High-strength materials produced by precipitation of icosahedral quasicrystals in bulk Zr–Ti–Cu–Ni–Al amorphous alloys

Xing, L. Q.; Eckert, J.; Löser, W.; Schultz, L.

doi:10.1063/1.122980

Cited by 223 publications

(93 citation statements)

References 18 publications

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“…This, so far, has been established for the fabrication of QC/metallic-glass nanocomposites. 20,21,29,30) Considering that nanocrystals can also be precipitated dynamically upon deformation in the alloys with x ¼ 5{17:5, we can expect the synergistic effect of nano-QC precipitation and the deformation-induced nanocrystallization for the improvement of mechanical property in the alloy system.…”

Section: Mechanical Properties Of In-situ Nano-qc Formedmentioning

confidence: 99%

Tailoring Thermally Induced Nano-Quasicrystallization and Deformation-Assisted Nanocrystallization for Mechanical Property Improvement in Zr-Al-Ni-Cu-Pd Bulk Metallic Glasses

et al. 2009

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The material design tailoring of a synergistic effect of an in-situ nano secondary phase formation and deformation-induced nanocrystallization for improving the mechanical strength and ductility, has been investigated in Zr 65 Al 7:5 Ni 10 Cu 17:5Àx Pd x bulk metallic glasses (BMGs). As-cast Zr 65 Al 7:5 Ni 10 Cu 17:5Àx Pd x (x ¼ 5{17:5) BMGs have significant ductility in compressive deformation, which is attributed to deformation-induced dynamic nanocrystallization. The 10 at% Pd-containing BMG with a low volume fraction of the quasicrystalline (QC) phase of less than 6% exhibits increases in strength and Young's modulus, in addition to a remaining plasticity of $5%, compared with the monolithic glassy alloy. Such improvements in the mechanical properties originate from the combination of two effects of in-situ homogeneous nano-QC formation and deformation-induced inhomogeneous nanocrystallization. The present method should be regarded as a new technique for the production of BMGs with high strength and good ductility.

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Section: Mechanical Properties Of In-situ Nano-qc Formedmentioning

confidence: 99%

Tailoring Thermally Induced Nano-Quasicrystallization and Deformation-Assisted Nanocrystallization for Mechanical Property Improvement in Zr-Al-Ni-Cu-Pd Bulk Metallic Glasses

et al. 2009

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“…The additional elements for the I-phase formation in the Zr-Al-Ni-Cu glassy alloy are summarized in Table 1. 8,9,11,12,[19][20][21][22][23][24] The table contains the atomic radius and mixing enthalpies with Zr, Al, Ni and Cu of the additional elements. It is found that all additional elements have weak or positive mixing enthalpies with one constitutional element at least in Zr-Al-Ni-Cu glassy alloy.…”

Section: Formation Factor For the I-phase In Zr-based Glassy Alloymentioning

confidence: 99%

Stability of Supercooled Liquid and Transformation Behavior in Zr-Based Glassy Alloys

2002

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We investigated the stability of the supercooled liquid in Zr-based glassy alloys by examination of their transformation behavior. The primary phase is an fcc Zr 2 Ni phase in a Zr 65 Al 7.5 Ni 10 Cu 17.5 glassy alloy with high glass-forming ability (GFA). By substitution of Ag, Pd, Au or Pt for only 1 at%Cu, an icosahedral quasicrystalline phase (I-phase) precipitates with the fcc Zr 2 Ni phase. The primary phase changes to the single I-phase at higher noble metal contents. It is further found that the I-phase precipitates by a small amount of substitution for Cu with other elements as well as the noble metals, which have a weak or positive chemical affinity with one of the constitutional elements in the Zr-Al-Ni-Cu glassy alloy. Thus, the slight deviation from the three component rules for high GFA is effective for the I-phase formation. The I-phase is also formed as a primary phase in the Zr 65+y Al 7.5 Ni 10 Cu 17.5−y (y = 1-7) glassy alloys. A slight change in the composition has the similar effect as the addition of element such as noble metals and so on. An icosahedron is contained as a structure unit in the fcc Zr 2 Ni and I-phases and hence the glassy structure is correlated with the local icosahedral atomic configuration. The high-resolution transmission electron microscopy image of the Zr 70 Al 7.5 Ni 10 Cu 12.5 glassy alloy reveals a possibility of the existence of the icosahedral ordered regions. It is therefore, concluded that the icosahedral short-or medium-range order exists in the supercooled liquid as well as in the glassy phase and it stabilizes the supercooled liquid state in the Zr-based alloys. An I-phase also precipitates as a primary phase by substituting Pd, Au or Pt for only 1 at%Cu in the Zr 70 Cu 30 glassy alloy. From these results, the appearance of the supercooled liquid region is attributed to the existence of the icosahedral atomic configuration consisting of Zr and Cu.

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“…glasses with a critical casting thickness of 1 mm or greater. Icosahedral quasicrystal phases (i-phases) are frequently found in crystallized Zr-based BMG's, [3][4][5][6][7] suggesting that these amorphous structures have a high degree of icosahedral short-range order (ISRO). This is supported by recent highenergy synchrotron X-ray diffraction studies of Zr/Ti-based liquids and glasses, which have linked supercooling and the glass transition to an increase in icosahedral and icosahedral-like local order.…”

Section: Introductionmentioning

confidence: 99%

Short- and medium-range order in Zr80Pt20liquids

Mauro¹,

Wessels

Bendert³

et al. 2011

Phys. Rev. B

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The atomic structures in equilibrium and supercooled liquids of Zr 80 Pt 20 were determined as a function of temperature by in-situ high-energy synchrotron diffraction studies of the levitated liquids (containerless processing) using the beamline electrostatic levitation (BESL) technique. The presence of a pronounced pre-peak at q ~ 1.7 Å -1 in the static structure factor indicates medium range order (MRO) in the liquid. The position and intensity of the pre-peak remain constant with cooling, indicating that the MRO is already present in the liquid above its melting temperature. An analysis of the liquid atomic structures obtained using the Reverse Monte Carlo (RMC) method utilizing both the structure factor, S(q), from x-ray diffraction experiments and the partial pair-correlation functions from ab initio molecular dynamics (MD) simulations show that the pre-peak arises from a Pt-Pt correlation that can be indentified with icosahedral short-range order around the Pt atoms. The local atomic ordering is dominated by icosahedral-like structures, raising the nucleation barrier between the liquid and these phases, thus assisting glass formation.

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High-strength materials produced by precipitation of icosahedral quasicrystals in bulk Zr–Ti–Cu–Ni–Al amorphous alloys

Cited by 223 publications

References 18 publications

Tailoring Thermally Induced Nano-Quasicrystallization and Deformation-Assisted Nanocrystallization for Mechanical Property Improvement in Zr-Al-Ni-Cu-Pd Bulk Metallic Glasses

Tailoring Thermally Induced Nano-Quasicrystallization and Deformation-Assisted Nanocrystallization for Mechanical Property Improvement in Zr-Al-Ni-Cu-Pd Bulk Metallic Glasses

Stability of Supercooled Liquid and Transformation Behavior in Zr-Based Glassy Alloys

Short- and medium-range order in Zr80Pt20liquids

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