Article
Chemistry, Multidisciplinary
Jose F. Gomez-Cortes, Maria L. No, Andrey Chuvilin, Isabel Ruiz-Larrea, Jose M. San Juan
Summary: Cu-Al-Ni is a high-temperature shape memory alloy (HTSMA) that exhibits exceptional thermomechanical properties and is suitable for high-temperature MEMS/NEMS technologies. Recent studies have shown that this alloy has robust superelastic behavior at the nanometer scale, making it a good choice for developing new generations of micro-/nano-electromechanical systems. The experimental results indicate that the Cu-Al-Ni thin films produced by solid-state diffusion have high thermal stability, which is suitable for the development of high-temperature MEMS/NEMS.
Article
Materials Science, Coatings & Films
Anni Wang, Manuel Oliva Ramirez, Maria Caplovicova, Viliam Vretenar, Julius Boettcher, Marcus Hopfeld, Thomas Kups, Dominik Flock, Peter Schaaf
Summary: This study presents the synthesis of High Entropy Alloy films through rapid thermal processing, resulting in a duplex FCC structure containing various phases with intensive nano-twins. As the annealing temperature increases, the oxygen content decreases in the films, while both HEA and Cu phases exhibit significant preferred orientations. The grain growth kinetics of HEA phase were evaluated, showing an activation energy comparable to conventional stainless steel and less than half of CrCoFeNi bulk value.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Phillip Dumitraschkewitz, Matheus A. Tunes, Cameron R. Quick, Diego Santa Rosa Coradini, Thomas M. Kremmer, Parthiban Ramasamy, Peter J. Uggowitzer, Stefan Pogatscher
Summary: The solidification behavior of a eutectic AlCu specimen is investigated using in situ scanning transmission electron microscope experiments. By varying the cooling conditions, different rapid solidification morphologies are obtained. Additionally, the spheroidization of lamellas during annealing at elevated temperatures is studied.
Article
Energy & Fuels
Gaoyuan Ouyang, Chaochao Pan, Benjamin Hilliard, Agata Czernuszewicz, Julie Slaughter, Jun Cui
Summary: Cu-Al-Mn alloys have martensitic transformation properties over a wide temperature range. By rapid solidification, the ductility of Cu-Al-Mn can be increased, making it suitable for elastocaloric applications. Heat treatment promotes bamboo grain formation and increases the latent heat.
JOURNAL OF PHYSICS-ENERGY
(2023)
Article
Chemistry, Physical
Khushubo Tiwari, Manas Paliwal, Miral Verma, Krishanu Biswas
Summary: TEM investigation revealed the formation of three distinct phases within the nanoparticles; DSC analysis showed a sharp melting peak but no distinct exothermic peak during cooling; experimental results indicated extensive undercooling is required for complete solidification of the nanoparticles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Feng Han, Hua Han, Yu Zhang, Tao Yuan, Caimei Wang
Summary: This study reveals the formation mechanism of the quaternary quasicrystal phase in the Al-Cu-Mg-Zn alloy resistance spot welding nugget. The quasicrystal phase is located at the inner-dendrite zone and exhibits the typical pattern of an icosahedral quasicrystal. It is found that the undercooled remnant liquid forms the icosahedral quasicrystal phase due to the rapid cooling rate of resistance spot welding. This study demonstrates the feasibility of acquiring a massive quasicrystal phase in commercially-used aluminum alloy under common processing conditions.
Article
Chemistry, Physical
Pinhui Lv, Richu Wang, Chaoqun Peng, Zhiyong Cai, Yan Feng, Xiaofeng Wang
Summary: Pre-strain deformation before artificial aging is preferred for fabricating high-performance Al-Cu-Li alloy plates. The precipitation and mechanical properties of rapidly solidified Al-Cu-Li alloy as a function of pre -rolling deformation from 4% to 20% were investigated. The increase in pre-rolling deformation leads to higher dislocation density, providing more nucleation sites for the T1 phase, resulting in higher density and finer diameter of the T1 phase in grains and mitigated enrichment of T1 phase at the subgrain boundaries. Meanwhile, more T1 phase consumes more Cu atoms, suppressing the precipitation of the 0' phase. The yield strength of the alloy increases with the pre-rolling deformation, reaching a maximum value of 641.6 MPa after 20% pre-rolling, attributed to strain hardening and precipitation strengthening. The strengthening contribution of the T1 phase decreases with increasing pre-rolling deformation, while the increase in yield strength is due to larger strain hardening from high levels of pre-rolling deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Ning Fang, Chunming Zou, Zunjie Wei, Hongwei Wang, Rong Zhang, Zheng Ran, Tao Chang
Summary: Increasing solidification pressure leads to reduced SDAS and transformation of eutectic Si morphology in Al alloys. The high pressure promotes the formation of nano-sized particles, enhances hardness and compressive strength, with alloys solidified at 4 GPa showing the highest mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Shaohua Wu, Mitsuhiro Okayasu, Tatsuya Kuwada
Summary: The microstructural characteristics of a conventional Al-Si-Cu alloy (ADC12) material were found to be dependent on the amount of Si present during solidification, resulting in different crystal structures and morphologies. Higher silicon concentrations led to coarser microstructures, while lower silicon content resulted in more orderly and smaller crystal growth.
