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Among metal-based phase change materials (PCMs), Al and its alloys have garnered significant attention due to their high latent heat and high thermal conductivity. However, challenges such as leakage, corrosion, and oxidation have limited their widespread application.
Al–Ni alloy-based core-shell type microencapsulated phase change material for high temperature thermal energy utilization. Solar Energy Materials and Solar Cells, Vol. 246, 2022, id. 111874. 10.1016/j.solmat.2022.111874 Search in Google Scholar
The Al–Ag phase diagram of Fig. 1 a has a total of sixteen fields, including elemental Ag at 0 and elemental Al at 100. Phase properties analysis shows six single phases, namely the liquid phase, fcc_Ag, cub_A13, hcp_A3, bcc_A2, and fcc_Al phases.
The Al–Ag alloy is a binary system whose phase diagram has been analysed by several researchers using different experimental techniques [6, 7, 8]. Unfortunately, these works are old with a lot of discrepancies in the results reported.
As the latent heat and thermal conductivity are the pivotal properties for the PCM used in solar thermal energy industry, the results of this paper indicate that Al and Si based materials can provide large heat storage and fast charging and discharging. 5. Conclusions
The formation of precipitates or oxides due to the change in cycling rates (which may be a requirement of the storage system) may change the alloy characteristics, and therefore melting and solidification temperatures as well as the enthalpy.
Abstract Among metal-based phase change materials (PCMs), Al and its alloys have garnered significant attention due to their high latent heat and high thermal conductivity. ... Encapsulation Strategies, and Applications of Al and Its Alloy Phase Change Materials for Thermal Energy Storage: A Comprehensive Review. Chenwu Shi, Chenwu Shi. Faculty ...
This paper discusses the considerations for the use of metal and metal alloys as phase change materials for high temperature thermal storage applications, as well as …
The temperature phase diagram stability and physical properties of a binary Silver–Aluminium (Al–Ag) alloy system have been calculated using Thermo-Calc 2021b …
In phase-change alloys, chalcogen LP p-electrons are used to form dative covalent bonds 25,26 and their role in the phase-change process has been largely neglected. In the crystalline phase, GeTe ...
Also utilising the latent heat of SiO 2 encapsulated metal and alloy PCMs of different phase change temperatures, Su and co-workers demonstrated the capability of barcoding. 111 At each melting temperature (peak of melting) the measured latent heat is written as 1 if the heat flux is detectable and otherwise as 0. In this way, they proved the concept of coding using thermal …
This new library consists of 500 substances along with nine associated properties such as phase change temperature, solidification temperature, maximum operation …
A copper–germanium alloy (Cu–Ge alloy) was examined as a phase change material, at temperatures exceeding 600°C, for latent heat storage in solar thermal app...
1 Introduction. Artificial intelligence and big data analytics require continued advances in data storage and processing. Emerging electronic materials, such as phase-change materials (PCM), [1-10] resistive-switching oxides, [] spintronic materials, [] as well as two-dimensional (2D) materials, [] are being heavily investigated for the development of non-volatile …
Review on thermal energy storage with phase change: materials, heat transfer analysis and applications
In addition, solid–liquid phase change in the Zn-30 wt%Al alloy occurred at 429.8–508.5 °C (Fig. S1). Peaks in the temperature range of 437–513 °C are due to the latent heat generated during phase transformation. The integrated values of each peak represent the heat capacity of the eutectoid reaction or of phase transformation.
Chen, X., Zheng, Y., Zhu, M. et al. Scandium doping brings speed improvement in Sb 2 Te alloy for phase change random access memory application. Sci Rep 8, 6839 (2018 ...
The strongest supersaturation of Mg in the α phase (20.8%) was observed for bulk Mg concentrations up to 40%. At 30% Mg, the γ phase formed in quantities detectable by XRD; it became the dominating phase for higher Mg concentrations. No β phase (Al 3 Mg 2) was detected in the mechanical alloys. The observed Al solid solution generally had a ...
