered in the design of cast components.

Section: 𝜎 = 𝜎 + 𝜎 + 𝜎mentioning

confidence: 99%

Section: 𝜎 = 𝑐 𝑓 〈𝑟〉 → 〈𝑟〉 < 𝑟mentioning

confidence: 99%

The Influence of Precipitation Hardening on the Damping Capacity in Al–Si–Mg Cast Components at Different Strain Amplitudes

Carneiro

Grilo²,

Soares³

et al. 2022

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“…The strength of the material is inversely proportional to the grain size [44]. Therefore, with a finer grain of the ingot, better mechanical properties can be obtained [45]. furthermore.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effects of High-Intensity Ultrasound on the Microstructure and Mechanical Properties of 2195 Aluminum Ingots

Jiang

et al. 2021

The microstructural refinement of 2195 aluminum alloy ingots is particularly important for improving their industrial applications and mechanical properties. Combined with vacuum casting and inert gas protection, scalable high-strength ultrasonic melt processing (USMT) technology was used to manufacture 2195 aluminum alloy cylindrical ingots. Then, the influence of USMT on the main microstructural components (primary α-Al grains, secondary phase network, and precipitated particles) was studied. Our experiments show that the main microstructure of the ingot was improved after the introduction of ultrasound. Compared to the ingot formed without USMT, the size and morphology of the primary α-Al phase were optimized. The agglomeration of coarsening secondary phases can be alleviated, and the large layered secondary phase network becomes discontinuous throughout the ingot under USMT. At the same time, the mechanical properties of the solidified aluminum alloy ingots were also tested, and comparisons were made between samples formed with and without USMT. The results show that the stress concentration caused by the large area of coarse secondary phase in the ingot leads to the decrease of mechanical properties.

“…Current developments on the processing of aluminium alloys are frequently related to melt (e.g., alloying, degassing, refinement and modification) [26][27][28][29], solid (e.g., precipitation/work hardening, forming/machining) [30][31][32][33][34] and hybrid (powder metallurgy and additive manufacturing) [35,36] processes. However, some authors suggest that conventional alloys themselves have reached their limit in terms of mechanical properties has been spreading inside the scientific community [37].…”

Section: Introductionmentioning

confidence: 99%

Manufacturing Methodology on Casting-Based Aluminium Matrix Composites: Systematic Review

Grilo

Carneiro

Teixeira

et al. 2021

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Ongoing industrial demand for lightweight materials has spiked the research interest in aluminium-based metal matrix composites for its specific properties. The amount of scientific publication available on the matter has led to the vast production of knowledge, which highlights the need for a systematic assessment if further progress is expected. In this paper, a systematic review of the published literature is conducted, according to the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses, on the Scopus and Web of Science databases were used in the literature search, which was completed on the 29 August 2020. The data of the research work is structured in the particle pre-processing stage and the melt processing stage. The present review clarifies the combined pair-wise effect of particles and the melt treatment performed on their wettability or dispersive or de-agglomerative capability, which allows to achieve their final mechanical properties.