INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2026
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IF 4.7
Xin Li,Shuai Ma,Ye Gao,Zixuan Tang,Dezhi Wang,Zhuangzhi Wu
To address the issues of insufficient strength and brittleness in traditional W-La 2 O 3 alloys for diamond wire busbars, this work highlights a composite strengthening strategy by inducing La 2 O 3 and LaB 6 at the same time. A systematic comparison was conducted on the composition and microstructure evolution as well as the corresponding compressive properties. The results show that the additional LaB 6 triggers the grain refinement of W with the grain size reduced from 29.96 μm to 22.35 μm via the in-situ formation of fine La 2 O 3 particles. Moreover, LaB 6 also promotes the generation of γ-fiber texture associated with dynamic recrystallization during thermal processing. The as-obtained alloy (W-La 2 O 3 -LaB 6 ) exhibits a compressive strength of 2562.2 MPa in the as-rotary forged state, 408.5 MPa higher than that of the traditional alloy(W-La 2 O 3 ). Concurrently, the corresponding fracture mode transforms from intergranular brittle fracture to transgranular ductile fracture. By virtue of the synergistic effect of multiple strengthening and regulating mechanisms including second-phase strengthening, grain refinement strengthening and texture regulation, LaB 6 efficiently improves the compressive properties and processability of W-La 2 O 3 alloys. This work provides a technical support for the development of high-performance photovoltaic tungsten wire busbars with a low wire breakage rate.
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高影响因子
Journal of Materials Research and Technology-JMR&T
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2026
·
IF 7.3
Hui Chen,Taomei Zhang,Zhijie Ke,Shichao Liu,Min Liu,Dan Li,Chao Chen,Kechao Zhou
This study comparatively investigates the effects of lanthanum hexaboride (LaB 6 ) addition on the microstructure and mechanical properties of Ti-6Al-4V components fabricated by spark plasma sintering (SPS) and selective laser melting (SLM). Gas-atomized spherical Ti-6Al-4V powders were mixed with irregular LaB 6 powders (1.0 wt%) and consolidated using SPS and SLM, respectively. In both processes, LaB 6 partially decomposed into La 2 O 3 and titanium borides, including TiB and TiB 2 . The SPS-processed Ti-6Al-4V, with or without LaB 6 , exhibits a lamellar α+β structure. In contrast, the SLM-fabricated Ti-6Al-4V shows a fully acicular α′ martensitic structure, while the addition of LaB 6 transforms it into a mixed microstructure consisting of α′ martensite and α plates. Owing to the refined structure resulting from the high cooling rate inherent to the SLM process, the SLM-processed Ti-6Al-4V exhibits a higher ultimate compressive strength (1920 MPa) than its SPS counterpart (1540 MPa). The in-situ formation of La 2 O 3 and titanium borides effectively increases the yield strength of both SPS- and SLM-processed Ti-6Al-4V. However, the addition of LaB 6 also leads to a deterioration in ultimate compressive strength, attributed to the reduced plasticity caused by weak interfaces between undissolved LaB 6 particles and the Ti-6Al-4V matrix.
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高影响因子
Metals
·
2023
·Vol. 13
·期 2
·264
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IF 2.9
Dongdong He,Hui Wang,Weidong Huang,Xinxi Chen,Guofu Lian,Yu Wang
In this study, TiB + La2O3/Ti-6Al-4V composites were successfully prepared by in situ reaction using selective laser melting technology. The effect of LaB6content on the fabrication quality, microstructure evolution and mechanical properties of the composite samples was investigated. The results show that the relative density of the sample gradually decreased from 98.56% to 96.57% as LaB6content increased from 0 wt% to 3 wt%. With increasing LaB6content, TiB precipitates gradually aggregated and grew from a discrete needle-like structure to a dendritic structure, before eventually developing a cell-like structure. The dislocations piled up around the TiB and La2O3reinforcements, which impeded the motion of the dislocations and led to the enhancement of the tensile strength of the samples. Different from the addition of a single reinforcement due to the combined strengthening effect of the micrometer-scale and nanoscale reinforcements, the strength of the samples was increased significantly. The Ti-6Al-4V sample with 3 wt% LaB6addition showed the most significant strengthening effect. Compared to the pure Ti-6Al-4V sample, the 3 wt% LaB6addition sample gained a 35.71% increase in hardness and a 14.5% increase in tensile strength. Additionally, wear volume was reduced by 47.5%. The results revealed that the addition of LaB6was a potential way to improve the mechanical performance of the titanium alloys in the additive manufacturing process.