In certain specialty alloys, phase changes can cause the metal to remember its former shape. This is seen specifically "shape-memory alloys" such as the nickel-titanium alloy called "Nitinol." Nitinol (an acronym for Nickel Titanium Naval Ordnance Laboratories where the alloy was discovered) is an alloy of nickel and titanium in
Nevertheless, according to phase diagrams, this situation can be improved by (1) adjusting alloy compositions, e.g. decreasing Al composition to β-γ two phase regions; or (2) …
Phase-change memories (PCM) are associated with reversible ultra-fast low-energy crystal-to-amorphous switching in GeTe-based alloys co-existing with the high stability of the two phases at ...
A recent study has found that in the alloy-like phase mode, the addition of a third component with high luminescent efficiency, similar CT state energies with the host binary, and good …
The use of paraffin, salts and salt hydrates as phase change materials (PCMs) have been researched extensively and used in a number of commercial applications. However, metals and metal alloys, which possess a high storage density on a volume basis as well as a substantially higher thermal conductivity, has received much less attention.This paper …
where temperature T is in °C.. Figure 5B shows the temperature dependence of thermal diffusivity, λ and conductivity κ for the CuGe40 alloy. The standard deviations of the measured thermal diffusivity were 1.26 × 10 − 2 @500°C and 1.50 × 10 − 1 @800°C for CuGe40. The values of thermal diffusivity decreased with increasing temperature in the solid phase at …
The present study concerns a fully metallic solid-liquid composite Phase Change Material based on an Al–Sn Miscibility Gap Alloy produced by powder metallurgy, including its ball-milling, compression and further sintering heat treatment. ... Nanofluid based on self-nanoencapsulated metal/metal alloys phase change materials with tuneable ...
Carnot batteries, a type of power-to-heat-to-power energy storage, are in high demand as they can provide a stable supply of renewable energy. Latent heat storage (LHS) using alloy-based phase change materials (PCMs), which have …
Similarly heat treatment process, chemical composition of NiTi alloy plays an important role for phase transformation behavior because of 0.1 % Ni composition changes the transformation temperature up to 200 C. Changes in phase transformation due to variation of Ni composition NiTi alloys are listed in Table 4. Table 4.
The effect of high-energy electropulsing treatment (EPT) on the microstructure evolution, mechanical properties, and fracture behavior of as-treated Ti–6Al–4V alloy strips was investigated. EPT was found to accelerate phase transition and microstructure evolution of quasi-single-phase titanium alloy strips at a relatively low temperature, and obtain characteristic …
The phase diagram can be used to select the appropriate alloy composition and processing conditions to suppress primary silicon formation and enhance the overall performance of the alloy. The Al-Si phase diagram also provides …
Additionally, due to the phase change, the volume of the Al-Cu alloy core expands, leading to voids between the alloy and the surface oxide shell upon cooling. Furthermore, it is evident from Fig. 8 a3 − d3 that the content of O element on the surface of the MEPCMs increases as the calcination temperature rises.
Among metal-based phase change materials (PCMs), Al and its alloys have garnered significant attention due to their high latent heat and high thermal conductivity. …
Compared with other PCM compositions, PCMs with lower melting point metals or alloys have high energy storage density, high thermal conductivity, low subcooling during phase change, small volume change during melting, small phase segregation, and stable physical and chemical properties [15, 16].Also, alloys have higher energy storage density, which allows …
However, the phase change temperature of AM-CPCM increased, possibly due to the addition of the skeleton material TiO 2, which hindered the heat transfer of the PCM and thus affected the phase change behaviors. Additionally, after the initial microencapsulation, the latent heat of the PCM decreased from 156.8 J/g to 55.47 J/g during the melting ...
Lithiation of the solid solution alloy phase facilitates the freshly generated Li atoms at the surface to sink into the metal foil, while the reversible alloy phase change is companied by the dealloying reaction during delithiation, which extracts Li atoms from inside of the metal foil.