Home  | About Journal | Editorial Board | Instruction | Subscribe | Editorial office | Message | Indexed-in | 中文
Office Online  
Online Submission
Peer Review
Editor Work
Office Work
Editor-in-Chief
Journal Online
    Current Issue
    Advanced Search
    Archive
    Read Articles
    Download Articles
    Email Alert
    
Quick Search  
  Adv Search
2026 Vol. 31, No. 2
Published: 2026-04-15
Engineering and Technology
Theoretical Research
Review
 
       Review
113 Research progress on fatigue properties and fracture toughness of refractory alloys for reactors
CHEN Pengxu, LIU Xudong, DOU Yankun, HE Xinfu
DOI: 10.19976/j.cnki.43-1448/TF.2026001
Refractory alloys possess outstanding high-temperature mechanical properties and radiation resistance, offering broad application prospects in fourth-generation nuclear energy systems. This paper reviews research progress focusing on the effects of processing techniques, alloy composition, and extreme service conditions of the reactor on the fatigue properties and fracture toughness of refractory alloys. It reveals that current research on refractory alloys for reactors has evolved from traditional materials preparation and property characterization to a systematic exploration of the interactions among processing techniques, alloy composition, and service environments. It identifies existing problems in the current research and outlines key future research directions for refractory alloys in reactor applications.
2026 Vol. 31 (2): 113-124 [Abstract] ( ) HTML (0 KB)  PDF  (643 KB)  ( )
       Theoretical Research
125 First principles study on electronic structures and optical properties of 0D TTF bismuth-based halide perovskites
ZHANG Jian, LI Ping
DOI: 10.19976/j.cnki.43-1448/TF.2025085
Addressing the susceptibility of bismuth-based halide perovskites to hydrolysis in air and the consequent limitations on experimental characterization, this study employs first principles calculations to systematically investigate the electronic structures, optical properties, and weak interaction mechanisms of three kinds of 0D tetrathiafulvalene (TTF) bismuth-based halide perovskites [TMT-TTF]BiCl5, [TMT-TTF]Bi3Cl11, and [TMT-TTF]Bi4Cl16 with distinct valence states (+2, +1, and mixed valence state). The results demonstrate that all three kinds of 0D TTF bismuth-based halide perovskite materials exhibit direct bandgap structures, with both the conduction band minimum and valence band maximum concentrating at the X|Y high-symmetry points. These materials display weak optical anisotropy and distinctive optical responses. The interaction between TTF cations and the bismuth-based halide frameworks is dominated by van der Waals forces, while the interior of the materials is primarily governed by chemical bonding interactions. This study provides crucial theoretical support for developing high-stability and high-efficiency low-dimensional perovskites.
2026 Vol. 31 (2): 125-135 [Abstract] ( ) HTML (0 KB)  PDF  (899 KB)  ( )
       Engineering and Technology
136 Microstructure and mechanical properties of boron carbide ceramics prepared by hot press sintering process
ZHOU Zhihui, YUAN Tiechui, ZHOU Xiangxing
DOI: 10.19976/j.cnki.43-1448/TF.2025084
In this paper, boron carbide ceramics were prepared by hot press sintering method using boron carbide powders of different particle sizes as raw materials. The effects of the raw material powder particle size and sintering process parameters on the microstructure and mechanical properties of boron carbide ceramics were investigated using X-ray diffractometer, scanning electron microscope, microhardness tester, and universal mechanical testing machine. The results show that the porosity and grain size of boron carbide continuously decrease with the reduction of powder particle size, while the grain growth rate accelerates. The increase in sintering temperature, the enhancement of sintering pressure, and the extension of soaking time are conducive to promoting the densification of boron carbide ceramics. The mechanical properties of boron carbide ceramics depend on the porosity and grain size. As the porosity decreases from 13.49% to 0.31%, the microhardness increases from 15.1 GPa to 31.7 GPa, while the fracture toughness decreases from 3.04 MPa·m1/2 to 2.07 MPa·m1/2. As the average grain size increases from 1.47 μm to 150.51 μm, the microhardness decreases from 31.3 GPa to 28.9 GPa, while the fracture toughness decreases from 2.55 MPa·m1/2 to 1.42 MPa·m1/2.
