Supercooling investigation and critical cooling rate for glass formation in Pd–Cu–Ni–P alloy

Nishiyama, Nobuyuki; Inoue, Akihisa

doi:10.1016/s1359-6454(99)00030-0

Cited by 148 publications

(84 citation statements)

References 17 publications

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“…In this work, no clear endothermic peak due to glass transition was observed similar to the observation reported by Park et al [24]. Therefore, the onset of crystallization temperature T x , and the first and second peak temperatures T p1 and T p2 , respectively, of crystallization were selected as the specific temperatures for evaluating the activation energies of crystallization for [38][39][40]. The low activation energy of crystallization may be attributed to the presence of pre-quenched icosahedral clusters in as-cast amorphous alloy.…”

Section: Resultssupporting

confidence: 67%

Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation

Misra

Sohn

Kim

et al. 2008

Science and Technology of Advanced Materials

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The plastic deformation of Ti 45 Zr 16 Be 20 Cu 10 Ni 9 bulk metallic glass has been investigated by nanoindentation performed with loads ranging from 10 to 200 mN in a wide range of loading rates. The plastic flow in the alloy exhibited conspicuous serrations at low loading rates. The serrations, however, became less prominent as the rate of indentation increased. Atomic force microscopy showed a significant pile-up of materials around the indents, indicating that a highly localized plastic deformation occurred under nanoindentation. The possible mechanism governing the plastic deformation in bulk metallic glass specimens is tentatively discussed in terms of strain-induced free volume.

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Section: Resultssupporting

confidence: 67%

Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation

Misra

Sohn

Kim

et al. 2008

Science and Technology of Advanced Materials

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“…The magnitude of this ⌬T value is the largest known value for a bulk metallic glass, surpassing the ⌬T value reported for ''fluxed'' Pd 40 Cu 30 Ni 10 P 20 specimens, which have a critical cooling rate of less than 1 K/s. 10 The DSC trace for the Vit 4 composition begins to display a high temperature shoulder beyond the primary crystallization event, indicating that a small degree of phase separation may occur in this alloy. This is supported by unpublished threepoint beam bending viscosity measurements conducted on Vit 4 by Waniuk.…”

mentioning

confidence: 95%

Large supercooled liquid region and phase separation in the Zr–Ti–Ni–Cu–Be bulk metallic glasses

Hays¹,

Kim²,

Johnson³

1999

Applied Physics Letters

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Results of calorimetric, differential thermal analysis, and structural measurements are presented for a series of bulk metallic glass forming compositions in the Zr-Ti-Cu-Ni-Be alloy system. The calorimetric data for five alloys, prepared along the tie line between phase separating and nonphase separating compositions, show that the transition from phase separating to nonphase separating behavior is smooth. The bulk glasses near the center of the tie line exhibit large supercooled liquid regions: ⌬TϷ135 K, the largest known for a bulk metallic glass. © 1999 American Institute of Physics. ͓S0003-6951͑99͒01734-9͔There are a number of multicomponent bulk metallic glass ͑BMG͒ forming alloy systems, e.g., La-Ni-Al, 1 Zr-Al-Cu-Ni, 2 Zr-Ti-Cu-Ni-Be, 3 and Zr-Ti-Cu-Ni. 4 The Be-containing bulk glass Zr 41.2 Ti 13.8 Cu 12.5 Ni 10 Be 22.5 ͑Vit 1͒ exhibits an exceptional glass forming ability ͑GFA͒ and thermal stability with respect to crystallization. The liquidstate viscosity of the Be-BMG alloys is Ϸ two orders of magnitude higher than in pure metals or alloys, typically (Be-BMG)Ϸ5 poise. 5 The high melt viscosities of the Be-BMG compositions yield very sluggish crystallization kinetics in the supercooled liquid region ͑SLR͒. The crystallization behavior of Vit 1 has been determined by electrostatic levitation ͑ESL͒ and calorimetric methods. 6,7 These results, when combined with the results of small angle neutron scattering ͑SANS͒ measurements conducted by Schneider, Johnson, and Thiyagarajan show that primary crystallization is preceded by phase separation in the SLR. 8 This phase separation process shows many of the features of a spinodal decomposition, with a spinodal temperature of Ϸ 671 K. The decomposition process is followed by the nucleation of fcc nanocrystals on a length scale correlated with the spinodal wavelength, s Ϸ14 nm. The bulk glass Zr 46.75 Ti 8.25 Cu 7.5 Ni 10 Be 27.5 ͑Vit 4͒ also exhibits an excellent GFA. This alloy exhibits little phase separation prior to crystallization. To elucidate this behavior, results of thermophysical property measurements are presented for compositions along the tie line between the compositions of Vit 1 and Vit 4, the phase separating and nonphase separating alloys, respectively. The thermophysical property data show that through controlled changes in alloy composition the GFA may be altered drastically. The experimental data are related to the known features of the Vit 1 time-temperaturetransformation ͑TTT͒ diagram determined from the ESL measurements.The details of the methods used to prepare the master alloys are described elsewhere. 9 The tie-line alloy compositions were prepared in the form of thin strips, 1ϫ5ϫ Ϸ25 mm ͑thickness by width by length͒, by injection casting into a Cu metal mold. The specimen compositions prepared along the tie line from Vit 1 to Vit 4, labeled Vit 1, 1͑a͒, 1͑b͒, 1͑c͒, and 4, respectively, are presented in Table I. The nominal compositions are used in this letter. The strategy employed in this alloy series involves incrementally changin...

