Metallic Glasses

Cahn, Robert W.

doi:10.1002/9783527603978.mst0098

Cited by 3 publications

(4 citation statements)

References 174 publications

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“…These parameters similarly show no meaningful effect on T x /T l and c (Figs. [12][13][14][15]. Since these two parameters are inversely proportional to T l , decreasing T l leads to a slight increase in T x /T l and c, as expected (Fig.…”

Section: Combined Influence Of Radius Ratio Solute Atom Fraction and ...supporting

confidence: 79%

“…There are essentially no metallic glasses with R<1 (Ti-Pt and Te-Al are exceptions), in agreement with the long held empirical observation that a radius ratio difference greater than 12% is needed for good GFA. [12][13][14][15][16] The dashed line in Fig. 5 indicates the boundary between solute lean and solute rich glasses ( -S a ~4).…”

Section: Solute Atom Fraction and Solute To Solvent Radius Ratio In B...mentioning

confidence: 99%

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An assessment of binary metallic glasses: correlations between structure, glass forming ability and stability

Miracle¹,

Louzguine-Luzgin²,

Louzguina-Luzgina³

et al. 2010

International Materials Reviews

130

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This manuscript explores the influence of atomic structure on glass forming ability and thermal stability in binary metallic glasses. A critical assessment gives literature data for 628 alloys from 175 binary glass systems. The atomic structure is quantified for each alloy using the efficient cluster packing model. Comparison of atomic structure with amorphous thickness and thermal stability gives the following major results. Binary glasses show a strong preference for discrete solute to solvent atomic radius ratios R*, which give efficient local atomic packing. Of 15 possible R* values, only five are common and only four represent the most stable glasses. The most stable binary glasses are also typically solute rich, with enough solute atoms to fill all the solute sites and roughly one-third of the solvent sites. This suggests that antisite defects, where solutes occupy solvent atom sites, are important in the glass forming ability of the most stable glasses. This stabilising effect results from an increase in the number of more stable solute-solvent bonds in solute rich glasses. Solute rich glasses also enable efficient global atomic packing. Together, these structural constraints represent only a narrow range of topologies and thus give a useful predictive tool for the exploration and discovery of new binary bulk metallic glasses (BMGs).

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Section: Combined Influence Of Radius Ratio Solute Atom Fraction and ...supporting

confidence: 79%

Section: Solute Atom Fraction and Solute To Solvent Radius Ratio In B...mentioning

confidence: 99%

An assessment of binary metallic glasses: correlations between structure, glass forming ability and stability

Miracle¹,

Louzguine-Luzgin²,

Louzguina-Luzgina³

et al. 2010

International Materials Reviews

130

View full text Add to dashboard Cite

show abstract

“…The sub-grains can absorb more surrounding dislocations without long-range migration at high temperatures. The recrystallization nucleus are formed when the sub-grains begin to grow up, which agrees with the sub-grain nucleation mechanism proposed by Cahn [20]. When the recrystallized grains are growing, the temperature in the center of ASB cools sharply which prevents the grains from Fracture surface observations.…”

Section: Resultssupporting

confidence: 86%

Dynamic Deformation Response of G33 Steel under High Temperature

Zhang

Cai

Xing

et al. 2015

AMM

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The high temperature deformation and fracture behavior of ultra-high strength G33 steel under high strain rate compression are investigated by means of a split Hopkinson p ressure bar. Impact tests are performed at strain rates of 1000/s and 2200/s and at temperatures ranging from 25°C to 700°C. The SEM and TEM techniques are also used to analyze the microstructure evolution of the adiabatic shear band (ASB) and fracture characteristics of the deformed specimens at high temperature. The experimental results indicate that the flow stress of G33 steel is significantly dependent on temperatures and strain rates. The flow stress of G33 steel increases with the increase of strain rates, but decreases with the increase of temperatures. The strain rate sensitivity is more pronounced at the low temperature of 25°C. In addition, G33 steel is more liable to fracture at high temperatures than at 25°C. Observations of microstructure show two well-developed symmetric parabolic adiabatic shear bands on the longitudinal cross-section of the cylindrical specimen deformed at the temperature of 700°C and at the strain rate of 2200/s. Within the ASB, the width of the fine equiaxed grain structure is about 7μm. The size of those equiaxed grains is approximately 100nm. The fracture analysis results indicate that the ASBs are the predominant deformation and the specimens fracture along adiabatic shear bands. The fracture surfaces of the deformed G33 steel specimens are characterized by two alternating zones: rough dimple zone and relatively smooth shear zone. Further observations reveal that smooth shear zones consist of severely sheared dimples.

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“…It is generally known that a number of metallic glasses have excellent corrosion resistance in a variety of chemical environments [1]. Some work has been done in surface amorphisation using laser surface techniques [2], and the corrosion behaviour of the coating material was studied [3,4].…”

Section: Introductionmentioning

confidence: 99%

Ni Content Surface Layer Produced by Laser Surface Treatment on Amorphisable Cu Base Alloy

Svéda

Janovszky

Tomolya

et al. 2010

MSF

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The aim of our research was to comparatively examine Ni content surface layers on amorphisable Cu base alloy produced by different laser surface treatments. Laser surface treatment (LST) techniques, such as laser surface melting, laser alloying and laser cladding, provide a wide range of interesting solutions for the production of wear and corrosion resistant surfaces. [1,2] With LST techniques, the surface can be: i) coated with a layer of another material by laser cladding, ii) the composition of the matrix can be modified by laser alloying. [3] Two kinds of laser surface treatment technologies were used. In the case of coating-melting technology a Ni content surface layer was first developed by galvanization, and then the Ni content layer was melted together with the matrix. In the case of powder blowing technology Ni3Al powder was blown into the layer melted by laser beam and Argon gas. LST was performed using an impulse mode Nd:YAG laser. The laser power and the interaction time were 2 kW and 20÷60 ms. The characterization of the surface layer microstructure was performed by XRD, scanning electron microscopy and microhardness measurements.

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Metallic Glasses

Cited by 3 publications

References 174 publications

An assessment of binary metallic glasses: correlations between structure, glass forming ability and stability

An assessment of binary metallic glasses: correlations between structure, glass forming ability and stability

Dynamic Deformation Response of G33 Steel under High Temperature

Ni Content Surface Layer Produced by Laser Surface Treatment on Amorphisable Cu Base Alloy

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