Formation of α-approximant and quasicrystalline Al–Cu–Fe thin films

Olsson, Simon; Eriksson, Fredrik; Birch, Jens; Hultman, Lars

doi:10.1016/j.tsf.2012.11.009

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…XRD and GIWAXS Characterization : An in situ annealing XRD measurement was performed using a Philips X'Pert MPD Bragg‐Brentano diffractometer equipped with a Edmund‐Bühler HDK 2.4 high‐temperature high‐vacuum chamber with a Be window . The GIWAXS measurements were carried out at BL23A1 of National Synchrotron Radiation Research Center, Hsinchu.…”

Section: Methodsmentioning

confidence: 99%

A Free‐Standing High‐Output Power Density Thermoelectric Device Based on Structure‐Ordered PEDOT:PSS

Sun

Hsiao

et al. 2018

Adv Elect Materials

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A free‐standing high‐output power density polymeric thermoelectric (TE) device is realized based on a highly conductive (≈2500 S cm−1) structure‐ordered poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate film (denoted as FS‐PEDOT:PSS) with a Seebeck coefficient of 20.6 µV K−1, an in‐plane thermal conductivity of 0.64 W m−1 K−1, and a peak power factor of 107 µW K−2 m−1 at room temperature. Under a small temperature gradient of 29 K, the TE device demonstrates a maximum output power density of 99 ± 18.7 µW cm−2, which is the highest value achieved in pristine PEDOT:PSS based TE devices. In addition, a fivefold output power is demonstrated by series connecting five devices into a flexible thermoelectric module. The simplicity of assembling the films into flexible thermoelectric modules, the low out‐of‐plane thermal conductivity of 0.27 W m−1 K−1, and free‐standing feature indicates the potential to integrate the FS‐PEDOT:PSS TE modules with textiles to power wearable electronics by harvesting human body's heat. In addition to the high power factor, the high thermal stability of the FS‐PEDOT:PSS films up to 250 °C is confirmed by in situ temperature‐dependent X‐ray diffraction and grazing incident wide angle X‐ray scattering, which makes the FS‐PEDOT:PSS films promising candidates for thermoelectric applications.

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Section: Methodsmentioning

confidence: 99%

A Free‐Standing High‐Output Power Density Thermoelectric Device Based on Structure‐Ordered PEDOT:PSS

Sun

Hsiao

et al. 2018

Adv Elect Materials

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“…It should be noted that the face-centered icosahedral quasicrystalline phase was detected through the whole milling process. The traces of the s 5 -Al 7.4 Fe 2 Si phase, one of a ternary s-type phases enriched in Fe and Si [46], has been observed in multilayered Al/Cu/Fe thin films deposited onto Si substrate in the Al-deficient samples, together with the dominating a-Al 55 Si 7 Cu 25.5-Fe 12.5 approximant [47].…”

Section: Discussionmentioning

confidence: 91%

Synthesis and stability of quasicrystalline phase in Al-Cu-Fe-Si mechanically alloyed powders

2021

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The effect of Si addition on a quasicrystalline phase formation in Al-Cu-Fe-Si alloys prepared by mechanical alloying has been investigated using X-ray diffraction and scanning and transmission electron microscopy. Two compositions containing 10 at.% of Si were selected to verify the influence of the e/a ratio on a sequence of phase formation during milling: Al58.5Cu18Fe13.5Si10 (e/a = 1.98) and Al53.5Cu19.5Fe17Si10 (e/a = 1.75). A quasicrystalline icosahedral phase (i-phase) was found in both alloys after 10 h of milling in the form of nano-quasicrystallites with the size of 10–20 nm. Addition of Si stabilized the quasicrystalline phase being dominant after prolonged milling time, contrary to the reference ternary Al65Cu20Fe15 powder, which apart of the quasicrystalline phase contained the cubic β-Al(Cu, Fe) phase. Thermal stability of the quasicrystalline phase in the powders milled for 10 h was examined after annealing at 800 °C for 4 h. The i-phase was preserved partially in Al53.5Cu19.5Fe17Si10 and reference Al65Cu20Fe15 powders (both with a ratio e/a = 1.75), which coexisted with β-Al(Cu, Fe) and Al13Fe4 phase or α-Al55Si7Cu25.5Fe12 and Al2Fe3Si3 phases in Al65Cu20Fe15 and Al53.5Cu19.5Fe17Si10, respectively. For the Al58.5Cu18Fe13.5Si10 powders (e/a = 1.98), the annealing led to complete transformation of the i-phase to the cubic α-Al55Si7Cu25.5Fe12.5 approximant, forming crystallites with a size of 100–300 nm. Graphical abstract

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“…Al-Cu-Fe-based quasicrystalline thin films show exceptional surface and mechanical properties. The direct growth of quasicrystals was reported in multilayer Al-Cu-Fe thin films after subsequent heat treatment [13]. Successful application of Al60Cu28Fe12 quasicrystalline and film coating obtained through three-electrode ionplasma sputtering of assembled targets was reported, and this coating contained a quasi-crystalline 𝑖-phase that was stable up to 723K [14].…”

Section: Introductionmentioning

confidence: 94%

Microstructure and Corrosion Behavior of Al-Cu-Fe Quasi-crystalline Coated Ti-6Al-4V Alloy

Abaei,

Rahimipour,

Farvizi

et al. 2023

IJE

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Different industries, including aerospace, marine, and automotive, widely use titanium alloys such as Ti-6Al-4V. Although, this alloy has excellent properties; it is highly susceptible to corrosion and has low thermal stability and tribological characteristics, limiting its application. In this research, after preparing the Al62.5Cu25Fe12.5 quasi-crystalline (QC) powder mixture and appropriate target, the magnetron sputtering method was employed to deposit the QC coating on the Ti-6Al-4V substrate. The powder mixture and AlCuFe thin films were annealed at 700 0 C for 2 h. The scanning electron microscope (SEM) analysis and X-ray diffraction (XRD) methods were used to investigate the microstructure and morphology of mixed powders and Al-Cu-Fe QC coatings. NaCl solution (3.5 wt.%) was utilized to conduct the electrochemical measurements. Al-Cu-Fe thin layer deposited on the Ti-6Al-4V alloy surface without any cracks. The XRD patterns related to the annealed powders and the coating after heat treatment indicated the presence of Cu3Al, AlFe3, and quasi-crystalline ternary phases of Al65Cu20Fe15, Al3Fe, AlTi2, and Al65Cu20Fe15 phases, respectively. Based on the polarization test results, the annealed coating at 700°C showed better electrochemical behavior than the Ti-6Al-4V substrate.

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Formation of α-approximant and quasicrystalline Al–Cu–Fe thin films

Cited by 9 publications

References 19 publications

A Free‐Standing High‐Output Power Density Thermoelectric Device Based on Structure‐Ordered PEDOT:PSS

A Free‐Standing High‐Output Power Density Thermoelectric Device Based on Structure‐Ordered PEDOT:PSS

Synthesis and stability of quasicrystalline phase in Al-Cu-Fe-Si mechanically alloyed powders

Microstructure and Corrosion Behavior of Al-Cu-Fe Quasi-crystalline Coated Ti-6Al-4V Alloy

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