2026 Vol. 31 (2): 136-145 [Abstract] ( ) HTML (0 KB)  PDF  (726 KB)  ( )
146 The influence of tensile rate and temperature on the tensile properties of 4043 aluminum alloy prepared by wire arc additive manufacturing
ZHENG Haoran, GENG Guoliang, QU Fang, XU Jiamiao, YU Shiqi
DOI: 10.19976/j.cnki.43-1448/TF.2025079
In this study, 4043 aluminum alloy was fabricated by wire arc additive manufacturing. The microstructure and properties of as-deposited 4043 aluminum alloy were systematically investigated using optical microscope, X-ray diffractometer, digital microhardness tester, and electronic universal testing machine. The results show that the alloy has a uniform microstructure, with Al-Si eutectic phase and α-Al phase as the main phases. All the fracture surfaces exhibit ductile fracture characteristics, while pore defects can weaken the ductility of the alloy. At room temperature, with the increase of tensile rate, the yield strength and tensile strength of the alloy in both transverse and longitudinal directions increase, while the elongation decreases, indicating that the alloy has tensile rate sensitivity. When the tensile rate is fixed at 1 mm/min, the yield strength and tensile strength of the alloy in both transverse and longitudinal directions decrease with the increase of temperature, accompanied by an increase in elongation.
2026 Vol. 31 (2): 146-154 [Abstract] ( ) HTML (0 KB)  PDF  (749 KB)  ( )
155 Effects of aging treatments on the microstructure and elastic after-effect behavior of QBe2.0 alloy
LIANG Weihan, LIU Ziyi, WANG Xing, XU Yuxuan, CHEN Deshan, YAO Pingping
DOI: 10.19976/j.cnki.43-1448/TF.2025087
Under high-frequency insertion and extraction and vibrational conditions, the presence of elastic after-effect results in unstable contact stress of electrical connectors and consequently degrades transmission performance and transfer efficiency. In this work, QBe2.0 alloy was subjected to single and double stage aging treatments. The microstructure and elastic after-effect behavior of QBe2.0 alloy under different aging conditions were investigated using scanning electron microscope, X-ray diffractometer, transmission electron microscope, and high-frequency testing machine, and the underlying strengthening mechanism was elucidated. The results show that the elastic after-effect performance of QBe2.0 alloy is optimized under double-stage aging at 240  ℃/150  min+290 ℃/180  min, with an elastic after-effect value of 2.83%. Compared with single-stage aging, this optimized process promotes the formation of fine and homogeneous γ′ precipitates. These precipitates effectively pin dislocations, shorten the length of dislocation free segments, increase the energy barrier for dislocation migration, and reduce both the amplitude and characteristic time scale of dislocation rebound, thereby significantly suppressing elastic after-effect. This study provides theoretical foundations and practical process guidance for developing elastic components suitable for high-performance electrical connectors.
2026 Vol. 31 (2): 155-162 [Abstract] ( ) HTML (0 KB)  PDF  (1019 KB)  ( )
163 Preparation and adsorption performance of rapeseed-derived bismuth-based activated carbon powder
LIU Runzhuo, ZHANG Liqiang, MA Xiancheng, CHEN Zhaoke
DOI: 10.19976/j.cnki.43-1448/TF.2025088
To achieve high-value utilization of agricultural waste rapeseed residue and address the challenge of efficient radioactive iodine capture, this study utilized rapeseed residue as a precursor to prepare porous activated carbon carriers via hydrothermal-alkali activation. Subsequently, a solvothermal method was employed to construct composites (Bi/RS) with varying bismuth loadings. The microstructure of composites were analyzed by combining scanning electron microscope, transmission electron microscope, X-ray diffractometer, X-ray photoelectron spectrometer, etc. Adsorption experiments using gaseous iodine, iodine/cyclohexane solution, and aqueous iodine solution were conducted to systematically investigate the adsorption kinetics and mechanism. Results indicate that nanoscale bismuth (Bi0) is uniformly dispersed on the carbon framework surface and within its pores, slightly reducing the specific surface area of materials while maintaining a highly developed micropore structure. The incorporation of bismuth significantly enhances chemical iodine fixation capacity of composites, with Bi/RS-0.4 achieving an iodine retention rate of 83.1% after three adsorption cycles in the gas phase adsorption. In liquid phase adsorption, the low-loading Bi/RS-0.1 exhibit optimal performance, achieving over 99% removal efficiency for iodine/cyclohexane solutions and a saturated adsorption capacity of 2 293 mg/g in aqueous iodine solutions. The synergistic effect of physical adsorption (pore trapping) and chemical adsorption (Bi-I precipitation and functional group complexation) is key to efficient iodine fixation of Bi/RS. Bi/RS not only achieves resource utilization of waste rapeseed residue but also exhibits outstanding adsorption performance and stability in both gas and liquid phases, providing a theoretical and material foundation for radioactive iodine waste management.
