Authored by Yefei Li
Short Communication
In recent decades, ceramic particles reinforced iron matrix
composites (CPRIMCs) are regarded as the main achievements
in wear resistant materials area [1-3]. Among many iron matrix
composites, Tib2 ceramic reinforced Fe matrix composite (Tib2/
Fe) behaves large elastic modulus, high mechanical strength, and
advanced hardness and wear resistance [4,5]. Additionally, the
high electrical conductivity of Tib2 ceramic [6] enables machining
of Tib2/Fe composite easily using electrical discharge machining.
Agarwal and Dahotre [7] discussed the reinforcing mechanism of
Tib2/Fe composite, the epitaxial growth of iron on Tib2 particles
is revealed, and the orientation relationship was found as Tib2
(0001)/Fe (111). However, much less information is available
for the effects of alloying elements on the properties of Tib2/Fe
interface.
We use the method proposed in [8] to investigate the atomic
structures, chemical bonding, stability and fracture mechanism of
Tib2/Fe composite. It is found that B-terminated interface with HCP
site behaves the most stable nature and belongs to non-diffusive
configuration. Based this configuration, the segregation behavior of
alloying additives X (X=Si, Al, Cr, Mn, Ni, Mo) on the interface of Tib2
ceramic reinforced iron matrix composite as well as the effects of
these additives on the interfacial adhesion, electronic and magnetic
properties were studied. The results indicated that Cr, Mn and Mo
may segregate at the Tib2 (0001)/Fe (111) interface because of
their low heat of segregation barrier (Figure 1).
Moreover, compared with the work of adhesion of different
alloying doping interfaces, the introduction of Cr, Mn improves
the adhesive strength of Tib2(0001)/Fe (111) interface through
strong covalent interactions between Cr/Mn and B atoms. The
best strengthening effect on Tib2 (0001)/Fe (111) interface can
be attributed to Mn because of the highest interfacial work of
adhesion and critical stress of Mn-doped interface; we also found
the interfacial work adhesion energy is high than fracture energy
of Tib2 and Fe slabs, indicating the mechanical strength of the
interface is more remarkable than both Tib2 and Fe bulks, and the
mechanical failure will initiate at the Fe interior.
Conclusion
From the soft carbons/graphite to carbon nanostructures,
such as graphene/CNTs/graphdiyne and nanocomposites with
CNTs/graphene, the capacities have been boosted obviously and
thus the performance of anode has been enhanced. Nano carbons
can be also used in cathode as efficient conductive additives. It is
foreseeable that Nano carbons will make a major role in the coming
new-generation LIBs.
Acknowledgements
This work was supported by the Natural Science Foundation
of Shaanxi Province of China (2018JM5002), the Key Research
and Development Program of Shaanxi Province of China (2019GY-
182), the Postdoctoral Science Foundation funded Project of China
(No. 2018M631152, 2018T111051), the Postdoctoral Science
Foundation funded Project of Shaanxi Province of China, the Fundamental Research Funds for the Central Universities of China
(xzy012019001), the Guangxi Innovation Driven Development
Project (GUIKEAA18242001).
Conflict of Interest
No conflict of interest.
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