Strengthened Ti(C, N)-based cermets using high-energy ball-milled NiTiC binders: Microstructure and mechanical properties

Xiong, Huiwen; Wu, Yuxue; Gan, Xueping; Li, Zhiyou; Zhou, Kechao

doi:10.1016/j.ceramint.2018.06.080

Cited by 29 publications

(13 citation statements)

References 22 publications

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“…It is noteworthy that all cermets show the feature of bimodal grain size of hard phases, that is micron grains with thick rims on coarse cores and ultrafine grains with indistinct rims. The bimodal distribution of ceramic grains should be determined by the Ostwald Ripening mechanism: fine particles with high dissolution rate and the coarse grains as the preferred nucleation points for deposited rims …”

Section: Resultsmentioning

confidence: 99%

“…Although the starting materials are complicated, the final phases of the cermets are simple, containing two phases of (Ti,M)(C,N) and Ni‐Co. For (Ti,M)(C,N), the W/Mo/V/N shrink the lattice, while the Ta/Zr/Nb/C expand it . The lattice parameters of (Ti,M)(C,N) show linear relationship to the value of related 2 θ angles, which can be expressed as follows:

a = 8.5149 - 0.1004 b

where a is the lattice parameter of (Ti,M)(C,N), b is the value of 2 θ angles of (200) peak.…”

Section: Resultsmentioning

confidence: 99%

“…The differences in lattice parameters between bright rims and grey rims of CT/CV/CZ/CN are 0.059 Å/0.050 Å/0.082 Å/0.034 Å, respectively. In general, the lattice parameters of (Ti,M)(C,N)‐based rims are dependent on the concentration of atoms in solid solution, that is, W/Mo/V/N shrink the lattice, and Ta/Nb/Zr expand it …”

Section: Resultsmentioning

confidence: 99%

“…Rims improve the bonding strength between Ti(C,N) and Ni/Co, and inhibit the coalescence of cores, resulting in the formation of uniform microstructure . However, owing to the lattice misfit and internal stress at the core‐rim interfaces, cermets with modified core‐rim structure have been attracting much attentions …”

Section: Introductionmentioning

confidence: 99%

“…However, to date, few works concerning the relationship between the secondary cubic carbides and core‐rim structure have been investigated . Moreover, our previous work infers that these cubic carbides should affect the lattice parameters and composition of the rims in different ways.…”

Section: Introductionmentioning

confidence: 99%

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Ti(C,N)‐based cermets with strengthened interfaces: Roles of secondary cubic carbides

et al. 2019

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Core‐rim structure, concerning its interface structure and internal stress, plays an important role in mechanical performance of Ti(C,N)‐based cermets. Four types of cermets containing equimolar TaC, VC, ZrC, and NbC were fabricated, in order to reveal the synergetic relationship between core‐rim structure and mechanical properties. VC and ZrC effectively inhibited the grain growth, while TaC and NbC favored for coarser core‐rim grains. A thin distortion layer at the rim‐binder interface was confirmed, formed during the solidifying stage. Compared to the TaC, ZrC and NbC, VC shrunk the lattice parameters of rims and effectively decreased the lattice misfit of the distortion zone from around 4.0%‐0.8%. Cermets containing VC showed satisfactory bending strength of 2099 MPa and toughness of 10. 3 MPa m1/2, owing to the strengthened rim‐binder interface. TaC and NbC exhibited the similar roles in cermets with comparable mechanical properties, while addition of ZrC increased the lattice misfit of core‐rim structure, resulting in poor mechanical performance. Decreased lattice misfit of rim‐binder interface changed the fracture mode of cermets from intergranular to transgranular fracture, with in‐situ formed dimples.

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Section: Resultsmentioning

confidence: 99%