Article
Nanoscience & Nanotechnology
T. T. Sasaki, J. Y. Lin, P. Yi, Z. H. Li, S. E. Prameela, A. Park, E. Lipkin, A. Lee, M. L. Falk, T. P. Weihs, K. Hono
Summary: In this study, the deformation-induced precipitation of G.P. zones in Mg-9Al and Mg-5 Zn alloys during equal channel angular extrusion has been reported. Atom probe tomography and hybrid molecular dynamics/Monte Carlo simulations suggest that strategic control of atomic-scale defects can generate novel microstructures, thereby strengthening the deformed Mg alloys.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Ling Ou, Lin-Yan Li, Fan-Cai He, Yu-Feng Nie, Shi-Chen Li
Summary: Using first-principles calculations, the energetics of Guinier-Preston zone (GPZ) formation in response to external strain in the Al-Cu system was systematically investigated. The results showed that when the applied strain exceeded a certain threshold, the precipitation of GPZ preferentially occurred parallel (perpendicular) to the direction of tensile (compressive) strain, and the precipitation energy of GPZ had a parabolic relationship with the magnitude of strain. The variation of precipitation energy was related to the misfit between GPZ and the matrix, which affected the number of bonding electrons below the Fermi level.
Article
Engineering, Industrial
Yanyuan Zhou, Fengchun Jiang, Zhenqiang Wang, Jinyong Chen
Summary: In this paper, the electropulsing (EP) technique was used to enhance the ultrasonic additive manufacturing (UAM) capability of metals. The microstructure and mechanical properties of Cu/Al laminated metal composites (LMCs) produced by EP-UAM and preheating (PH) assisted UAM were compared. The results showed that EP-UAM promoted the plastic flow of Al near the Cu/Al interface, offsetting the negative influence of no-preheating, and induced atomic diffusion and formation of intermetallic compounds more effectively than PH-UAM.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Hiroshi Miyoshi, Hajime Kimizuka, Akio Ishii, Shigenobu Ogata
Summary: The study evaluated the precipitation process of GP zones in Al-Cu alloys, proposing a nucleation theory model for different zone types (GP1 and GP2) that aligns with experimental observations. The results illustrate the competing nucleation mechanisms between GP1 and GP2, providing guidance for tailoring aging conditions to achieve desired mechanical properties for specific applications.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Hongmei Jin, Di Tie, Renguo Guan
Summary: This study investigates the re-precipitation behavior of Al-Mg-Si-Cu alloy at the atomic scale, revealing the beneficial effects of re-precipitation on electrical conductivity and mechanical properties. Additionally, a unique L phase precursor was discovered.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Jian Wang, Jingpei Xie, Zhiyi Liu, Aiqin Wang, Wenyan Wang
Summary: This study investigated the effects of artificial aging temperature on the mechanical properties and precipitation behavior of a pre-strained Al-Cu-Mg-Ag alloy. The results showed that a higher aging temperature can increase the precipitation kinetics of Omega phase and inhibit the precipitation of theta' phase.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Physical
R. Besson, S. Macaluso, L. Thuinet
Summary: This study focuses on investigating the properties of Al/TiB2 heterophase interfaces using atomic-scale calculations, offering a new methodology to clarify ambiguities and provide more realistic values of coherent interface energies.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Kewei Xie, Jinfeng Nie, Chang Liu, Wenhao Cha, Ge Wu, Xiangfa Liu, Sida Liu
Summary: Thermal stability is crucial for maintaining the performance of materials at desired service temperatures. This study successfully fabricated an ultra-strong and heat-resistant Al-Cu composite with nano-AlN and submicron-Al2O3 particles uniformly distributed in the matrix. At 350°C, the composite exhibited high strength (187 MPa) and good ductility (4.6%). The high strength and good ductility were achieved through the strong pinning effect of uniformly dispersed nano-AlN particles on dislocation motion and grain boundary sliding, as well as the precipitation of Guinier-Preston (GP) zones, which enhanced strain hardening during plastic deformation. This work expands the potential applications of Al-Cu composites at service temperatures as high as 350°C.
