Extreme hardening of titanium with colossal interstitial contents of nitrogen and oxygen

Kværndrup, Frederik B.; Kücükyildiz, Ömer C.; Winther, Grethe; Somers, Marcel A. J.; Christiansen, Thomas

doi:10.1016/j.msea.2021.141033

Cited by 18 publications

(13 citation statements)

References 37 publications

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“…The TiO phase also strongly increases the indentation modulus. From 600 to 850 • C the hardness and indentation modulus display similar increases with the c/a ratio as presented in [26], and suggest that the interstitial content at 900 -1100 • C is higher or close to the maximum y O content from literature (y O 0.5 [19]). The effect of anisotropy and difference in grain orientation is reflected by the standard deviation, while the effect of the TiO plates inside the α-Ti grains from 900 -1100 • C, leads to a sharp increase in standard deviation, because both phases are measured simultaneously, but to different degrees in differently oriented grains.…”

Section: Nanoindentationsupporting

confidence: 77%

“…The hardness displays a linear dependence on the c/a ratio up to 850 • C, while the hardness increases sharply at 900 -1100 • C, due to the inherent hardness of the TiO phase. The indentation modulus displays a similar linear increase with c/a ratio, although there is a slight decrease at low content, which is due to the slight contraction in a [26]. The TiO phase also strongly increases the indentation modulus.…”

Section: Nanoindentationmentioning

confidence: 78%

“…Hardness values were obtained from the indentation data, using the method due to Dao et al [25]. For this purpose on average 50 validated indents were performed in the center of the foils along multiple grains and orientations (for a detailed description of the procedure see [26]). The indentation results were calibrated on fused silica an integrated into the quantification method.…”

Section: Nanoindentationmentioning

confidence: 99%

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Kinetics of interstitial uptake during gaseous carbo-oxidizing of titanium foils

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Section: Nanoindentationsupporting

confidence: 77%

Section: Nanoindentationmentioning

confidence: 78%

Section: Nanoindentationmentioning

confidence: 99%

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Kinetics of interstitial uptake during gaseous carbo-oxidizing of titanium foils

et al. 2021

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“…According to the previous studies, [ 42,43 ] the contribution of per 1 wt% O interstitial solution to strength is 769 MPa, and the strengthening effect of N in α‐Ti is roughly twice than that of O. [ 44 ] (3)Load transfer strengthening. According to TEM results analysis (Figure 3), the TiC particles and Ti matrix has a strong interfacial bonding.…”

Section: Discussionmentioning

confidence: 99%

High Strength and High Wear‐Resistant Ti Composites Fabricated by Powder Metallurgy Pressureless Sintering

Liu

Sun

Kuang

et al. 2022

Adv Materials Technologies

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In this work, high strength and high wear‐resistant titanium matrix composites (TMCs) reinforced with in situ TiC derived from pyrolysis of polysilazane (PSZ) are fabricated successfully. The processing technology is developed with a novel powder metallurgy method combining solution‐assisted wet mixing and pressureless sintering. The effects of PSZ addition on the microstructure, hardness, mechanical properties, and tribological properties are systematically studied. The TMCs possess better comprehensive properties compared to conventional ex situ methods. The pyrolysis of PSZ leads to the formation of TiC particles and N, Si atoms solid‐solution in the Ti matrix. The microstructure of the composites is homogenous and fine‐grained. The average grain size of α‐Ti decreases significantly from 106.1 µm of pure Ti to 37.2 µm of the 1.5 wt% PSZ/Ti composite. Among these TMCs, the 1.5 wt% PSZ/Ti composite displays comprehensively excellent mechanical properties with the ultimate tensile strength (UTS) of 711 MPa, yield strength (YS) of 568 MPa, and elongation (EL) of 8.0%. In addition, the composite possesses a high wear resistance with a low specific wear rate of 0.355 × 10−12 m3 N−1 m−1 under constant condition (0.03 m s−1, 2N).

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“…Moreover, complex-shaped metal components are much cheaper than their equivalent ceramic ones. In this applicative domain, titanium alloys are by far the most interesting choice and can give rise to a tremendous amount of research (see, for example, [ 3 , 8 , 25 , 26 , 39 , 42 , 43 , 50 , 62 ]).…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

Low Temperature Nitriding of Metal Alloys for Surface Mechanical Performance

Drouet

Bourhis

2023

Materials

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Metallic alloys are, by essence, ductile and stiff and can support loads without sudden rupture. This ductility becomes a disadvantage when applications require wear resistance. In this case, the hardening of the surface is required while retaining a core performance. Here, nitriding at low temperatures has proven to be beneficial and has potential. In fact, any phase transitions or unwanted compound precipitations that occur at higher temperatures have to be avoided as they would have a deleterious effect on the chemical homogeneity and mechanical properties. The present contribution summarizes the achievements made with such treatments on metallic alloys. We considered the most popular treatments, namely plasma, implantation, and gas nitridings.

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Extreme hardening of titanium with colossal interstitial contents of nitrogen and oxygen

Cited by 18 publications

References 37 publications

Kinetics of interstitial uptake during gaseous carbo-oxidizing of titanium foils

Kinetics of interstitial uptake during gaseous carbo-oxidizing of titanium foils

High Strength and High Wear‐Resistant Ti Composites Fabricated by Powder Metallurgy Pressureless Sintering

Low Temperature Nitriding of Metal Alloys for Surface Mechanical Performance

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