C.T. Liu
City University of Hong Kong
Particle physicsUltimate tensile strengthAnalytical chemistryPhysicsAmorphous metalEmbrittlementComposite materialMetallurgyMaterials scienceIntermetallicAlloyNialHigh entropy alloysPhase (matter)Grain boundaryAmorphous solidDuctilityCrystallographyMicrostructureThermodynamics
Publications 725
#1Wanpeng Li (CityU: City University of Hong Kong)H-Index: 5
#2Tzu-Hsiu Chou (CityU: City University of Hong Kong)
Last. Fu-Rong Chen (CityU: City University of Hong Kong)
view all 13 authors...
Abstract In this study, we develop a non-equiatomic Co2CrNi1.5Al0.25Ti0.25 quinary medium-entropy alloy (MEA). The heterogeneous grain structure (HGS) (comprising residual deformed grains, micro-sized recrystallized grains and nano-sized recrystallized grains) and heterogeneous precipitation (HP) of the L12 phase corresponding to different kinds of grain structures are simultaneously introduced into the alloy by the well-designed thermomechanical processing. The alloy exhibits an ultra-high yiel...
#1Chang Liu (MPG: Max Planck Society)H-Index: 6
#2Qing Wang (SHU: Shanghai University)H-Index: 13
Last. Jian Lu
view all 8 authors...
Abstract null null Dual-phase metallic glasses (DP-MGs), a special member of the MGs family, often reveal unusual strength and ductility, yet, their corrosion behaviors are not understood. Here, we developed a nanostructured Mg57Zn36Ca7 (at.%) DP-MG and uncovered its corrosion mechanism in simulated body fluid (SBF) at the near-atomic scale utilizing transmission electron microscope (TEM) and atom probe tomography (APT). The 10-nm-wide Ca-rich amorphous phases allow oxygen propagation into the D...
#1Si Lan (Nanjing University of Science and Technology)H-Index: 15
#2Li Zhu (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 1
Last. Xun-Li Wang (CityU: City University of Hong Kong)H-Index: 42
view all 18 authors...
Amorphous materials have no long-range order, but there are ordered structures at short range (2-5 A), medium range (5-20 A) and even longer length scales1-5. While regular6,7 and semiregular polyhedra8-10 are often found as short-range ordering in amorphous materials, the nature of medium-range order has remained elusive11-14. Consequently, it is difficult to determine whether there exists any structural link at medium range or longer length scales between the amorphous material and its crystal...
#2Xiaodi Liu (SZU: Shenzhen University)H-Index: 2
Last. H. Y. Bai (CAS: Chinese Academy of Sciences)H-Index: 12
view all 9 authors...
The enhanced surface mobility in metallic glasses (MGs) has been a constant source of fascination due to its unique mechanical properties. We show experimentally that the mobile surface layer of MGs functions as a lubricating layer in friction experiments, which is evidenced by a reduction of a friction coefficient of 50% or less and suppression of dissipative stick-slip behavior with decreasing scratch depth down to nanoscale in the various MGs. The lubrication mechanism could be attributed to ...
#1Ze Wang (Jiangsu University)H-Index: 3
#2Cheng Wang (CityU: City University of Hong Kong)H-Index: 2
Last. Chun-Hway Hsueh (NTU: National Taiwan University)H-Index: 15
view all 6 authors...
Abstract Designing a metal film with good toughness, high fatigue resistance and electrical resistivity is a daunting challenge for flexible electronic devices. Nanotwin strengthening is a possible way to solve this problem. Nanocrystalline CoCrFeMnNi high entropy alloy films (HEAFs) with high-density nanotwins were processed by magnetron sputtering in the present study. The films exhibited good toughness, high fatigue resistance and the electrical resistivity. The outstanding toughness could be...
#1Tao Zheng (NPU: Northwestern Polytechnical University)H-Index: 4
#2Xiaobing Hu (NPU: Northwestern Polytechnical University)H-Index: 2
Last. C.T. Liu (CityU: City University of Hong Kong)H-Index: 106
view all 12 authors...
Abstract The multi-principal-component concept of high-entropy alloys (HEAs) generates numerous new alloys, among them, nanoscale precipitated HEAs have achieved superior mechanical properties and shown the potentials for structural applications. However, it is still a great challenge to find the optimal alloy within the numerous candidates. Up to now, the reported nanoprecipitated HEAs are mainly designed by a trial-and-error approach with the aid of phase diagram calculations, limiting the dev...
1 CitationsSource
#1Zhufeng He (NU: Northeastern University)H-Index: 2
#2Jia Nan (MOE: Chinese Ministry of Education)H-Index: 2
Last. C.T. Liu (CityU: City University of Hong Kong)H-Index: 106
view all 11 authors...
Abstract: High-entropy alloys (HEAs) have been extensively studied in recent years. However, yield strength of HEAs in which austenite is the dominating phase is usually low, far from satisfying the engineering demands. Improving performance-cost ratio of such alloys will help for their practical structural applications. Here we report a novel strategy to produce ultrastrong, tough, and low-cost HEAs, in which heavy nitrogen-doping (2.6 at.%) was applied to an inexpensive metastable FeMnCoCr HEA...
1 CitationsSource
#1Ze Wang (Jiangsu University)H-Index: 3
#2Cheng Wang (CityU: City University of Hong Kong)H-Index: 8
Last. Chun-Hway Hsueh (NTU: National Taiwan University)H-Index: 15
view all 6 authors...
Abstract Films in the microelectromechanical systems are frequently subjected to the fatigue damage under cyclic loading, and the fatigue properties of the films greatly influence the reliability and life of MEMS. However, because of the small dimension of films, characterization of their fatigue properties is a daunting challenge. Nanoindentation dynamic mechanical analysis (DMA) provides a possible solution. However, the setting of loading cycles is crucial to the fatigue test. Using CoCrFeMnN...
#1H.J. Kong (CityU: City University of Hong Kong)H-Index: 6
#1Haojie Kong (CityU: City University of Hong Kong)
Last. C.T. LiuH-Index: 106
view all 4 authors...
Low-carbon advanced nanostructured steels have been developed for various structural engineering applications, including bridges, automobiles, and other strength-critical applications such as the reactor pressure vessels in nuclear power stations. The mechanical performances and applications of these steels are strongly dependent on their microstructural features. By controlling the size, number density, distribution, and types of precipitates, it is possible to produce nanostructured steels wit...
#1Chengliang Zhao (CAS: Chinese Academy of Sciences)H-Index: 10
#2Anding Wang (CAS: Chinese Academy of Sciences)H-Index: 19
Last. C.T. Liu (CityU: City University of Hong Kong)H-Index: 106
view all 5 authors...
在金属玻璃中可控地引入不均匀性通常能大幅改善其性能, 甚至能突破传统合金设计方法的限制. 本文中, 我们发现在临界非晶形成能力条件下能获得高密度团簇, 且其强交换耦合作用可用于调控磁性能. 基于这些新理念, 我们开发了Fe71(Co, Ni)15B9.5Si2P2C0.5新合金. 由于钴/镍元素添加、团簇析出强化和少量多种类金属元素组合添加等四重强化机制, 合金的饱和磁感应强度达到1.86 T. 同时, 磁场热处理工艺的采用, 可以有效调控结构不均匀和磁畴取向的各向异性, 从而明显改善软磁性能. 此外, 由于临界条件制备平衡了非晶形成能力, 纳米团簇提高了非晶态的稳定性, 我们首次获得了兼具高磁感应强度、 优异软磁性能和非晶形成能力等优异综合性能的软磁非晶合金.