The thermodynamic re-assessment of the Cu–Zr system

Wang, Na; Li, Changrong; Du, Zhenmin; Wang, Fuming; Zhang, Weijing

doi:10.1016/j.calphad.2006.06.002

Cited by 69 publications

(44 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The glass transition and the crystallization are observable by the respective endothermic and exothermic heat flow events. The endothermic peak at T = 1005 K for x = 40-55 at.% Cu corresponds to the transformation into the high temperature phase CuZr in accordance with the phase diagram [30]. The composition dependence of the glass transition temperature T g and the crystallization temperature T x is shown in Fig.…”

Section: Resultssupporting

confidence: 60%

Structural behavior of CuxZr100−x metallic glass (x=35−70)

Mattern

Schöps

Kühn

et al. 2008

Journal of Non-Crystalline Solids

191

View full text Add to dashboard Cite

The structural behavior of rapidly quenched amorphous Cu x Zr 100Àx alloys was investigated in a wide composition range between 35 and 70 at.% Cu content. High-energy X-ray diffraction patterns, atomic pair correlation functions, mass density and the thermal stability behavior of the alloys all exhibit monotonic changes with composition. Partial pair correlation functions were determined assuming that they remain unchanged in the different amorphous Cu x Zr 100Àx alloys and only the weight fractions become altered with changes in composition. The experimental results can be well described by a solid solution-like replacement of Cu and Zr atoms in the whole composition range. No indications are observed neither for the existence of a special atomic arrangement at a particular chemical composition nor for the presence of phase separation in the glassy state of the binary Cu-Zr system.

show abstract

Section: Resultssupporting

confidence: 60%

Structural behavior of CuxZr100−x metallic glass (x=35−70)

Mattern

Schöps

Kühn

et al. 2008

Journal of Non-Crystalline Solids

191

View full text Add to dashboard Cite

show abstract

“…Despite of contradictory data, the Cu 2 Zr compound was included as one of the possible phase for the thermodynamic assessment of phase diagram of the Cu-Zr system 82 . The results of the assessments show the stability range of the compound similar to those obtained experimentally in Ref.…”

Section: Local Orientational Ordermentioning

confidence: 99%

Cooling rate dependence of simulated Cu64.5Zr35.5 metallic glass structure

Ryltsev

Klumov

Chtchelkatchev

et al. 2016

The Journal of Chemical Physics

View full text Add to dashboard Cite

Using molecular dynamics simulations with embedded atom model potential, we study structural evolution of Cu64.5Zr35.5 alloy during the cooling in a wide range of cooling rates γ ∈ (1.5 · 10 9 , 10 13 ) K/s. Investigating short-and medium-range order, we show that structure of Cu64.5Zr35.5 metallic glass essentially depends on cooling rate. In particular, a decrease of the cooling rate leads to a increase of abundances of both the icosahedral-like clusters and Frank-Kasper Z16 polyhedra. The amounts of these clusters in the glassy state drastically increase at the γmin = 1.5 · 10 9 K/s. Analysing the structure of the glass at γmin, we observe the formation of nano-sized crystalline grain of Cu2Zr intermetallic compound with the structure of Cu2Mg Laves phase. The structure of this compound is isomorphous with that for Cu5Zr intermetallic compound. Both crystal lattices consist of two type of clusters: Cu-centered 13-atom icosahedral-like cluster and Zr-centered 17-atom Frank-Kasper polyhedron Z16. That suggests the same structural motifs for the metallic glass and intermetallic compounds and explains the drastic increase of the abundances of these clusters observed at γmin.

show abstract

“…[11] It is worth noting that the existence of a Cu 5 Zr 8 phase is considered in ref. [11] but it is difficult to observe on heating.…”

Section: Resultsmentioning

confidence: 99%

“…[11] It is worth noting that the existence of a Cu 5 Zr 8 phase is considered in ref. [11] but it is difficult to observe on heating. Neglecting the occurrence of the Cu 5 Zr 8 phase, an eutectoidic transformation from Cu 10 Zr 7 and CuZr 2 into cubic CuZr is predicted at 712°C, in good agreement with the position of the endothermic peak observed by HTDSC (Fig.…”

Section: Resultsmentioning

confidence: 99%

Analysis of Melting and Solidification Behaviour of Glass‐forming Alloys by Synchrotron Radiation

Başer¹,

Boström²,

Stoica³

et al. 2007

Adv Eng Mater

View full text Add to dashboard Cite

It is known that bulk metallic glasses (BMGs) combine high strength with high corrosion resistance properties, which cannot be obtained from corresponding crystalline alloys. Fe-based metallic glasses have been studied widely during the last decade as an emerging engineering material. [1] It is mentioned that a small addition of large atoms, such as Y to a base alloy, is very helpful in terms of glass formation. [2] Y played the role of oxygen scavenger in Fe-Cr-Mo-C-B alloys, leading to the suppression of heterogeneous nucleation and improving glass formability. [3] Glass formation in Fe-based alloy with Y addition is also favored thermodynamically, resulting in an evident enhancement of glass froming ability (GFA), leading the alloy composition close to eutectic point. [4] Cu-Zr binary alloys form bulk metallic glasses with high strength and good ductility. [5] Amorphous phases have been prepared in a composition range around the equiatomic Cu 50 Zr 50 composition. The occurence of eutectic melting seems to promote glass-formation, even if a competitive growth between a primary dendritic phase and an eutectic microstructure may lead to off-eutectic glass-forming compositions. [6] Glass-formation in metallic systems is obtained if a suitable undercooling of the liquid alloy is obtained during the casting. This process is strongly related to the nucleation frequency of crystalline phases, which defines the phase selection during solidification. So, an in-situ analysis of melting and solidification of glass-forming alloys is desirable for an optimisation of processing parameters. In this paper, we investigated melting and solidification behaviour of Fe 48 Cr 15 -Mo 14 Y 2 C 15 B 6 and Cu 50 Zr 50 alloys by in-situ X-ray diffraction analysis obtained by synchrotron radiation at the European Synchrotron Radiation Facility (ESRF). In order to understand melting and solidification behaviour, the alloys have been analysed by high temperature differential scanning calorimetry (HTDSC). The phase mixtures were identified during melting and solidification in order to obtain information on phase selection during casting. ExperimentalMaster alloys (Fe 48 Cr 15 Mo 14 Y 2 C 15 B 6 and Cu 50 Zr 50 ) were prepared from pure elements by arc melting furnace under Ar atmosphere. Each ingot was melted several times in order to obtain a good homogeneity.Thermal analysis was performed using a Setaram HTDSC. The sample was contained in an alumina pan with some alumina powder, in order to prevent the sticking of the liquid alloy to the crucible walls. For high temperature measurements, the calorimetric cell was evacuated and purged several times before measuring under flowing He. Calibration of the instrument has been performed from the melting temperature and heat of fusion of pure metals (Al, Ag, Au, Fe, Cu, Ni).

show abstract

The thermodynamic re-assessment of the Cu–Zr system

Cited by 69 publications

References 26 publications

Structural behavior of CuxZr100−x metallic glass (x=35−70)

Structural behavior of CuxZr100−x metallic glass (x=35−70)

Cooling rate dependence of simulated Cu64.5Zr35.5 metallic glass structure

Analysis of Melting and Solidification Behaviour of Glass‐forming Alloys by Synchrotron Radiation

Contact Info

Product

Resources

About