2026 Vol. 31 (2): 163-175 [Abstract] ( ) HTML (0 KB)  PDF  (832 KB)  ( )
176 Microstructure and properties of novel graphite flakes/6061Al matrix composites with three-dimensional Al frame
PENG Ziyue, LIU Junfu, NIE Qiangqaing, TANG Wenming
DOI: 10.19976/j.cnki.43-1448/TF.2026005
Aiming at the key issues of graphite flakes (GFs)/Al matrix composites, i.e., significant anisotropy and poor through-plane thermal conductivity and mechanical properties, in this study, a three-dimensional aluminum foam (Alf) was introduced to fabricate the GFs/6061Alf matrix composites via spark plasma sintering. Their microstructure and properties were also investigated, compared with those of the conventional GFs/6061Al matrix composites. The results demonstrate that the GFs/6061Alf matrix and GFs/6061Al matrix composites sintered at 610 ℃ are both dense, and no interfacial reaction product Al4C3 is detected. With the increase of the GFs content, the relative density, through-plane thermal conductivity, coefficient of thermal expansion, bending strength, and bending strain of the composites all decrease, however, the in-plane thermal conductivity of the composites gradually increases. In the GFs/6061Alf matrix composites, the Alf has a 3D continuous structure, which is beneficial to the improvement of plasticity. Meanwhile, the GFs are sealed in each small pocket of the Alf, resulting in lower distribution orientation degree of GFs, and thus enhancement of through-plane thermal conductivity of the composites. The through-plane thermal conductivity and bending strain of the GFs/6061Alf matrix composite with a 45% GFs volume fraction are 38 W/(m·K) and 4.4%, 23% and 100% higher than those of the GFs/6061Al matrix composite, respectively. This strategy has apparent advantages in reducing anisotropy and brittleness of the GFs/Al matrix composites.
2026 Vol. 31 (2): 176-187 [Abstract] ( ) HTML (0 KB)  PDF  (811 KB)  ( )
188 Influence mechanism of grain boundary α phase configuration on the strength and toughness of TC18 near-β titanium alloy
FAN Jingxian, LIU Chaoqiang, ZHAN Xiaodong, YANG Xiuye, GE Jinyang
DOI: 10.19976/j.cnki.43-1448/TF.2026010
Near-β titanium alloys, owing to their outstanding strength and toughness, have become key structural materials in aerospace applications. However, achieving the synergistic coordination of strength, plasticity, and toughness remains a critical challenge. This study focuses on lamellar structured TC18 near-β titanium alloy. By employing two different processes, namely dual annealing and forging combined with dual annealing, alloys with distinct grain boundary α configurations (C-GB and D-GB) were prepared. The aim is to investigate the influence mechanism of grain boundary α configuration on the strength and toughness of the alloy. The results indicate that the content and size of primary α phase within the grains are similar in both C-GB and D-GB alloys. The main difference lies in the distribution of the grain boundary α phase, which is continuous in the C-GB alloy, while it exhibits a discontinuous distribution in the D-GB alloy. The grain boundary α configuration has a minor effect on the tensile strength of the alloy, the tensite strength of D-GB alloy (1 052.8 MPa) is approximately 6.7% higher than that of the C-GB alloy (986.3 MPa). However, it plays a decisive role in plasticity and fracture toughness. The elongation and fracture toughness of the D-GB alloy (12% and 91.5 MPa·m1/2) are significantly higher than those of the C-GB alloy (3% and 76.7 MPa·m1/2). In the C-GB alloy, the continuous grain boundary α phase acts as a preferential pathway for crack initiation and propagation. In contrast, in the D-GB alloy, the discontinuous grain boundary α phase and the randomly oriented α lamellae prevent local dislocation pile-up, leading to more uniform plastic deformation, then effectively inhibiting void nucleation and crack propagation. This study provides insights for designing titanium alloys with both high strength and high damage tolerance.
2026 Vol. 31 (2): 188-198 [Abstract] ( ) HTML (1 KB)  PDF  (1079 KB)  ( )
News
· fdsafdas
· eee
Dynamic
· 1
· 2e
Download
Links
· CNKI
Copyright © Editorial Board of HXYFYX
Supported by:Beijing Magtech