MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Zeyun Cai,Tao Xiang,Weizong Bao,Jiayin Chen,Tian Gao,Guoqiang Xie
Pure titanium is an ideal material for tissue replacements and implant materials for its superior biocompatibility and corrosion resistance , but its limited strength remains a major obstacle to its wide applications. A promising strategy for enhancing the strength is to alloy the pure titanium with oxygen. Herein, we reported an oxygen solid solution strengthening for pure titanium by achieving a titanium-oxygen (Ti–O) alloy using ball milling (BM) and spark plasma sintering (SPS). The effect of oxygen contents, ranging from 0.33 to 2.08 wt%, on the mechanical properties of pure titanium was systematically investigated. Experimental results indicate that the Ti–O alloy with the oxygen content of 1.95 wt% reached an ultrahigh yield strength of 2026 MPa and showed a large ductility of 11.2% in compression. According to the quantified analysis of strengthening mechanisms, solid solute oxygen atoms are responsible for the balance of superior yield strength and ductility of the Ti–O alloys.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Xiao-Chun Deng,Xin Lan,Ya-Long Wang,Guo-Hua Zhang
Mo 2 C doped WC-10Co alloys were prepared via an in - situ synthesis method composed of steps of spray drying, roasting, carbothermal pre-reduction and carbonization-vacuum sintering. The effects of Mo 2 C content on the microstructure and mechanical properties of cemented carbides were studied in detail. The results showed that WC and Mo 2 C formed a complete solid solution by the current method. With the increase of Mo 2 C content from 0 wt% to 0.5 wt%, the effects of solution strengthening and fine grain strengthening were obvious, and the grain size was decreased from 0.72 ± 0.32 μm to 0.62 ± 0.27 μm, while the hardness was improved from 1316 ± 20 HV 30 to 1549 ± 14 HV 30 . However, the (W, Mo)C solid solution would deteriorate the fracture toughness of the alloys. With the further increase of Mo 2 C content to 9 wt%, the lattice distortion in the solid solution became more serious. Meanwhile, the dissolution of more Mo 2 C in the liquid Co further weakened the dissolution-precipitation process of the solid solution, thus inhibiting the growth of grains and increasing the hardness of the alloys. In addition, with the increase of Mo 2 C content, the dominant fracture mode of the alloy changed from transgranular fracture to intergranular fracture .
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiao-Chun Deng,Guo-Hua Zhang
A series of high-entropy carbide ceramics with high-performance were successfully prepared by SPS using self-synthesized fine high-entropy carbides powders as hard phase and metal Co as the binder. The effects of Ti and/or Mo addition on densification, grain size and mechanical properties of (ZrHfTaNb)C–10Co ceramic were investigated. The results showed that the addition of Mo improved the wettability between the ceramic phase and Co phase, and significantly increased the densification degree of the ceramics. In addition, the average grain size decreased and the microstructure became more uniform after adding Ti and/or Mo. Compared with the mechanical properties of (ZrHfTaNb)C–10Co ceramic, those of (ZrHfTaNbTiMo)C–10Co ceramic were greatly enhanced under the action of high-entropy effect and solid solution strengthening. The hardness and fracture toughness of the (ZrHfTaNbTiMo)C–10Co ceramic achieved the satisfactory values of 20.37 GPa and 8.59 MPa m 1/2 , respectively.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Wanhong Yu,Guifang Li,Changwan Sun,Jianquan Zhang,Li Yang,Yichun Zhou
In this paper, we propose an effective method for doping WC into Ta-Hf-C ceramics to significantly enhance their densification and mechanical properties. An increasing WC doping amount from 0 to 20 at.%, enhances the densification of Ta-Hf-C ceramics from 92.4 % to 99.1 %. This is mainly due to the fact that the doping of WC effectively removes the harmful oxygen impurities from the ceramics, thereby increasing their sintering activity. Furthermore, the doping of WC plays an active role in the mechanical properties of the ceramics. The Ta-Hf-C doped with 15 at.% WC has the highest value of 36.41 GPa for nano-hardness due to the solid solution strengthening mechanism, while the highest Vickers hardness (38.75 GPa) and fracture toughness (3.76 MPa m 1/2 ) appear in Ta-Hf-C doped with 20 at.% WC. The main toughness mechanism is W segregation at the grain boundary, enhancing grain boundary strength .
