Zhu Yunlong, Zhao Qinglong, Liu Xiao, Geng Run, Wang Bao, Jiang Qichuan
State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China.
Key Laboratory of Automobile Materials, Ministry of Education and School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun 130025, China.
Nanomaterials (Basel). 2020 Nov 24;10(12):2330. doi: 10.3390/nano10122330.
In this work, a high strength-ductility Ti64 cast alloy, containing trace TiC-TiB nanoparticles, was fabricated by adding dual-phased nano-TiC-TiB/Al master alloys to the molten Ti64 alloys. The trace addition of the TiC-TiB nanoparticles (0.1 wt%) simultaneously reduced the size of the β grains, the α laths, and the α colony size of the lamellar structure during casting and suppressed the coarsening of the α laths during heat treatment. The yield strength and the uniform elongation of TiC-TiB/Ti64 were increased by ~130 MPa and 2%, respectively. The simultaneously improved strength and ductility of the TiC-TiB/Ti64 were attributed to the decrease in the α colony size of the lamellar structure, the significant refinement of the grains and α laths, and the pinning effect of nanoparticles.
在本研究中，通过向熔融的Ti64合金中添加双相纳米TiC-TiB/Al中间合金，制备了一种含有微量TiC-TiB纳米颗粒的高强度-高延展性Ti64铸造合金。微量添加TiC-TiB纳米颗粒（0.1 wt%）在铸造过程中同时减小了β晶粒、α板条和层状组织α集束尺寸，并抑制了热处理过程中α板条的粗化。TiC-TiB/Ti64的屈服强度和均匀伸长率分别提高了约130 MPa和2%。TiC-TiB/Ti64强度和延展性的同时提高归因于层状组织α集束尺寸的减小、晶粒和α板条的显著细化以及纳米颗粒的钉扎效应。