Article
Chemistry, Physical
Patrick Shower, Jonathan Poplawsky, Sumit Bahl, Amit Shyam
Summary: Si content in ACMZ alloys plays a crucial role in high temperature microstructural stability, with an optimal range of Si content improving aging response and thermal stability. The study utilized hardness testing, SEM, and APT to investigate the relationship between Si content and aging effects in ACMZ alloys. An optimal Si level reduces the density of nucleation sites for precipitates, leading to larger, more stable precipitates that enhance thermal stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Liu Yang, Xiaosong Jiang, Hongliang Sun, Yali Zhang, Yongjian Fang, Rui Shu
Summary: The Cu-11Al-3Ni-2.5Mn-1Y alloy was subjected to aging treatment at different temperatures, and its phase composition, microstructure, mechanical, and damping properties were characterized. The alloy showed a combination of 18 R martensite and 2 H martensite after aging treatment, with the best properties obtained at 450 degrees C. The strengthening mechanisms involved lattice distortion, dislocation increment effect, shearing and hindering effect of precipitated phases and dislocations, fine grain strengthening effect, and an increase in large angle grain boundary.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zhe Wang, Zijian Li, Shangguo Liu, Liqiang Hou, Xiaoqian Wei, Xien Liu, Qing Qin
Summary: Heterogeneous interface engineering can enhance the activity and tune the selectivity of catalysts by inducing surface strain and interfacial charges transfer. In this study, a novel In2O3/Cu heterojunction catalyst with 3D succulents-like morphology significantly improves the selectivity and activity for electrochemical conversion of CO2 to HCOOH.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Torsten E. M. Staab, Frank Lotter, Uwe Muhle, Mohamed Elsayed, Danny Petschke, Thomas Schubert, Alaa M. Ibrahim, Reinhard Krause-Rehberg, Bernd Kieback
Summary: The mechanical properties of Aluminium-copper alloys of the 2xxx type are achieved through the formation of copper-rich precipitates during hardening. The size, distribution, and crystal structure of these precipitates determine the final strength of the alloys. The addition of trace elements, such as In, Sn, and Pb, significantly affects the decomposition behavior of the copper atoms during ageing, with In showing a retarding effect on clustering compared to Sn additions and Pb showing nearly no effect.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Zhengqing Liu, Peipei Ma, Yong Jiang, Yiren Wang, Chunhui Liu
Summary: This study combines first-principles calculations and scanning transmission electron microscopy to investigate nano-features in an aged Al-Cu-Li-Zr alloy. Excess Li is found to segregate to the early-precipitated beta'(L1(2)-Al3Zr) nano-phase and form a tentative delta'(L1(2)-Al3Li) shell. These findings provide insights into experimental observations and have implications for the design of Al-Li alloys.
Article
Chemistry, Physical
Na Ta, Muhammad Umer Bilal, Ines Haeusler, Alaukik Saxena, Yueh-Yu Lin, Felix Schleifer, Michael Fleck, Uwe Glatzel, Birgit Skrotzki, Reza Darvishi Kamachali
Summary: The study investigates the effects of anisotropic interfacial properties and heterogeneous elasticity on the growth and ripening of plate-like theta'-phase in Al-Cu alloy. The results show that anisotropic interfacial mobility and energy significantly affect the aspect ratios of precipitates, while the chemo-mechanical coupling plays a role in the precipitation process. However, the inverse ripening phenomenon observed in another alloy system does not occur for theta'-phase precipitates due to anisotropic stress fields and interactions among different variants.
Article
Chemistry, Physical
Jian Wang, Jingpei Xie, Zhiping Mao, Tingting Liang, Aiqin Wang, Wenyan Wang, Shiming Hao
Summary: The effect of non-isothermal aging treatment on the Al-Cu-Mg-Ag alloy was investigated. The size and density of the omega phase were modified, improving the mechanical properties of the alloy. The precipitation of the omega phase was promoted and the aging time was shortened by the non-isothermal aging treatment. Interestingly, the size distribution of omega plates shifted to larger values with increasing heating rate during the treatment. (c) 2023 Elsevier B.V. All rights reserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
