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

doi:10.11868/j.issn.1001-4381.2018.000082

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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Cr₇C₃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。

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	王桂芳
	刘忠侠
	张国鹏

关键词 ：机械合金化, 球磨, 高熵合金, 复合材料

Abstract：

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 10h of Co, Cr, Fe and Ni powders. TiC and Cr₇C₃ structured carbides are formed and dispersed in the CoCrFeNi solid solution after hot pressing sintered at 1200℃ for 1h. Milling time has a significant effect on the size and amount of TiC and Cr₇C₃ structured carbides, which can affect the mechanical properties of the composite. When the milling time reaches 10h, the hardness and yield strength of the composite reach the maximum values of 671HV and 1440MPa, respectively, which is probably attributed to the dramatically increasing of nano-sized TiC in sintered bodies.

Key words： mechanical alloying ball-milling high entropy alloy composite

收稿日期: 2018-01-19 出版日期: 2019-06-17

中图分类号:

TG146

基金资助:河南省高等学校重点科研项目(16A140037)

通讯作者: 张国鹏 E-mail: gpzhang@zzu.edu.cn

作者简介: 张国鹏(1987-), 男, 博士, 主要从事金属陶筑复合材料方面的研究工作, 联系地址:河南省郑州市二七区大学北路75号郑州大学南校区材料物理教育部重点实验室, E-mail:gpzhang@zzu.edu.cn

引用本文:

王桂芳, 刘忠侠, 张国鹏. 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[J]. 材料工程, 2019, 47(6): 94-100.
Gui-fang WANG, Zhong-xia LIU, Guo-peng ZHANG. Effect of milling time on microstructure and mechanical properties of TiC-CoCrFeNi composites prepared by hot pressing sintering. Journal of Materials Engineering, 2019, 47(6): 94-100.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000082 或 http://jme.biam.ac.cn/CN/Y2019/V47/I6/94

Table 1 TiC-CoCrFeNi中各元素的熔点、密度、原子尺寸和晶体结构

Fig.1 不同球磨时间下TiC-CoCrFeNi复合材料粉体XRD图谱

Fig.2 不同球磨时间下CoCrFeNi粉体的形貌图 (a)0h；(b)2h；(c)6h；(d)10h；(e)22h；(f)46h

Fig.3 不同球磨时间下TiC-CoCrFeNi复合材料烧结体的XRD图谱

Fig.4 球磨时间对TiC-CoCrFeNi经1200℃/1h烧结后微观组织的影响 (a)2h；(b)6h；(c)10h；(d)22h；(e)46h

Table 2 TiC-CoCrFeNi复合材料烧结体中不同相的EDS结果

Fig.5 TiC-CoCrFeNi复合材料球磨10h烧结体的TEM明场照片和相应的电子衍射照片 (a)TEM照片；(b)沿[${\rm{\bar 1}}$11]_TiC方向；(c)沿[010]_Cr₇C₃方向；(d)沿[011]方向_CoCrFeNi

Fig.6 球磨时间对TiC-CoCrFeNi复合材料硬度的影响

Fig.7 不同球磨时间下TiC-CoCrFeNi复合材料试样的压缩应力-应变曲线

Table 3 TiC-CoCrFeNi复合材料的压缩力学性能

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