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 24
·11013-11025
·
IF 4.682
Luo Guoqiang,Li Peibo,Hu Jianian,Guo Jingwei,Sun Yi,Shen Qiang
The purpose of this paper was to design an Al–Cu–Ag–C material system to address the deterioration of mechanical properties caused by intermetallic compounds generated during Al–Cu sintering. The in situ pyrolytic C layer was encapsulated on the surface of the raw material particles, which prevented Al–Cu diffusion and reduced the generation of intermetallic compounds. The microstructure of the Al–Cu–Ag–C composites illustrates that several alloy phases of Al 2 Cu, Al 4 Cu 9 , and Ag 2 Al are formed. The addition of Ag significantly improved the mechanical properties of the composite due to the formation of the Ag 2 Al phase and Cu–Ag solution. The tensile strength and compressive strength of Al–52Cu–3Ag–C are increased by 123.9% and 64.9% over Al–52Cu–C, and the strain is also considerably improved. The strength enhancement derived from the Orowan strengthening contributed by Ag 2 Al, and the solid solution strengthening contributed by Ag–Cu solid solution, respectively. The presence of Ag 2 Al also enhances the hardness of the composite.
研究领域:
材料科学
·
力学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2023
·
IF 6.4
He Zhang,Xiao-Chun Deng,Guo-Hua Zhang
In this study, high performance W–Mo–Cu–Ni–Fe alloy samples with additions of Mo (0–6 wt%), Ni and Fe (total content: 2.5 wt% and 5 wt%) were obtained through liquid-phase sintering at lower temperature, with the raw material of ultrafine W–Mo–Cu–Ni–Fe composite powder. Ultrafine W–Mo–Cu–Ni–Fe alloy powder with strong sintering activity and uniform composition was obtained by two-stage reduction means composed of carbothermic pre-reduction and hydrogen deep deoxidation steps. Significantly, the bonding ability of W/Cu phase interface and the wettability of two phases are greatly improved due to the presences of Ni and Fe. Moreover, the addition of appropriate Mo content was advantageous to the formation of W–Mo solid solution . All alloy samples achieved higher densification degrees to guarantee that the sintered blocks possess outstanding overall performances. Especially, by adjusting Ni/Fe ratio, the highest tension strength and elongation of were achieved by W-2wt.%Mo-1.75 wt%Ni-0.75 wt%Fe-27.5 wt%Cu sintered block, which were 567 MPa and 10.37%, respectively. Moreover, owing to the presences of W–Mo and Cu–Ni–Fe solid solutions, this alloy also had the highest microhardness and bending strength of 446 HV and 1473 MPa, respectively. As increasing Mo content from 0 wt% to 6 wt%, the compression strength of sintered blocks was improved, and failure strains of all the sintered blocks are close to 100%, respectively. However, even though the Cu matrix network structure is more evenly distributed as a result of the existences of added Ni and Fe, the electronic movement ability of the sintered blocks was reduced, leading to a significant decrease in conductivity.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Guo-rong Ji,Ming Feng,Huilan Hao,Yunfeng Gao,Baoshun Zhu,Yu-ming Tian
In this study, varying amounts of MnO 2 up to 5 wt.% were added to magnesium aluminate spinel (MA) bodies using a solid-state sintering method at 1200–1600°C. The effect of MnO 2 addition on the phase composition, microstructure, distribution of elements, and ionic valence of MA was investigated via X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy, respectively. The results showed that Mg 2+ ions in MA crystals were replaced by Mn 2+ ions, resulting in the formation of the (Mg 1- x Mn x )Al 2 O 4 solid solution. The distorted crystal structures promoted the sintering reactions, and the mechanical characteristics of MA were greatly improved by the solid solution strengthening process. When the additive amount of MnO 2 was 5 wt.% and the sintered temperature reached at 1600°C, excess manganese ions hardly dissolved into the lattice of MA. And these ions were only distributed at the grain boundaries of MgAl 2 O 4 , forming a “barrier” that hindered the migration and diffusion of particles, thereby suppressing the sintering process and weakening the mechanical strength of MA.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Dezhi Wang,Dongyang He,Kai Li,Zhuangzhi Wu
The strength enhancement is critical for the application exploration of Mo-based materials. In this work, a secondary phase of WC is introduced into the Mo matrix, and the corresponding phase, microstructure and mechanical properties have been studied. It is found that the addition of WC particles can significantly improve the mechanical properties, leading to a high ultimate tensile strength (UTS) of 591.5 MPa and a hardness of 242.7 HV over the sintered Mo–12%WC composite, which are about 21.2% and 49.5% higher than those of pure Mo, respectively. During the sintering, the additive WC particles react with the Mo matrix to in-situ generate W and Mo 2 C, and the former is dissolved into the Mo matrix to exhibit solid solution strengthening. Besides, the latter hinders the migration of grain boundaries (GBs) to limit the grain growth of Mo, resulting in smaller grain size. More importantly, the Mo 2 C ( 1 ‾ 2 ‾ 1 ) can gain coherent interfaces with Mo ( 1 1 ‾ 0) to intensify the phase boundary. This work paves a way for the design of high-performance composites through the in-situ reinforcement of decomposable additives.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Zeyun Cai,Xi Cheng,Jiayin Chen,Tao Xiang,Guoqiang Xie
