Low-temperature crystallization caused by ultrasound in Pd42.5 Ni7.5 Cu30 P20 and Pd40 Ni40 P20 bulk metallic glasses

Ichitsubo, Tetsu; Matsubara, Eiichiro; Anazawa, K.; Nishiyama, Nobuyuki; Naito, Makio; Hirotsu, Yoshihiko

doi:10.1016/j.msea.2006.01.149

Cited by 10 publications

(5 citation statements)

References 19 publications

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“…[11][12][13][14] Similar phenomena were reported. Kopcewicz et al showed lots of works on the effects of radio-frequency ͑rf͒ magnetic field on crystallization of some ferrous amorphous alloys.…”

Section: Introductionsupporting

confidence: 87%

“…Under US perturbation, the crystallization is very much accelerated. As shown elsewhere, 14 we have also investigated the crystalline phases formed under US perturbation and concluded that the US annealing merely enhances the crystallization rate but produces no particular phases.…”

Section: A Experimental Proceduresmentioning

confidence: 53%

“…4. On the basis of the experimental facts that ͑i͒ the US-induced crystalline phases possess a similar composition to the initial amorphous matrix 14 and ͑ii͒ the crystallization time under US vibrations becomes shorter as the US-strain amplitude is larger ͓Fig. 1͑b͔͒, we can suppose that crystallization is further assisted by collective vibrational motions of SBRs.…”

Section: Collective Vibrational Motions Of Strongly Bonded Regionsmentioning

confidence: 97%

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Structural instability of metallic glasses under radio-frequency-ultrasonic perturbation and its correlation with glass-to-crystal transition of less-stable metallic glasses

Ichitsubo

Matsubara

Chen³

et al. 2006

The Journal of Chemical Physics

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It has been reported that the structural stability is significantly deteriorated under radio-frequency-ultrasonic perturbation at relatively low temperatures, e.g., near/below the glass transition temperature T(g), even for thermally stable metallic glasses. Here, we consider an underlying mechanism of the ultrasound-induced instability, i.e., crystallization, of a glass structure to grasp the nature of the glass-to-liquid transition of metallic glasses. Mechanical spectroscopy analysis indicates that the instability is caused by atomic motions resonant with the dynamic ultrasonic-strain field, i.e., atomic jumps associated with the beta relaxation that is usually observed for low frequencies of the order of 1 Hz at temperatures far below T(g). Such atomic motions at temperatures lower than the so-called kinetic freezing temperature T(g) originate from relatively weakly bonded (and/or low-density) regions in a nanoscale inhomogeneous microstructure of glass, which can be straightforwardly inferred from a partially crystallized microstructure obtained by annealing of a Pd-based metallic glass just below T(g) under ultrasonic perturbation. According to this nanoscale inhomogeneity concept, we can reasonably understand an intriguing characteristic feature of less-stable metallic glasses (fabricated only by rapid melt quenching) that the crystallization precedes the glass transition upon standard heating but the glass transition is observable at extremely high rates. Namely, in such less-stable metallic glasses, atomic motions are considerably active at some local regions even below the kinetic freezing temperature. Thus, the glass-to-crystal transition of less-stable metallic glasses is, in part, explained with the present nanoscale inhomogeneity concept.

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Section: Introductionsupporting

confidence: 87%

Section: A Experimental Proceduresmentioning

confidence: 53%

Section: Collective Vibrational Motions Of Strongly Bonded Regionsmentioning

confidence: 97%

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Structural instability of metallic glasses under radio-frequency-ultrasonic perturbation and its correlation with glass-to-crystal transition of less-stable metallic glasses

Ichitsubo

Matsubara

Chen³

et al. 2006

The Journal of Chemical Physics

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“…According to his report, the rapid crystallization caused by ultrasound waves is considered to enhance the nucleation process rather than the growth stage. The same ultrasound-induced crystallization has been recently reported in the metallurgy field; however, the detailed mechanism is still unclear [24][25][26].…”

Section: Discussionmentioning

confidence: 52%

Study on Enhancement of Osseointegration of the Bio-Active Titanium Implant by Low Intensive Ultrasound WaveFull Text

Kobayahsi¹

2017

IJBES

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“…showed apatite deposition from SBF as evaluation method of the bioactive biomaterials in vitro, described physical deposition as the mechanism of bone formation from SBF to material surface of PO 2-, Ca 2+ and other and crystallization process [9]. This deposition process of apatite was physical and chemical changes without however, the detailed mechanism is still unclear [11,12].…”

Section: Discussionmentioning

confidence: 99%

The Comparison of Bone-Like Apatite Formation on Two Kinds of Bio-Active Material Surface Under the Low-Intensive Pulsed Ultrasound Waving (LIPUS) for Osseointegration

Kobayashi¹

2020

BJSTR

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Excellent osteoconductivity or osseointegration of biomaterial is very important for the stability of artificial joints and dental implants in clinical field.Against this background, We have already reported that the low-intensive pulsed ultrasound wave stimulation (LIPUS) could accelerate the bone-like hydroxyapatite precipitation on the bioactive material surface, which corresponds to osseointgration. The purpose of this study was to investigate the difference between the kinds of biomaterials the osseointegration enhanced by LIPUS in vitro. Hydroxyapatite (99.9%) and Bio-active titanium were soaked in simulated body fluid under the LIPUS radiation, and accessed by scanning electron microscope and X-ray diffraction, the mass of precipitation was measured.In a result, bio-active titanium showed the more rich bone-like apatite formation on the surface than hydroxyapatite. These facts suggested that the formation of bone-like apatite might depend on the initial epitaxial nucleation growth on the biomaterial surface.

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Low-temperature crystallization caused by ultrasound in Pd42.5 Ni7.5 Cu30 P20 and Pd40 Ni40 P20 bulk metallic glasses

Cited by 10 publications

References 19 publications

Structural instability of metallic glasses under radio-frequency-ultrasonic perturbation and its correlation with glass-to-crystal transition of less-stable metallic glasses

Structural instability of metallic glasses under radio-frequency-ultrasonic perturbation and its correlation with glass-to-crystal transition of less-stable metallic glasses

Study on Enhancement of Osseointegration of the Bio-Active Titanium Implant by Low Intensive Ultrasound WaveFull Text

The Comparison of Bone-Like Apatite Formation on Two Kinds of Bio-Active Material Surface Under the Low-Intensive Pulsed Ultrasound Waving (LIPUS) for Osseointegration

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