Fabrication of CuZr(Al) bulk metallic glasses by high pressure torsion

Yangshan, Sun; Nakamura, Tuto; Todaka, Yoshikazu; Umemoto, Minoru; Tsuji, Nobuhiro

doi:10.1016/j.intermet.2008.07.023

Cited by 32 publications

(17 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Disc with thickness of 0.85 mm sliced from the casting rods were subjected to HPT deformation using constrained-geometry anvils 12) under compressive pressure of 5 GPa at rotation speed of 1 rpm to 10 revolutions (N) at room temperature (298 K), 323 and 373 K. Sample deformed at 298 K for 50 revolutions was used for comparison. HPT at high temperature (> 298 K) was carried out by the furnace fixed on the upper anvil and the actual temperature evolution was recorded by a thermo couple embedded in the upper anvil.…”

Section: Methodsmentioning

confidence: 99%

Pronounced Structural Rejuvenation in Zr50Cu40Al10 Metallic Glass Strained by Torsional Straining at Elevated Temperature

2014

View full text Add to dashboard Cite

Zr 50 Cu 40 Al 10 metallic glass was deformed by high pressure torsion at different temperatures. Thermal analysis reveals that the structural relaxation peak is intensified not only by increasing rotation revolutions, but also raising deformation temperature. The relaxation enthalpy in the sample deformed at 373 K for 10 revolutions shows similar value to the one deformed at room temperature for 50 revolutions, suggesting the analogous structural rejuvenation. Extensive atomic movement leads to the pronounced structural rejuvenation when deformation was performed at elevated temperature but lower than the starting temperature of structural relaxation.

show abstract

Section: Methodsmentioning

confidence: 99%

Pronounced Structural Rejuvenation in Zr50Cu40Al10 Metallic Glass Strained by Torsional Straining at Elevated Temperature

2014

View full text Add to dashboard Cite

show abstract

“…Disks of 0.85 mm thick sliced from the rods were subjected to HPT deformation using constrainedgeometry anvils 18) under compressive pressure of 5 GPa at a rotation speed of 1 rpm to 10 and 20 revolutions. Before HPT deformation, Zr 50 Cu 44 Al 6 samples were dipped into liquid nitrogen, aiming to exclude the residual B2 ZrCu phase completely via martensitic transformation.…”

Section: Methodsmentioning

confidence: 99%

“…Liquid nitrogen was used to cool the anvils when deformation was carried out at T def < 306 K, and a cylindrical furnace fixed on the upper anvil was used to heat the anvils at T def > 306 K. The actual temperature evolution during HPT processing was recorded by a thermo couple embedded in the upper anvil. 18) Planar samples were mechanically ground down to roughly the median plane for X-ray diffraction (XRD) characterization, performed on RIGAKU RINT TTRIII diffractometer with CuK ¡ radiation (40 kV, 150 mA). Microstructural evolution was studied by optical microscopy (OM) and transmission electron microscopy (TEM).…”

Section: Methodsmentioning

confidence: 99%

Anomalous Temperature Dependence of Crystalline-to-Amorphous Transformation Induced by High-Pressure Torsion in Zr50(Cu,Al)50

et al. 2013

View full text Add to dashboard Cite

Martensite phases of Zr 50 Cu 50 and Zr 50 Cu 44 Al 6 were deformed by high-pressure torsion (HPT) at different temperatures ranging from 253 to 473 K. Microstructural observations revealed that the crystalline-to-amorphous transformation induced by HPT showed remarkable temperature dependence: an increase in deformation temperature up to 473 K significantly increased the fraction of the amorphous structure. This result suggests that the lattice instability near martensitic transformation temperature promotes crystalline-to-amorphous transformation, which is coherent to the generalized Lindemann criterion of defect-induced amorphization.

show abstract

“…There are numerous reports about the successful application of the HPT process for metals, intermetallics, and composites [8][9][10]. This method has also been employed for the production of bulk nanostructured NiTi.…”

Section: Introductionmentioning

confidence: 99%

Effect of high-pressure torsion on the microstructure and wear behavior of NiTi alloy

et al. 2015

View full text Add to dashboard Cite

The wear property of NiTi is one of the most important properties of this alloy. In the current study, the effect of high-pressure torsion (HPT) process on the wear properties of an austenitic NiTi shape memory alloy is investigated. Full density NiTi samples with a composition of Ti-56 wt% Ni are fabricated using hot isostatic pressing (HIP), followed by the HPT process at room temperature, with an applied pressure of 6 GPa for 10 turns. The microstructural analysis reveals that the HIP-processed samples with a B2-NiTi phase evolve into significant grain refinement after HPT process and an interwoven B2-B19′ nanocrystalline/amorphous structure formed, leading to increased hardness in these samples. The results of the wear tests using a ball-on-disc configuration at room temperature demonstrate that the wear performance of the samples is improved after the HPT process. This is due to greater hardness and better pseudo-elasticity in the HPT-processed samples.

show abstract

Fabrication of CuZr(Al) bulk metallic glasses by high pressure torsion

Cited by 32 publications

References 24 publications

Pronounced Structural Rejuvenation in Zr<sub>50</sub>Cu<sub>40</sub>Al<sub>10</sub> Metallic Glass Strained by Torsional Straining at Elevated Temperature

Pronounced Structural Rejuvenation in Zr<sub>50</sub>Cu<sub>40</sub>Al<sub>10</sub> Metallic Glass Strained by Torsional Straining at Elevated Temperature

Anomalous Temperature Dependence of Crystalline-to-Amorphous Transformation Induced by High-Pressure Torsion in Zr<sub>50</sub>(Cu,Al)<sub>50</sub>

Effect of high-pressure torsion on the microstructure and wear behavior of NiTi alloy

Contact Info

Product

Resources

About