Metallic glass formation in the binary Cu–Hf system

Figueroa, I.A.; Plummer, John; Lara-Rodríguez, G.A.; Novelo-Peralta, O.; Todd, Iain

doi:10.1007/s10853-012-6946-5

Cited by 14 publications

(24 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…| (χ a -χ x ) |/χ a vs. x for Cu-Zr[29] and Cu-Hf alloys (left scale) and |γ a -γ x |/γ a vs. x for Cu-Zr[28] alloys (right scale).The results shown in Figures 2 and 3 support a close connection between similar EBS in glassy and primary crystallized state and GFA in Cu-Zr, Hf alloys. A similar connection may exist also in other non-magnetic alloys of early transition metals with late transition metals in which the variations of properties with composition in glassy state are similar to those in Cu-Ti,…”

supporting

confidence: 63%

“…By using our results for the magnetic susceptibility of Cu-Hf alloys and the literature results for magnetic susceptibility [29], low temperature heat capacity [28] and atomic structure [25] of Cu-Zr alloys, we have shown that in both alloy systems the well known criterion for easy glass formation (similar free (internal) energies but quite different atomic arrangements in the glassy and competing crystalline state) explains quite well the variation of glass forming ability. In particular, we find that a change of magnetic susceptibility on crystallization quite accurately describes variation of glass forming ability with composition in both alloy systems.…”

Section: Resultsmentioning

confidence: 60%

“…In order to compare in a more quantitative way the results for Cu-Zr alloys [28,29] with present results for Cu-Hf alloys, we plot in Fig. 3 the variations with composition of fractional change in χ, |Δχ/χ a | and γ, |Δγ/γ a | for two alloy systems.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

On the origin of bulk glass forming ability in Cu-Hf, Zr alloys

Ristić¹,

Zadro²,

Pajić³

et al. 2016

EPL

View full text Add to dashboard Cite

Understanding the formation of bulk metallic glasses (BMG) in metallic systems and finding a reliable criterion for selection of BMG compositions are among the most important issues in condensed matter physics and material science. Using the results of magnetic susceptibility measurements performed on both amorphous and crystallized Cu-Hf alloys (30-70 at% Cu) we find a correlation between the difference in magnetic susceptibilities of corresponding glassy and crystalline alloys and the variation in the glass forming ability (GFA) in these alloys. Since the same correlation can be inferred from data for the properties associated with the electronic structure of Cu-Zr alloys, it seems quite general and may apply to other glassy alloys based on early and late transition metals. This correlation is plausible from the free energy considerations and provides a simple way to select the compositions with high GFA.

show abstract

supporting

confidence: 63%

Section: Resultsmentioning

confidence: 60%

See 1 more Smart Citation

On the origin of bulk glass forming ability in Cu-Hf, Zr alloys

Ristić¹,

Zadro²,

Pajić³

et al. 2016

EPL

View full text Add to dashboard Cite

show abstract

“…The systems are CuZr (refs 42 , 43 , 44 , 45 , 79 ), NiZr (ref. 46 ), CuHf (refs 65 , 80 , 81 ), AuSi (ref. 66 ), BeTi (ref.…”

Section: Resultsmentioning

confidence: 99%

Spectral descriptors for bulk metallic glasses based on the thermodynamics of competing crystalline phases

et al. 2016

View full text Add to dashboard Cite

Metallic glasses attract considerable interest due to their unique combination of superb properties and processability. Predicting their formation from known alloy parameters remains the major hindrance to the discovery of new systems. Here, we propose a descriptor based on the heuristics that structural and energetic ‘confusion' obstructs crystalline growth, and demonstrate its validity by experiments on two well-known glass-forming alloy systems. We then develop a robust model for predicting glass formation ability based on the geometrical and energetic features of crystalline phases calculated ab initio in the AFLOW framework. Our findings indicate that the formation of metallic glass phases could be much more common than currently thought, with more than 17% of binary alloy systems potential glass formers. Our approach pinpoints favourable compositions and demonstrates that smart descriptors, based solely on alloy properties available in online repositories, offer the sought-after key for accelerated discovery of metallic glasses.

show abstract

“…In recent years, the research in metallic glass formation has been focused on Cu-Hf and Cu-Zr based bulk metallic glasses (BMG, typically referred to a critical casting thickness larger than 1 mm) due to its critical glassy diameter, d c , and the low critical cooling rate, R c , required for vitrification. The glass forming ability, GFA, of binary alloys Cu 100-x Hf x (x=50, 45, 40, 35, 30 24 at.%) has been investigated and the maximum reliable, d c , obtained was 1 mm for the Cu 65 Hf 35 alloy 1 . The bulk glass formation in binary Cu-Zr system was studied for Cu 100−x Zr x (x=34, 36, 38.2, 40 at.%) by the copper mold casting method and the conclusion was that the GFA had a strong compositional dependence 2 .…”

Section: Introductionmentioning

confidence: 99%

Glass Formation of Null-Matrix Cu-Hf-(Zr, Ti) Alloys

Flores

Figueroa

2019

Mat. Res.

View full text Add to dashboard Cite

An approach following the null-matrix, Ti/Zr ratio of 2.08, for neutron diffraction was used to calculate the glass formation in Cu-Ti-(Hf,Zr) alloys. at. %), were calculated and prepared by argon arc melting. Copper die suction casting was employed to produce conical shaped samples with diameters decreasing from 8 mm to 1 mm. X-ray diffraction and Neutron Diffraction were used to characterize the alloys with the aim of obtaining the critical glassy diameter, dc, of the alloys. The results showed the composition with the biggest d c was the Cu 61.48 Hf 18.52 Zr 6.48 Ti1 3.52 alloy, with dc = 6 mm. Thermal parameters were obtained by differential scanning calorimetry and the maximum values for glass transition temperature, T g , (747 K), crystallization temperature, T x , (772 K), solidus temperature, T m , (1152 K) and liquidus temperature, T l , (1230 K) corresponded to the Cu 61.48 Hf 18.52 Zr 6.48 Ti1 3.52 composition. The results also showed that the parameters obtained from thermal analysis did not correlate with the GFA obtained. However, a good correlation of GFA and d c was found by means of the topological model, where the highest % packing efficiency (53.57 %) was found for the Cu 61.48 Hf 18.52 Zr 6.48 Ti 13.52 alloy, which also showed the highest d c value with 6 mm.

show abstract

Metallic glass formation in the binary Cu–Hf system

Cited by 14 publications

References 20 publications

On the origin of bulk glass forming ability in Cu-Hf, Zr alloys

On the origin of bulk glass forming ability in Cu-Hf, Zr alloys

Spectral descriptors for bulk metallic glasses based on the thermodynamics of competing crystalline phases

Glass Formation of Null-Matrix Cu-Hf-(Zr, Ti) Alloys

Contact Info

Product

Resources

About