Hard tissue repair materials that balance high strength with low modulus are highly promising,representing a transformative focus in applied biomaterials research.In this study,Ti-Nb alloys with high performance are p...Hard tissue repair materials that balance high strength with low modulus are highly promising,representing a transformative focus in applied biomaterials research.In this study,Ti-Nb alloys with high performance are prepared by a low-cost process for orthopedic applications.Phase composition,modulus,compressive strength and recovery properties are effectively manipulated by tailoring trace amounts of interstitial oxygen.With increasing oxygen concentration in sintered Ti-Nb alloys,theβ(body centered cubic)phase was stabilized due to the lattice distortion.The elastic modulus declined from 91 to 24 GPa.The compressive strength slightly decreased from 1595 to 1404 MPa and yield strength increased from 760 to 904 MPa.Additionally,the recovery properties were enhanced by the interstitial oxygen as a shape memory alloy.The utilization of trace oxygen serves to modulate the thermoelastic martensitic transformation in Ti-Nb alloys,thereby obtaining appropriate mechanical properties.A notable reduction in modulus is achieved while maintaining high strength,which facilitates the development of orthopedic implants capable of withstanding more complex forces.展开更多
In the present study,a body-centered-cubic(BCC)structured Nb/TiNb multilayer nanocomposite with high yield strength,which comprises a soft TiNb matrix and reinforced Nb nanowires,was designed and fabricated with the a...In the present study,a body-centered-cubic(BCC)structured Nb/TiNb multilayer nanocomposite with high yield strength,which comprises a soft TiNb matrix and reinforced Nb nanowires,was designed and fabricated with the aim of elucidating the strengthening mechanism of Nb/TiNb multilayer nanocomposite by scanning electron microscope,transmission electron microscopy and in situ synchrotron X-ray diffraction.It is observed that the Nb/TiNb nanocomposite possesses a high yield strength of~640 MPa,significantly exceeding that of the conventional single-phaseβ-type Ti alloys.Further experimental results indicate that as plastic deformation commenced in the TiNb matrix of Nb/TiNb nanocomposite,load transfer from the soft TiNb matrix into the reinforced Nb nanowires occurred,allowing for a high load-bearing stress contribution and a significant strength enhancement of Nb/TiNb nanocomposite.Meanwhile,the embedded Nb nanowires can effectively impede the propagation of dislocation in TiNb matrix,further strengthening the present nanocomposite.These findings elucidate the strengthening mechanism of Nb/TiNb nanocomposite through the above two combinations,providing a basis for the design and development of the high-strength composites with a single-phase BCC structure for biomedical applications.展开更多
基金Project(52501069)supported by the National Natural Science Foundation of ChinaProject(GZC20233172)supported by the Postdoctoral Fellowship Program of China Postdoctoral Science Foundation(CPSF)Project(21B0121)supported by Hunan Provincial Education Department,China。
文摘Hard tissue repair materials that balance high strength with low modulus are highly promising,representing a transformative focus in applied biomaterials research.In this study,Ti-Nb alloys with high performance are prepared by a low-cost process for orthopedic applications.Phase composition,modulus,compressive strength and recovery properties are effectively manipulated by tailoring trace amounts of interstitial oxygen.With increasing oxygen concentration in sintered Ti-Nb alloys,theβ(body centered cubic)phase was stabilized due to the lattice distortion.The elastic modulus declined from 91 to 24 GPa.The compressive strength slightly decreased from 1595 to 1404 MPa and yield strength increased from 760 to 904 MPa.Additionally,the recovery properties were enhanced by the interstitial oxygen as a shape memory alloy.The utilization of trace oxygen serves to modulate the thermoelastic martensitic transformation in Ti-Nb alloys,thereby obtaining appropriate mechanical properties.A notable reduction in modulus is achieved while maintaining high strength,which facilitates the development of orthopedic implants capable of withstanding more complex forces.
基金supported by the National Natural Science Foundation of China(Nos.51771082,51971009 and 52175410)Zhenjiang Science and Technology Program(No.GY2020001)+2 种基金the Six Talent Peaks Project in Jiangsu Province(No.2019-XCL-113)the Project of Faculty of Agricultural Equipment of Jiangsu University(No.NZXB20200101)Advanced Photon Source,a US Department of Energy(DOE)Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No.DE-AC02-06CH11357.
文摘In the present study,a body-centered-cubic(BCC)structured Nb/TiNb multilayer nanocomposite with high yield strength,which comprises a soft TiNb matrix and reinforced Nb nanowires,was designed and fabricated with the aim of elucidating the strengthening mechanism of Nb/TiNb multilayer nanocomposite by scanning electron microscope,transmission electron microscopy and in situ synchrotron X-ray diffraction.It is observed that the Nb/TiNb nanocomposite possesses a high yield strength of~640 MPa,significantly exceeding that of the conventional single-phaseβ-type Ti alloys.Further experimental results indicate that as plastic deformation commenced in the TiNb matrix of Nb/TiNb nanocomposite,load transfer from the soft TiNb matrix into the reinforced Nb nanowires occurred,allowing for a high load-bearing stress contribution and a significant strength enhancement of Nb/TiNb nanocomposite.Meanwhile,the embedded Nb nanowires can effectively impede the propagation of dislocation in TiNb matrix,further strengthening the present nanocomposite.These findings elucidate the strengthening mechanism of Nb/TiNb nanocomposite through the above two combinations,providing a basis for the design and development of the high-strength composites with a single-phase BCC structure for biomedical applications.
文摘以廉价的钛酸丁酯为钛源,利用溶剂热法大规模合成TiNb_2O_7微球。利用XRD、FESE和TEM对样品进行物相和形貌分析,利用恒流充放电测试样品的电化学性能。TiNb_2O_7微球是由大量尺寸约30~50 nm的纳米粒子构成,微球的平均尺寸约1~2μm,且内部存在大量孔隙。用作锂离子电池负极材料,TiNb_2O_7微球表现出优异的电化学性能,在10 C倍率下,经过100次循环后的可逆比容量仍保持在172 m Ah/g,容量保持率94%。
基金Project(52275363)supported by the National Natural Science Foundation of ChinaProject(202203021212242)supported by the Fundamental Research Program of Shanxi Province,China。
