球磨时间对热压烧结制备TiC-CoCrFeNi复合材料微观组织及力学性能的影响
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摘要
采用机械合金化-热压烧结法,制备TiC-CoCrFeNi复合材料,研究球磨时间对材料微观组织及力学性能的影响。结果表明:Co,Cr,Fe和Ni粉体在球磨10h后形成fcc结构的单相固溶体。经1200℃/1h热压烧结后,烧结体中生成TiC和Cr_7C_3结构的碳化物,并弥散分布于CoCrFeNi固溶体中。球磨时间显著改变了烧结体中碳化物的数量和尺寸,进而影响材料的力学性能。在球磨10h时,烧结体中纳米级TiC相急剧增多,此时复合材料的硬度(671HV)和屈服强度(1440MPa)达到最大值。
TiC-CoCrFeNi composite was fabricated by mechanical alloying and consequently vacuum hot pressing sintering, and the effects of milling time on the microstructure and mechanical properties of the composite was investigated. The results show that a single-phase solid solution with fcc structure is obtained after milled for 10 h of Co, Cr, Fe and Ni powders. TiC and Cr_7C_3 structured carbides are formed and dispersed in the CoCrFeNi solid solution after hot pressing sintered at 1200℃ for 1 h. Milling time has a significant effect on the size and amount of TiC and Cr_7C_3 structured carbides, which can affect the mechanical properties of the composite. When the milling time reaches 10 h, the hardness and yield strength of the composite reach the maximum values of 671 HV and 1440 MPa, respectively, which is probably attributed to the dramatically increasing of nano-sized TiC in sintered bodies.
TiC-CoCrFeNi composite was fabricated by mechanical alloying and consequently vacuum hot pressing sintering, and the effects of milling time on the microstructure and mechanical properties of the composite was investigated. The results show that a single-phase solid solution with fcc structure is obtained after milled for 10 h of Co, Cr, Fe and Ni powders. TiC and Cr_7C_3 structured carbides are formed and dispersed in the CoCrFeNi solid solution after hot pressing sintered at 1200℃ for 1 h. Milling time has a significant effect on the size and amount of TiC and Cr_7C_3 structured carbides, which can affect the mechanical properties of the composite. When the milling time reaches 10 h, the hardness and yield strength of the composite reach the maximum values of 671 HV and 1440 MPa, respectively, which is probably attributed to the dramatically increasing of nano-sized TiC in sintered bodies.
引文
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[10] SRIHARITHA R,MURTY B S,KOTTADA R S.Alloying,thermal stability and strengthening in spark plasma sintered AlxCoCrCuFeNi high entropy alloys[J].Journal of Alloys & Compounds,2014,583(2):419-426.
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[12] FU Z,CHEN W,WEN H,et al.Microstructure and strengthening mechanisms in an FCC structured single-phase nanocrystalline Co25Ni25Fe25Al7.5Cu17.5 high-entropy alloy[J].Acta Materialia,2016,107:59-71.
[13] YANG T,XIA S,LIU S,et al.Effects of Al addition on microstructure and mechanical properties of AlxCoCrFeNi High-entropy alloy[J].Materials Science & Engineering:A,2015,648:15-22.
[14] VAIDYA M,TRUBEL S,MURTY B S,et al.Bulk tracer diffusion in CoCrFeNi and CoCrFeMnNi high entropy alloys[J].Acta Materialia,2018,146:211-224.
[15] LI J,JIA W,WANG J,et al.Enhanced mechanical properties of a CoCrFeNi high entropy alloy by supercooling method[J].Materials & Design,2016,95:183-187.
[16] HUO W,ZHOU H,FANG F,et al.Strain-rate effect upon the tensile behavior of CoCrFeNi high-entropy alloys[J].Materials Science & Engineering:A,2017,689:366-369.
[17] SATHIARAJ G D,AHMED M Z,BHATTACHARJEE P P.Microstructure and texture of heavily cold-rolled and annealed fcc equiatomic medium to high entropy alloys[J].Journal of Alloys & Compounds,2016,664:109-119.
[18] ABHAYA S,RAJARAMAN R,KALAVATHI S,et al.Effect of dose and post irradiation annealing in Ni implanted high entropy alloy FeCrCoNi,using slow positron beam[J].Journal of Alloys & Compounds,2016,669:117-122.
[19] SALISHCHEV G A,TIKHONOVSKY M A,SHAYSULTA-NOV D G,et al.Effect of Mn and V on structure and mechanical properties of high-entropy alloys based on CoCrFeNi system[J].Journal of Alloys & Compounds,2014,591(5):11-21.
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