High-strength molybdenum matrix composites with in-situ Mo2C by graphene addition
High-strength molybdenum matrix composites with in-situ Mo2C by graphene addition
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添加石墨烯原位Mo2C高强度钼基复合材料
DOI：
10.1016/j.jallcom.2019.153401
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发表时间：
2020-04
影响因子：
6.2
通讯作者：
Zhang Guojun
中科院分区：
文献类型：
--
作者：
Chen Xuan;Li Rui;Li Bin;Wang Juan;Gong Yichao;Wang Tao;Zhang Guojun
采用原位反应法制备了三种不同Mo2C含量的钼基复合材料，并在1700 °C下进行热压烧结。显微组织分析结果表明，微米和亚微米Mo2C颗粒分布均匀，与基体结合良好，界面无裂纹和气孔。原位Mo2C的良好分散导致基体晶粒细化，并显着增强复合材料。随着Mo2C含量的增加，复合材料的硬度逐渐增加。当Mo_2C含量超过8.8vol%时，屈服强度显著提高。特别是经高能球磨处理的含13.7vol%Mo2C的Mo基复合材料的显微硬度（312HV0.3）和屈服强度（1013MPa）分别是纯Mo的1.6倍和2.8倍。对强化机制的定量分析表明，高屈服强度是由于晶粒细化和位错在Mo2C颗粒与Mo基体界面处堆积所致。此外，与4.9体积%和8.8体积%的Mo2C的复合材料表现出显着更大的应变硬化率作为位错相互作用和Mo2C颗粒的结果。
Molybdenum matrix composites with three different Mo2C contents were developed by in-situ reaction of Mo-graphene using hot pressing sintering at 1700 °C. Microstructure characterization results revealed that micron and submicron Mo2C particles were distributed homogeneously and well bonded with Mo matrix, without cracks or pores in the interface. The well dispersed in-situ Mo2C resulted in matrix grain refinement and significantly reinforced the composites. With increasing content of Mo2C, the hardness of composites was increased gradually. And when the Mo2C content raised above 8.8 vol%, the yield strength was enhanced remarkably. Especially, the microhardness (312 HV0.3) and yield strength (1013 MPa) of Mo matrix composite with 13.7 vol% Mo2C processed by high energy ball milling were 1.6 and 2.8 times that of the pure Mo, respectively. Quantitative analysis of strengthening mechanisms indicated that the high yield strength was attributed to grain refinement and dislocation piling up at the interface between Mo2C particles and Mo matrix. Moreover, the composites with 4.9 vol% and 8.8 vol% Mo2C exhibited noticeably greater strain hardening rates as a result of interaction of dislocations with each other and Mo2C particles.
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