INTERNATIONAL JOURNAL OF METALCASTING
(2021)
Article
Materials Science, Multidisciplinary
Gaoliang Shen, Zhilei Xiang, Xiaozhao Ma, Jingcun Huang, Yueqing Zhao, Jihao Li, Zhitian Wang, Guodong Shi, Ziyong Chen
Summary: This study prepared a high-strength Al-Zn-Mg-Cu aluminum alloy using rapid solidification and hot extrusion, and analyzed the improvement mechanism of the alloy's microstructure. The results showed that rapid solidification technology could significantly refine the alloy grain. After hot extrusion, the alloy partially recrystallized and formed coarse second-phase and needle-shaped precipitates. After T6 heat treatment, the alloy's tensile strength reached 635.8 MPa, but the elongation decreased to 10.5%. It was found that precipitation strengthening was the main strengthening mechanism.
Article
Materials Science, Multidisciplinary
Xuping Wu, Honglei Chen, Xuemei Luo, Dong Wang, Peter Schaaf, Guangping Zhang
Summary: A cost-effective strain sensor with ultrahigh strain sensitivity has been designed based on submicron to nanoscale voided clusters in Cu-Al alloy films. The formation of channel cracks in the film is manipulated by regulating the intrinsic microstructure, leading to high gauge factors. This work showcases a novel approach for optimizing the sensing performance of flexible strain sensors.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
Matias Haapalehto, Tatu Pinomaa, Lei Wang, Anssi Laukkanen
Summary: The rapid solidification kinetics of dilute Al-Cu alloys were simulated using a quantum mechanics based bond-order potential (BOP). The study investigated the kinetic and thermodynamic properties of solidification, as well as point defects and chemical ordering of the solidified structures. The results are important for quantitative parametrization of larger scale solidification modeling techniques.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Xinbiao Wang, Yaojun Lin, Zhibo Liu, Shengfa Liu
Summary: This research aims to reduce the amount and size of Al-Mg intermetallic phases by rapid solidification and improve the strength and ductility of a cast Al-15 wt% Mg alloy. The results show that the alloy processed by twin-roll casting (TRC) has refined Al grains and refined granular Al3Mg2 particles, as well as increased Mg solid solubility and decreased amount of Al3Mg2 phase. The TRC Al-15 wt% alloy exhibits higher yield strength, ultimate tensile strength, and uniform elongation compared to the conventionally mold cast counterpart.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Thermodynamics
Wang Shaoyu, Wang Zijie, Wang Shuolin, Yang Yanru, Huang Congliang, Wang Xiaodong
Summary: The kinetics of Al-Ni and Cu-Ni nanodroplets spreading on a Cu substrate with a temperature difference between them were studied using molecular dynamics simulations. The simulations revealed that significant dissolution reactions occurred in both systems and no precursor film was formed during spreading. The spreading rate of nanodroplets in the Al-Ni/Cu wetting systems increased when they contained fewer Ni atoms, while in the Cu-Ni/Cu wetting systems, the spreading rate remained unchanged regardless of the Cu to Ni ratio due to their similar lattice constants. The simulations also showed that local solidification occurred in the later spreading stage due to the temperature gradient, hindering the spreading process.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yong Yu, Xiaoping Cai, Zhichao Shang, Yang Yu, Xiaohong Wang, Peizhong Feng
Summary: Three-dimensional continuous micro/nano porous Cu/Cu2O particles were successfully prepared using rapid powder sintering and dealloying. The particles can control the corrosion intensity through self shedding, resulting in bimodal pore size micron particles. The addition of MNPC, with eutectic point composition and particle morphology, greatly improved the degradation rate of MO from 1.4% to 86% within 10 min in a dark ultrasonic environment.
MATERIALS CHARACTERIZATION
(2023)
