Relaxation time and molar free energy of activation for some rare-earth complexes of kaolinite

Mahan, M. K.; Jha, B. L.

doi:10.1007/bf00752146

Cited by 10 publications

(9 citation statements)

References 3 publications

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“…This critical casting thickness value is higher than critical casting thicknesses of most of the refractory metal based metallic glasses [2][3][4][5][6][7][8][9][10]. This is due to the fact that liquidus temperatures of the alloys investigated in this study are much lower than those of other refractory metal based metallic glasses.…”

Section: Discussionmentioning

confidence: 69%

“…In fact, the second crystallization temperature of Ni46Cu5W31.6B17.4 alloy is lower than that of Ni51W31.6B17.4 alloy. Crystallization temperature of Ni46Cu5W31.6B17.4 alloy, 1063 K, is higher than those of many of the refractory metal based metallic glasses [2][3][4][5][6][7][8][9][10] and the highest value reported for a Ni-based metallic glass until now (Table 2). For a constant Tl, increasing Tg and Tx is expected to result in improved critical casting thickness.…”

Section: Discussionmentioning

confidence: 74%

“…In general, if a metallic glass alloy contains elements having high melting point, it is expected to have high crystallization temperature. For this reason, number of metallic glass alloys containing high amount of refractory metals, such as tungsten, ruthenium, rhenium, iridium, osmium, tantalum and niobium, have been studied in order to develop metallic glasses having high crystallization temperatures [2][3][4][5][6][7][8][9][10]. In these studies, metallic glasses which have crystallization temperatures higher than 1100-1200 K have been developed.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, microhardnesses of the refractory based metallic glasses determined to be between 1200-2000 Hv, which are much higher than almost all of the non-refractory metal based metallic glasses. Examinations of the compositions of the refractory metal based metallic glasses show that most of these alloys contain high amount of boron in addition to refractory metals [2][3][4][5][6][7][8][9][10]. This indicates that these alloys owe their attractive mechanical and thermal properties to strong bonds form between refractory metals and boron.…”

Section: Introductionmentioning

confidence: 99%

“…Although refractory metal based metallic glasses are superior to other metallic glasses in terms of mechanical properties and thermal stability, their critical casting thicknesses are quite low, which are less than 30 µm [2][3][4][5][6][7][8][9][10]. Such low critical casting thickness values prevent them from being used in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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A New Ni-Based Metallic Glass with High Thermal Stability and Hardness

Hitit

Şahin

Öztürk

et al. 2015

Metals

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Glass forming ability (GFA), thermal stability and microhardness of Ni51−xCuxW31.6B17.4 (x = 0, 5) metallic glasses have been investigated. For each alloy, thin sheets of samples having thickness of 20 µm and 100 µm were synthesized by piston and anvil method in a vacuum arc furnace. Also, 400 µm thick samples of the alloys were synthesized by suction casting method. The samples were investigated by X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). Crystallization temperature of the base alloy, Ni51W31.6B17.4, is found to be 996 K and 5 at.% copper substitution for nickel increases the crystallization temperature to 1063 K, which is the highest value reported for Ni-based metallic glasses up to the present. In addition, critical casting thickness of alloy Ni51W31.6B17.4 is 100 µm and copper substitution does not have any effect on critical casting thickness of the alloys. Also, microhardness of the alloys are found to be around 1200 Hv, which is one of the highest microhardness values reported for a Ni-based metallic glass until now.

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