Oxygen solid solution-strengthened titanium-oxygen (Ti–O) alloys with ultrahigh yield strength and large ductility were designed and synthesized via high-energy ball milling (BM) combined with spark plasma sintering (SPS) in compression. The morphology, dispersion state, and solid solution microstructure of the Ti–O alloys were optimized by regulating the mixing method, sintering temperature, and added oxygen content. Outstanding properties that include a compressive yield strength of 1220 MPa and large ductility of 36.3% were achieved after 1 h high-energy BM and 1000 °C SPS with the addition of about 1.8 at% oxygen. The grain refinement and oxygen solid solution strengthening indicate that the dense morphology, refined grain size, and oxygen solid solute atoms are responsible for the balance between the superior strength and ductility of the titanium alloys.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2023
·Vol. 13
·期 5
·
IF 1.6
Zhang Lan,Yu Shiyao,Ma Huizhong,Zhu Mingcheng,Zhang Jidong
The fabrication of ZrC–Mo composites with (10–25 vol. %) Mo content using a spark plasma sintering at 1750 °C under 35 MPa was investigated in this research. The effects of adding various Mo contents on the composites were also examined. The microstructure and phase analysis were investigated by scanning electron microscopy, x-ray diffractometer, and energy dispersive spectroscopy. Microscopic analysis revealed that the addition of metal Mo resulted in making the ceramic particles of ZrC finer, the sintered products denser, and the sintering conditions softer. Moreover, a continuous solid solution forms in the composite as the Mo content rises, the (Zr, Mo)C and (Zr, Mo) 2 C start to generate, and thus solid solution strengthens the material. The addition of metal Mo reduced the grain size of the ceramic composite and also lead to fine-grain strengthening. With a relative density of 97.53%, a Vickers hardness of 23.88 GPa, and a flexural strength of 317.55 MPa, the composite possessed the best properties when the molybdenum volume fraction reaches 15 vol. %. The synergistic effect of fine grain strengthening and solid solution strengthening improved the mechanical behavior of the composite.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Feng Zhao,Qiang Tao,Cun You,Meiyan Ye,Li Li,Yang Han,Shushan Dong,Xin Wang,Tian Cui,Pinwen Zhu
MoB 2 , with a layered structure, is a potential functional material that is expected to be used as catalysts and conductors. However, the lower hardness limits its application in extreme environment. Solid-solution hardening is a suitable way to enhance hardness and keep structure, but it is complicated in transition metal borides (TMBs) solid solutions . Up to now, uncovering the intrinsic factors of solid-solution hardening is still a challenge. In this work, the structural, electronic and hardness properties of Mo 1-x W x B 2 ( x = 0.01~0.20) is studied to explore the potential factors. It is found that sharp increase in hardness of Mo 1-x W x B 2 at low W doping level (≤5 at%), and highest Vickers hardness of 26.7 ± 1.2 GPa (applied 0.49 N load) was obtained by Mo 0.95 W 0.05 B 2 . The high hardness reason is ascribed to the lattice distortions lead to internal stress at the nanoscale , which created local symmetry reduction by affected local electron distribution of B–B bond and the lattice position of Mo atoms. Moreover, at higher W doping level, TM-B bond is strengthened by increasing electron transfer from the tungsten atoms to the boron atoms , which resulting in the hardness increasing of Mo 1-x W x B 2 . This provides guidance for designing TMBs solid solutions with better mechanical properties.
研究领域:
材料科学
·
固体物理
·
无机非金属材料
·
结构与性能关系
·
过渡金属硼化物
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Mingcheng Zhu,Lan Zhang,Na Li,Desen Cheng,Jidong Zhang,Shiyao Yu,Hui Bai,Huizhong Ma
Ternary ZrB 2 –SiC–MoSi 2 composites with different nominal volume fractions of SiC (10–25 vol%) and MoSi 2 (5–20 vol%) were sintered by reactive spark plasma sintering (RSPS) at 1650 °C and 35 MPa from the starting powders of ZrB 2 , Si, Mo and activated charcoal. The densification behaviour, microstructures and mechanical properties were comprehensively investigated. SiC clusters and MoSi 2 were formed by in-situ reactions and the improved sintering efficiency was attributed to the mass transfer by liquid Si. The formation of a core–shell (Zr, Mo)B 2 solid solution was confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). With the addition of the nominal MoSi 2 content up to 15 vol%, the molar ratio of MoB 2 in the solid solution shell increased owing to the increase of Mo; the densification and mechanical properties decreased owing to the softness of MoSi 2 , the cracks, and the large size of SiC clusters. The relative density, Vickers hardness , and fracture toughness of ZrB 2 –SiC–MoSi 2 composites were significantly better than those of bulk ZrB 2 owing to the combined effect of phase enhancement and solid solution strengthening.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）