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高影响因子
Materials Today Communications
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2023
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IF 3.8
Hui Wang,Dongdong He,Weidong Huang,Xinxi Chen,Yu Wang,Lihong Huang
In this study, LaB 6 -reinforced Ti6Al4V was successfully fabricated by the selective laser melting (SLM) process. TiB and La 2 O 3 with particle-like shapes formed uniformly after the in-situ reaction of LaB 6 and Ti6Al4V. The sizes of the TiB and La 2 O 3 particles were around 1 µm and 200 nm, respectively. Due to a combined strengthening effect of the micrometer-scale and nanoscale reinforcements, the mechanical properties of the LaB 6 /Ti6Al4V samples were enhanced significantly. However, the effect was highly related to the SLM parameters. As the laser power increased, the TiB changed from particle to needle-like shape and La 2 O 3 tended to aggregate and grow into a larger size. Besides, the martensite α-Ti also became coarser, which was disadvantageous to the mechanical performance. The desired inner structure can be obtained by adjusting the processing parameters of the SLM. The best mechanical performance of the SLM LaB 6 /Ti6Al4V samples was achieved at the laser power of 260 W and the scanning speed of 500 mm/s. The maximum tensile strength and Vickers hardness were 1337.1 MPa and 477.62 HV, respectively, which outperformed the other counterparts significantly. Thus, the results suggest that the in-situ reaction of LaB 6 and Ti6Al4V can improve the mechanical properties of the Ti6Al4V alloys effectively.
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高影响因子
MATERIALS & DESIGN
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2018
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IF 4.525
Changcong Wang,Kezhi Li,Qinchuan He,Caixia Huo,Xiaohong Shi
A combined heterogeneous coating composed of LaB 6 -MoSi 2 -TiB 2 (LMT) outer layer and SiC inner layer was fabricated on carbon/carbon (C/C) composites using a two-step method. Among them, the SiC transition layer was in-situ synthesized by pack cementation (PC) in the first step, where-after supersonic atmospheric plasma spraying (SAPS) was devoted to deposit the LMT outer layer. The combined LMT/SiC coating revealed a representative microstructure with limited porosity and adhered well with the C/C substrate. Isothermal oxidation test demonstrated that the combined LMT/SiC coating displayed a better oxidation resistance than the MoSi 2 /SiC coating without the addition of rare-earth La and alloying Ti elements at 1773 K. Oxyacetylene torch experiment showed that the combined LMT/SiC coating could efficiently protect the C/C composites withstand short-term ablation for 60 s. The good oxidation and ablation resistant properties of the combined LMT/SiC coating were ascribed to the integrity of LMT/SiC coating and superior protection of a glassy La-Si-O-B-Ti compound scale formation during oxidation and ablation.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2018
·
IF 13.325
Lu Zhuang,Liu Limeng
TaC ceramics were prepared by hot pressing at 1900 °C for 30 min under 30 MPa mechanical pressure. The effect of adding 1–10 mol% LaB 6 as a sintering aid on densification, the phase composition, microstructure and mechanical properties of the consolidated materials were investigated. TaC and LaB 6 reacted to form the solid solution. The grain average size decreased from 10 μm at 1 mol% LaB 6 addition to 4 μm at 10 mol% LaB 6 addition. The 5 mol% LaB 6 composition had good flexural strength of 312 MPa. Keywords Ultra high-temperature ceramic Tantalum carbide Hot pressing
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
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IF 3.582
Yishan Li,Nianbing Zhong,Qiang Liao,Qian Fu,Yun Huang,Xun Zhu,Qiaoliang Li
A novel photothermal biomaterial , designated GeO 2 -SiO 2 -Chitosan-Medium-LaB 6 (GSCML), was prepared to improve photosynthetic bacteria (PSB) biofilm development and hydrogen production performance. This biomaterial employed spectral beam splitting technology to increase the overall utilization of the incident light spectrum, which LaB 6 nanoparticles (NPs) mainly absorb light at approximately 380–510 and 660–780 nm and convert it into heat energy ; the transmit light is around 590 nm for PSB growth. The temperature increased, and the luminous intensity of the light transmitted through the prepared biomaterial are controlled by adjusting the LaB 6 NPs' content. The average biofilm growth rate and hydrogen production rate of the biofilm on the created biomaterial were 0.05 mg/cm 2 /day and 2.92 mmol/h/m 2 , which were 3.4 and 4.1 times higher than those of the glass slide, respectively. The properties of the GSCML biomaterial provide advantages for applications in immobilized cell technologies and photobioreactors.
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高影响因子
ACS Catalysis
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2015
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IF 9.312
Ruiyan Sun,Tingting Wang,Mingyuan Zheng,Weiqiao Deng,Jifeng Pang,Aiqin Wang,Xiaodong Wang,Tao Zhang
Using cellulosic biomass to synthesize bulk quantities of high-value chemicals is of great interest for developing a sustainable biobased society. Especially, direct catalytic conversion of cellulose to glycols, important building blocks for polymers, remains a grand challenge. Herein, we report the development of a versatile binary nickel–lanthanum(III) catalyst for the conversion of cellulose to both ethylene glycol (EG) and propylene glycol (1,2-PG) in a yield of 63.7%, which is one of the best performances reported for this catalytic reaction. Especially, lanthanum(III) exhibited a high level of activity toward the degradation of cellulose (TON = 339) at a very low concentration (0.2 mmol/L). On the basis of density functional theory calculations and experimental analyses, we addressed a dual route for this catalytic mechanism: a major route involving the selective cracking of sugars into C2 molecules and a minor route involving the hydrogenolysis of sugar alcohols. Lanthanum(III) catalyzes the cleavage of the C2–C3 bond in glucose via sequential epimerization and 2,3-hydride shift reactions to form glycolaldehyde, the precursor of EG.
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