Abstract null null A strong-interference film that absorbs visible light by using oxygen-deficient ZrO2–x was produced by heat treatment of Zr metal foil under a low partial pressure of oxygen. The oxygen-defective tetragonal ZrO2–x film contained nanocrystallites several nanometers in size and its thickness (t) increased from 30 to 140 nm on increasing the holding time during heat treatment. The color of the sample changed depending on the thickness of the oxygen-deficient ZrO2–x film from gold...
Last. Weidong Huang(NPU: Northwestern Polytechnical University)H-Index: 33
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Abstract null null For most safety-critical applications, the achievement of both high strength and high toughness is one of the key requirements for structural materials. However, strength and toughness are generally mutually exclusive. Here, we report a selective-laser-melted Al–Mg–Sc–Zr alloy with a good combination of strength and toughness, which is comparable to those of 7075-T651 high-strength wrought Al alloy. Despite the brittle crack associated with order-induced planar slip due to sec...
Last. Shengfeng Guo(SWU: Southwest University)H-Index: 23
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Abstract null null Among bulk metallic glass (BMG) alloys, molybdenum(Mo)-based BMGs are lacking due to the weak glass forming ability (GFA) of existing Mo-based alloys. In this work, we developed a novel family of low-cost refractory Mo-Co-B BMGs with enhanced GFA and high thermal stability. These Mo-based BMGs exhibit ultra-high glass transition temperatures ranging from 1020 to 1048 K, paired with exceptional nano-hardness and Young's modulus up to 17.1 GPa and 260 GPa, respectively. The exce...
Abstract null null The diffusion mechanism of interstitial solute elements in α-Ti was investigated using first-principles calculations. Solute elements, B, C, N, O and F, were confirmed to be null the null most stable at octahedral sites with their calculated formation energies. The migration energies of C, N and O are high, approximately 2 eV, while those of B and F were approximately 1 eV. A high correlation was observed between the migration energies and difference in the charge densities of...
#1Tian Li(PolyU: Hong Kong Polytechnic University)
#2Ying Shen(PolyU: Hong Kong Polytechnic University)
Last. Guangping Zheng(PolyU: Hong Kong Polytechnic University)H-Index: 32
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Abstract null null Metallic nano-glasses (NGs) are promising in solving the issues of metallic glasses (MGs) such as the intrinsic size limitation and low tensile ductility, while the understanding on the forming ability of glassy structures in NGs is still lacking. Herein, an exponent β is proposed to characterize the glass forming ability (GFA) of NGs, as well as MGs, which is determined by dynamic scaling for mechanical losses (Q − 1) with the frequency ω of external perturbation in their sup...
Last. Runhua Fan(Shanghai Maritime University)H-Index: 45
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Abstract null null Here, Ag/CaCu3Ti4O12 (Ag/CCTO) percolative nanocomposites were fabricated by an in-situ synthesis, where the percolation-related transitions of dielectric and magnetic properties were investigated at radio-frequency band. Epsilon-negative property (e′
Last. Zhu Lilong(CSU: Central South University)H-Index: 1
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Abstract null null It is often assumed that atoms are hard spheres in the estimation of local lattice distortion (LLD) in high-entropy alloys (HEAs). However, our study demonstrates that the hard sphere model misses the key effect, charge transfer among atoms with different electronegativities, in the understanding of the severely distorted local structure in the body-centered cubic (BCC) HfNbTiZr HEA. Through the characterization and simulations of the local structure of the HfNbTiZr HEA, we fo...
Abstract null null Phase control, especially for amorphous phase, is challenging with pulsed laser ablation in liquid (LAL), where ablated materials experience crystallization even at extreme cooling rate during particle solidification processes. Here, metallic glass nanoparticles (MG-NPs) were prepared by picosecond-laser ablation of a Fe78Si9B13 metallic glass (MG) in several organic solvents (i.e. ethanol, acetone, acetonitrile). The employment of ternary MG precursor effectively avoids eleme...
Abstract null null Hafnium diboride (HfB2) is a highly refractory (melting above 3000°C) ceramic with many potential applications at high temperatures. To enable its use at temperature for extended periods its high-temperature plasticity must be known. This paper examines the mechanical response at temperatures between 900°C and 2000°C in air and in a reducing atmosphere, interpreting the data in the frame of classical models for the plasticity of compact-packed metals at low temperatures. In pa...
Abstract null null The effect of marked change in grain size from coarse-grained to nanocrystalline can affect the hydrogen absorption and plastic deformation behavior in two face-centered cubic high-entropy alloys (HEAs), viz. equiatomic CoCrFeNi and CoCrFeMnNi. Thermal desorption analysis of the hydrogen-charged samples proved that grain boundaries act as hydrogen traps and thus largely increase the hydrogen contents in the nanocrystalline samples. A direct comparison in the hydrogen absorptio...