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“…[1][2][3][4][5][6] The exceptional large glassforming ability (GFA) has enabled us to investigate the nature of the undercooled melt. [7][8][9][10] Recently, Schroers et al reported that a slightly lower R c of 0.09 K/s was obtained for a similar Pd 43 Cu 27 Ni 10 P 20 alloy.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, we have found that a new Pd 42. 5 Cu 30 Ni 7.5 P 20 alloy (PCNP-3) has the lowest R c of 0.067 K/s. 13) The improvement in R c is caused by optimization of the alloy composition to just eutectic composition.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth Behavior of Undercooled Pd42.5Cu30Ni7.5P20 Melt

Nishiyama

Inoue

2002

Mater. Trans.

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An undercooled Pd 42.5 Cu 30 Ni 7.5 P 20 melt with a eutectic composition exhibits the lowest critical cooling rate for glass formation of 0.067 K/s. Nucleation and crystal growth behaviors of the undercooled melt were investigated at 683 K where the temperature is close to nose temperature. Nucleation frequency and crystal growth rate were evaluated as 4.77 × 10 9 /m 3 ·s and 3.24 × 10 −7 m/s, respectively. These values are almost the same as those for the undercooled Pd 40 Cu 30 Ni 10 P 20 melt which has a slightly off-eutectic composition. However, the difference in incubation time for crystallization and nucleation mode was observed in both melts. Based on these results, the compositional effect on the stability of undercooled melt is discussed in the present study.

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Supercooling investigation and critical cooling rate for glass formation in Pd–Cu–Ni–P alloy

Cited by 148 publications

References 17 publications

Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation

Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation

Large supercooled liquid region and phase separation in the Zr–Ti–Ni–Cu–Be bulk metallic glasses

Nucleation and Growth Behavior of Undercooled Pd<SUB>42.5</SUB>Cu<SUB>30</SUB>Ni<SUB>7.5</SUB>P<SUB>20</SUB> Melt

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Supercooling investigation and critical cooling rate for glass formation in Pd–Cu–Ni–P alloy

Cited by 148 publications

References 17 publications

Rate-dependent serrated flow and plastic deformation in Ti45Zr16Be20Cu10Ni9bulk amorphous alloy during nanoindentation

Rate-dependent serrated flow and plastic deformation in Ti45Zr16Be20Cu10Ni9bulk amorphous alloy during nanoindentation

Large supercooled liquid region and phase separation in the Zr–Ti–Ni–Cu–Be bulk metallic glasses

Nucleation and Growth Behavior of Undercooled Pd<SUB>42.5</SUB>Cu<SUB>30</SUB>Ni<SUB>7.5</SUB>P<SUB>20</SUB> Melt

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Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation

Rate-dependent serrated flow and plastic deformation in Ti₄₅Zr₁₆Be₂₀Cu₁₀Ni₉bulk amorphous alloy during nanoindentation