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.
