Small atoms as reinforced agent for both hardness and toughness of Group-VIB transition metal films

Yang, Lina; Liu, Chang; Wen, Mao; Xuan, Dong; Zhang, Yuji; Chen, Xingqian; Zhang, Kan

doi:10.1016/j.jallcom.2017.11.208

Cited by 22 publications

(5 citation statements)

References 44 publications

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“…Notably, the E varies in the opposite trend to hardness once the special structure is formed compared with pure TaN; specifically, it decreases from 300.5 ± 2.51 GPa for pure TaN to 254.3 ± 1.92, 233.8 ± 2.42, and 241.6 ± 2.60 GPa when N/A is 0.77, 0.50, and 0.31, respectively. Pure W exhibits a much lower value at 210.0 ± 8.31 GPa . Particularly, the E of pure TaN obtained here can be confirmed both experimentally and theoretically. , That is, one can obtain improved H but reduced E and thus higher H / E values.…”

Section: Resultssupporting

confidence: 79%

“…Pure W exhibits a much lower value at 210.0 ± 8.31 GPa. 49 Particularly, the E of pure TaN obtained here can be confirmed both experimentally and theoretically. 48,50 That is, one can obtain improved H but reduced E and thus higher H/E values.…”

Section: Hardness and Elasticity Modulussupporting

confidence: 77%

“…Then, it increases to the maximum value of 27.8 ± 0.52 GPa when N/A is 0.77, and it drops slightly to 26.8 ± 0.49 and 26.4 ± 0.41 GPa as N/A further decreases to 0.50 and 0.31, respectively. In the case of pure W (at 0.0 position of x -axis), the lowest hardness of 14.09 ± 0.51 GPa is exhibited . Obviously, the coatings with the above structure possess enhanced hardness than that of pure TaN and W coatings, being 1.1 and 2.0 times higher, respectively.…”

Section: Resultsmentioning

confidence: 93%

“…In the case of pure W (at 0.0 position of x-axis), the lowest hardness of 14.09 ± 0.51 GPa is exhibited. 49 Obviously, the coatings with the above structure possess enhanced hardness than that of pure TaN and W coatings, being 1.1 and 2.0 times higher, respectively. Notably, the E varies in the opposite trend to hardness once the special structure is formed compared with pure TaN; specifically, it decreases from 300.5 ± 2.51 GPa for pure TaN to 254.3 ± 1.92, 233.8 ± 2.42, and 241.6 ± 2.60 GPa when N/A is 0.77, 0.50, and 0.31, respectively.…”

Section: Hardness and Elasticity Modulusmentioning

confidence: 95%

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Ultrafine Ceramic Grains Embedded in Metallic Glass Matrix: Achieving Superior Wear Resistance via Increase in Both Hardness and Toughness

Yang

Wen

Xuan

et al. 2018

ACS Appl. Mater. Interfaces

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As structural materials, crystalline or metallic glass materials have attracted scientific and practical interests. However, some mechanisms involving critical size and shear bands have adverse effects on their mechanical properties. Here, we counter these two effects by introducing a special structure with ultrafine ceramic grains (with a diameter of ∼2.0 nm) embedded into a metallic glass matrix, wherein the grains are mainly composed of a Ta-W-N solid solution structure in nature, surrounded by a W-based amorphous matrix that contains Ta and N atoms. Such a structure is in situ formed during preparation, which combines the merits of both phases to achieve simultaneous increase in hardness and toughness relative to references (pure TaN and W) and thus superior wear resistance. Even more remarkable, a favorable variation of increased hardness but reduced elasticity modulus can be induced by this structure. Intrinsically, ultrafine ceramic grains (free of dislocations), embedded in the metallic glass matrix, could prevent shear band propagation within the glass matrix and further improve the hardness of the matrix material. In return, such glass matrix allows for stiffness neutralization and structural relaxation to reduce the elasticity modulus of ceramic grains. This study will offer a new guidance to fabricate ultrahigh-performance metal-based composites.

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Section: Resultssupporting

confidence: 79%

Section: Hardness and Elasticity Modulussupporting

confidence: 77%

Section: Resultsmentioning

confidence: 93%

Section: Hardness and Elasticity Modulusmentioning

confidence: 95%

See 2 more Smart Citations

Ultrafine Ceramic Grains Embedded in Metallic Glass Matrix: Achieving Superior Wear Resistance via Increase in Both Hardness and Toughness

Yang

Wen

Xuan

et al. 2018

ACS Appl. Mater. Interfaces

Self Cite

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“…This suggests that ceramic hardness can be combined with metallic toughness in carbon-containing bcc structures. Previous studies have shown similar results when alloying group six metals with p-block elements and it was suggests that the toughening effect is caused by the non-columnar microstructure 25 , 35 . However, we observe toughness in highly columnar films.…”

Section: Discussionsupporting

confidence: 53%

Hard and crack resistant carbon supersaturated refractory nanostructured multicomponent coatings

Fritze

Malinovskis

Riekehr

et al. 2018

Sci Rep

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The combination of ceramic hardness with high crack resistance is a major challenge in the design of protective thin films. High entropy alloys have shown in earlier studies promising mechanical properties with a potential use as thin film materials. In this study, we show that small amounts of carbon in magnetron-sputtered multicomponent CrNbTaTiW films can lead to a significant increase in hardness. The film properties were strongly dependent on the metal composition and the most promising results were observed for TaW-rich films. They crystallised in a bcc structure with a strong (110) texture and coherent grain boundaries. It was possible to deposit films with 8 at.% C in a supersaturated solid-solution into the bcc structure without carbide formation. A major effect of carbon was a significant grain refinement, reducing the column diameter from approximately 35 to 10 nm. This resulted in an increase in hardness from 14.7 to 19.1 GPa while the reduced E-modulus stayed constant at 322 GPa. The carbon-containing films exhibited extremely little plastic deformation around the indent and no cracks were observed. These results show that supersaturation of carbon into high entropy films can be a promising concept to combine superior hardness with high crack resistance.

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TiMoN nano-grains embedded into thin MoS -based amorphous matrix: A novel structure for superhardness and ultra-low wear

Yang

Wen

Chen

et al. 2018

Applied Surface Science

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Small atoms as reinforced agent for both hardness and toughness of Group-VIB transition metal films

Cited by 22 publications

References 44 publications

Ultrafine Ceramic Grains Embedded in Metallic Glass Matrix: Achieving Superior Wear Resistance via Increase in Both Hardness and Toughness

Ultrafine Ceramic Grains Embedded in Metallic Glass Matrix: Achieving Superior Wear Resistance via Increase in Both Hardness and Toughness

Hard and crack resistant carbon supersaturated refractory nanostructured multicomponent coatings

TiMoN nano-grains embedded into thin MoS -based amorphous matrix: A novel structure for superhardness and ultra-low wear

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